Indoor AirPlus Verification Requirements Version 2


SEPA

United States
Environmental Protection
Agency

Indoor AirPlusVerification Requirements

VERSION 2

July 2024

www.epa.gov/indoorairplus

Indoor Air Quality (IAQ)

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Contents

TermsTo Help NavigateThis Document 2

Indoor AirPlus Version 2 Verification Requirements Verification Checklist 3

Guidance for Completing the Indoor AirPlus Verification Checklist 8

Indoor AirPlus Verification Requirements 9

1. Moisture Control 9

2. Radon 14

3. Pest Prevention 16

4. Heating, Cooling, and Ventilation Systems 17

5. Pollutant Control 28

6. Building Materials 30

7. Occupant Education 32

Abbreviations and Acronyms 33

References 34

Climate Zones of the Continental United States 37

NOTE: Although these measures are designed to help improve IAQ in residences compared with residences built to minimum code, they a lone
cannot prevent all IAQ problems. For example, occupant behavior such as smoking/vaping indoors, routine cleaning practices, r egular
maintenance of mechanical systems, and the conscientious use of mechanical equipment during unusual events (e.g., power outag es,
wildfires, etc.) are also important factors that impact IAQ.

TermsTo Help NavigateThis Document

ADVISORIES provide additional information to be considered or recommendations that are not program requirements. Recommendations in some
advisories may become requirements in a future revision or version. While not identified as Advisories, Items distinguished as GOLD are also
recommended for the CERTIFIED tier, though they are not required at this time.

EXCEPTIONS to the requirements described in these construction specifications are noted as appropriate. For climate exceptions, refer to the 2021
International Energy Conservation Code (IECC) CI i mate Zone map (Figure R301.1). Climate Zone names may include a number for the temperature zone
and a letter for the moisture zone (e.g.. Zone 3C refers to coastal California only).

NOTES provide additional information to clarify specification requirements.

NEWLY INSTALLED refers to a component, appliance, equipment, and/or finish that is added to the building or an assembly during construction or
renovation.

COMMON SPACE refers to any spaces in the building being labeled that serve a function in support of the residential part of the building that is not
part of a dwelling or sleeping unit.This includes spaces used by residents, such as corridors, stairs, lobbies, laundry rooms, exercise rooms, residential
recreation rooms, and dining halls, as well as offices and other spaces used by building management, administration, or maintenance in support of the
residents. Common space does not include commercial space. Commercial space is not in the scope of the Indoor AirPlus Certification program.

MULTIFAMILY in the context of the Indoor AirPlus program requirements describes a building with three or more dwelling or sleeping units (e.g., an
apartment building, a multi-unit building without common space). It does not include a row or group of townhouses.

Indoor AirPlus Verification Requirements, Version 2 (July 2024)

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Indoor AirPlusVersion 2 Verification Requirements

Verification Checklist 0MB Control Number 2060-NEW

Approval Expires: Pending Approval

(Refer to full In door AirPlus Verification Requirements for details)

Location Information:

Home/Buildinq Address: City:

State:

Zip Code:

Property/Development Name:

Number of Units (Multifamily Only):

Multifamily Units to Which This Checklist Applies:

Indoor AirPlus Tier (select one): ~ Certified ~ Gold

~ New Construction

Climate Zone (0-7): Moisture Zone (A-C):

~ Gut Rehabilitation

EPA Radon Zone (1-3):

~ Certifying as ENERGY STAR

~ Sampling Protocol Used (Multifamily Only)

Builder Responsibilities:

• It is the exclusive responsibility of builders to ensure that each certified home is constructed to meet the Indoor AirPlus requirements identified as
"Builder Responsibility".

• While builders are not required to maintain documentation demonstrating compliance for each individual certified home, builders are required to
develop a process to ensure compliance for each certified home (e.g., incorporate these requirements into the Scope of Work for sub-
contractors, require a site supervisor to inspect each home for these requirements, and/or sub-contractthe verification of these requirements to
a Verifier).

• Builders are required to review these Items with a representative of the Verification Organization and attest to their compliance at least once per
development/community using the IAP Builder Responsibilities form.

• In the event that the EPA determines that a certified home was constructed without meeting these requirements, the home may be decertified.

~ Verifier has received signed Builder Responsibilities document from Builder

Section 1 - Moisture Control

Must
Correct

Verified

N/A

Water-Managed Site and Foundation

1.1.1 Impermeable surfaces sloped a 0.25 in. per ft. away from the building.

Builder Responsibility

1.1

1.1.2 Newlv installed backfill tamoed and final arade slooed a 0.5 in. oer ft.

Exception: Swales/drains Professional verified soils Graded after settling

Builder Responsibility

1.2.1 Newlv installed foundations, drain tile or CFDS is installed to discharne outside.
Exceptions: Professional verified Group I soils

Builder Responsibility

1.2

1.2.2 Sump cover is mechanically attached.

Builder Responsibility

1.2.3 Sump drainage discharges a 5 ft. from the foundation or into approved stormwater system.
Exception: Discharge professionally designed or verified Group I Soils

Builder Responsibility

1.3

1.3.1 In lowest area of basement or crawlspace, install floor drain with trap seal OR moisture monitoring
system with audible alarm.

1.4.1 Under newlv installed slabs, aaareaate OR sand with aeotextile mattina is installed.
Exceptions: Professional verified Group I Soils

Builder Responsibility

1.4.2 Under newlv installed slabs. Class A or Class B vapor retarder is installed.

Builder Responsibility

1.4

1.4.3 Crawlspaces without slabs, Class A vapor retarder installed with penetrations/seams/edges
overlapped and sealed.

Builder Responsibility

1.4.4 Fxistinn slabs in Moist (A) 7ones where Items 1.4.1 and 1.4.2 cannot be confirmed, a

continuous/sealed Class I vapor retarder installed on top of slab. For occupiable spaces, vapor retarder
is either a durable floor surface or covered by one.

Builder Responsibility

1.4.5 Capillarv break installed between the foundation wall (or slab) and newly installed sill plates.

Builder Responsibility

1.4.6 GOLD: Capillary break installed under or on top of all newly installed concrete footers.

1.5

1.5.1 Newlv installed below-arade concrete/masonrv walls damp-proofed: wood framed walls waterproofed.

Builder Responsibility

Water-Managed Wall Assemblies

1.6

1.6.1 Continuous water-resistive barrier installed behind cladding and a bond-break drainage plane for non-
structural masonry assemblies.

Builder Responsibility

1.6.2 Flashing/drainage system at all horizontal interruptions and bottom of exterior walls.

Builder Responsibility

1.6.3 Weep holes for masonry veneer and/or weep screed for stucco cladding.

Builder Responsibility

1.7

1.7.1 Newly installed windows and doors fullv flashed.

Builder Responsibility

Water-Managed Roof Assemblies

1.8

1.8.1 Gutter system discharges a 5 ft. from foundation, into underground catchment, or sewer/rainwater
management system.

Exceptions: Slab-on-grade ¦ Dry (B) Climates l Professional verified soils l Rock bed
w/liner ¦ Rainwater harvesting system Continuous rubber membrane Waterproofed
foundation walls

Builder Responsibility

1.9

1.9.1 Newlv installed roof-to-wall intersections and roof penetrations fullv flashed.

Builder Responsibility

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1.9.2 Newlv installed roofina includes kickout flashina installed at low end of roof-to-wall intersections and
roof deck flashing integrated with drainage plane.

Builder Responsibility

1.10

1.1 0.1 Newlv installed roofinn includes self-adherinn bituminous membrane at vallevs and roof nenetrations.
Exception: 2021 IRC Section R905 option(s)

Builder Responsibility

1.10.2 Newlv installed low slooed or flat roofs are slooed a 0.25 in. oer ft. to drains or scuooers and drains

are insulated through roof assembly; roof assembly air control layers fully connected to wall air control
layers and water control layers overlap.

Builder Responsibility

1.11

1.11.1 Newlv installed roofina. CZ 4 and ud. include ice barrier in accordance with 2021 IRC R905.1.2.
Exception: Gut rehabilitation with R-49 Grade I attic insulation, if vented.

Builder Responsibility

1.11.2 Gaps and penetrations between vented attics and conditioned spaces are sealed.

Builder Responsibility

Interior Moisture Management

1.12

1.12.1 Moisture-resistant backing material behind tub and shower enclosures with tile or panel assemblies.

Builder Responsibility

1.13

1.13.1 Condensate-producing HVAC equipment provided with corrosion-resistant drain pan and backflow
prevention valve (where applicable).

Exception: ~ Secondary drain system for equipment meets 2021 IMC 307.2.3.

~

~

~

1.13.2 For tank type hot water heater/storage where leakage could cause damage, drain pan and drain OR on
an impervious surface with drain OR detection system with shutoff included.

~

~

~

1.13.3 Non-vented clothes dryers plumbed to a drain.

~

~

~

1.14

1.14.1 Supply water pipes in exterior building cavities insulated with a R4 pipe wrap.

Exceptions: ~ CZ 1-3 in Dry (B) Zone ~ Cavity insulation qualifies as air barrier

~

~

~

1.15

1.15.1 Water-resistant flooring installed where moisture or splash damage could occur.

~

~

-

1.16

1.16.1 No Class I vapor retarders on interior side of vapor permeable insulation in below-grade, exterior walls.

~

~

~

1.16.2 In Warm Humid counties, no Class I vapor retarders on the interior side of vapor permeable insulation
in above-grade exterior walls.

~

~

~

1.17

1.17.1 Interior envelope inspection: moisture intrusion, leaks, and mold are not evident, or source is identified
and remedied (gut rehabs only).

~

~

~

1.17.2 Exterior inspection: above-grade surfaces are free from degradation and potential moisture intrusion,
or source is identified and remedied.

~

~

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Section 2 - Radon

Must
Correct

Verified

N/A

Where one of the following exceptions are applied, check the applicable box and check "N/A" for Items 2.1-2.2:

~	Raised-pier foundation w / no conditioned ground contact.

~	Building is over garage compliant with ANSI/ASHRAE 62.1 -2022, Sections 5.2 and 6.5.

2.1

Mitigation system installed (if applicable): ~ Active system ~ Passive system ~ N/A
Final radon test result (if applicable): (pCi/l)

2.1.1 In EPA Radon Zone 1, construct buildings with either an active radon mitigation system OR a passive
system and a radon test upon completion.

~

~

~

2.1.2 In EPA Radon Zone 2, either construct buildings with a passive radon reduction system OR conduct a
radon test upon completion.

~

~

~

2.1.3 In EPA Radon Zone 3. provide occupants in 1 -2 familv dwellinas w/ EPA's Basic Radon Facts.

Builder Responsibility

2.2

Where an active or passive radon system is installed, the following features are included:

2.2.1.1 Capillary break and vapor retarder installed according to Specification Items 1.4.1 through 1.4.4.

Builder Responsibility

2.2.1.2 Vent pipe clearly labeled, connected to an open T-fitting with 10 ft. (min.) horizontal pipe under vapor
retarder, terminating outdoors a minimum of 12 in. above the roof. No suction points on sump lids.

Builder Responsibility

2.2.1.3 Foundation drainage system that discharges to daylight and is connected to soil gas collection
plenum has backwater valve installed.

Builder Responsibility

2.2.1.4 Radon fan (if active) OR electrical receptacle (if passive) installed outside thermal and air barrier
boundary, meeting fan location requirements in acceptable exterior location.

~

~

~

2.2.1.5 Branch circuit labeled at electrical panel.

~

~

~

2.2.1.6 Where active system is installed, a system monitoring mechanism is connected to the pipe and
easily observed.

~

~

~

Section 3 - Pest Barriers

Must
Correct

Verified

N/A

3.1

3.1.1 Exterior penetrations and joints sealed.

~

~

~

3.1.2 Corrosion-proof pest screens installed at openings that cannot be fully sealed.

~

~

~

3.1.3 Corrosion-proof screen, louver, or grille for all ventilation termination fittings.

~

~

~

3.1.4 Dryer ducts include weather-resistant termination or louver.

~

~

~

3.1.5 GOLD: Screens provided for all operable windows.

~

~

~

3.2

3.2.1 Multifamily buildings include a plan or contract for integrated pest management.

~

~

~

3.2.2 Multifamily buildings include resident guidance on housekeeping, refuse removal and reporting pest
problems in owner/tenant manual.

~

~

~

3.2.3 GOLD: Multifamily buildings include sanitary floor drains in common trash/recycling rooms.

~

~

~

Section 4 - Heating, Cooling, and Ventilation Systems

Must
Correct

Verified

N/A

If certifying as ENERGY STAR, Indoor AirPlus requirements shown in italics are satisfied by meeting related ENERGY STAR requirements, and
ENERGY STAR footnotes and exceptions are permitted unless otherwise specified.

Heating and Cooling Design and Inspection

4.1

4.1.1 Newlv installed dwellinn-unit heatinn and coolinn (HAC) svstems meet desinn/documentation
requirements.

~

~

~

Indoor AirPlusVerification Requirements,Version 2 (July 2024)

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4.1.2 Newiv installed common space HAC svstems sized in accordance with ACCA Manual S or equivalent.

~

~

~

4.1.3 Newiv installed HAC documentation (i.e.. start-up. testina! provided to Verifier.

~

~

~

4.1.4 Existing HAC systems assessed/serviced in accordance with ANSI/ACCA Standard 4 or
ANSI/ASH RAE/ACCA Standard 180.

~

~

~

4.2

4.2.1 GOLD: Humidity monitoring provided in the main living area of the dwelling unit is:
~ Integrated with HAC controls OR ~ Standalone hygrometer

Exception for MF: ~ RH monitoring of each dwelling unit by building management platform.

~

~

~

4.2.2 Moist (A) CZ 1 -4: Eauioment installed to maintain RH < 60% in each dwellina unit is:

~	Ventilating or whole-home dehumidifier ~ RH sensor integrated w/ cooling system (s)
Exception for CZ 4A: DRH data can be recorded for 60 days AND one of the following is provided:

~	Dehumidification readiness OR ~ RH modeling

~

~

~

4.2.3 In Moist (A) & Marine (C) Zones, basements and crawlspaces are served by a HAC system with RH
controls per Item 4.2.2 OR provided with a supplemental dehumidification system.

Exception for MF: ~ Unfinished and/or non-occupiable spaces located in basements.

~

~

~

4.3

4.3.1 Newiv installed dweHina-unit duct svstems sizedaccordina to:
~ A CCA Manual D ~ Other (applicable to MF only)

~

~

~

4.3.2 No building cavities used as air supplies or returns.

Exception: ~ Mechanical closets meeting E4.3.2a ~ Cavities/spaces meeting E4.3.2b

~

~

~

4.3.3 Duct boots and visible interior of ducts inspected to be substantially free of dust and debris.

~

~

~

4.3.4 Existing ducts inspected to be dry, with no evidence of mold and without tears/disconnections (gut
rehabs only).

~

~

~

4.3.5 Ducts installed outside thermal and air barrier boundary are sealed at joints, seams, penetrations with
compliant material.

~

~

~

4.3.6 Dwelling-unit ducts tested to meet total duct leakage requirements.

Exceptions: ~ HAC system serves more than one dwelling unit ~ Supply ducts < 10 ft.

~

~

~

4.3.7 Dwelling-unit ducts tested to meet leakage to outdoors requirements.

Exceptions: ~ Air handler and all ducts are within thermal and air barrier boundary
~ Total duct leakage £ 4 CFM25 per 100 sf of CFA or £ 40 CFM25

Exception for MF: ~ Air handler within thermal and air barrier boundary and £ 10 ft. of ducts outside
thermal and air barrier boundary.

~

~

~

4.4

4.4.1 HVAC air-handling equipment and/or ductwork is not located in garages.

~

~

~

4.4.2 HAC supply and return ducts outside the thermal and air barrier boundary are insulated to > R-6.

~

~

~

4.4.3 GOLD: All HAC equipment and ductwork is located within the thermal and air barrier boundary.
Exceptions (check all that apply):

~	Measured total leakage £ 1 CFM25 per 10Osf of CFA.

~	Duct lengths are £ 10 ft.

~	Ducts in vented attic insulated min R-8 and measured leakage to outdoors £ 3 CFM25 per 100 sf of
CFA and encapsulated or buried per E4.4.3c.

~	2021 IECC Section R403.3.2 met.

~	Jump ducts, sealed per Item 4.2 and buried in insulation.

~	Located in uninsulated crawl space or basement meeting Item 4.2.3 dehumidification.

~	Rooftop MUA or DOAS.

~

~

~

4.5

4.5.1 Bedrooms served by ducted HAC systems are ±3 Pa of the main body of the dwelling unit OR ±5 Pa
allowed where bedroom supply airflow >150 CFM.

Exception for MF: ~ Testing not required where bedroom supply airflow <150 CFM.

~

~

~

Mechanical Ventilation

4.6

4.6.1 CERTIFIED: Mechanical ventilation is installed for each dwelling unit.

GOLD: "Balanced" mechanical ventilation system is installed for each dwelling unit.

~

~

-

4.6.2 Ventilation override control is clearly labelled. In one- and two-family dwellings and townhouses,

controls are readily accessible to the occupant. In multifamily buildings, controls are readily accessible
by occupant, building owner, or building maintenance staff.

~

~

-

4.6.3 Air inlets verified to pull air directly from outdoors.

~

~

~

4.6.4 Outdoor air inlets> 2 ft. above grade or roof deck;> 3 ft. from dryer exhausts and contamination

sources exiting the roof;> 5 ft. distance from dwelling-unit bathroom and kitchen exhaust not exiting
the roof; > 10 ft. from all other contamination source exits.

~

~

~

4.6.5 Ventilation is measured and documented in accordance with ANSI/RESNET/ICC Std. 380 and meets
Section 4 of ASHRAE 62.2-2019.

~

~

-

4.6.6.1 For supply or balanced ventilation, prior to distribution, outdoor air passes through a filter rated:
~ MERV 8 or higher (CERTIFIED) ~ MERV 13 or higher (GOLD)

~

~

~

4.6.6.2 Outdoor air filters are accessible for maintenance.

~

~

~

4.6.7 Ventilation fans rated £ 1 sone.

Exception: ~ HAC air handler ~ ERV, HRV, in-line fan ~ Remote-mounted fan with a 4ft. ductwork

~

~

-

4.7

4.7.1 Bathroom ventilation exhausts directly to outdoors meeting ASHRAE 62.2-2019 Section 5.

~

~

~

4.7.2 Bath fans rated £ 3 sones if intermittent and £ 1 sone if continuous.
Exceptions: ~ ERV, HRV, in-line fan ~ Remote-mounted fan

~

~

~

4.7.3 Bath fans integrated with dwelling-unit ventilation have on/off controls labeled.

~

~

~

4.7.4 GOLD: Demand-controlled bath fans include timer or occupancy/humidity sensor.

~

~

~

4.8

4.8.1 Demand-controlled kitchen exhaust is located above the cooktop, vented to outdoors, with Verifier-
measured exhaust airflow ~ a 200 CFM (CERTIFIED) ~ a 300 CFM (GOLD)

Exceptions:

~ MF: Cooktop is electric, recirculation hood has charcoal filter, continuous exhaust rate met.

~

~

~

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~	CERTIFIED only: Microwave-range hood exhaust airflow not measured; meets additional
requirements.

~	CERTIFIED only: Downdraft exhaust fan installed with electric cooktop and a 300 CFM.







4.8.2 If continuous exhaust is present in the kitchen, exhaust grille meets cooking equipment separation
distance and has MERV 3 or washable filter.

~

~

~

4.8.3 Continuous kitchen exhaust rated £ 1 sone at airflow a 25 CFM.

Demand-controlled kitchen exhaust rated £ 2 sone at airflow a 100 CFM.
Exception: ~ ERV, HRV, in-line fan ~ Remote-mounted fan

~

~

~

4.9

4.9.1 Common space ventilation air provided directly from outdoors and inlets meet separation distances.

~

~

~

4.9.2 Common space ventilation and exhaust measured to meet or exceed ASHRAE 62.1-2019.

~

~

~

4.9.3.1 Prior to distribution, common space ventilation outdoor air passes through a filter rated:
~ MERV 8 or higher (CERTIFIED) ~ MERV 13 or higher (GOLD)

~

~

~

4.9.3.2 Outdoor air filter is accessible for maintenance.

~

~

~

4.10

4.10.1 Central vacuum systems exhaust outdoors and a 10 ft. from ventilation air inlets.

~

~

~

4.10.2 Vented clothes dryers exhaust outdoors.

~

~

~

Filtration and Air Cleaning

4.11

4.11.1 At final inspection, ducted HAC systems include clean filters rated:

~	MERV 11 or higher (CERTIFIED) ~ MERV 13 or higher (GOLD)
Exception for dwelling units with portable air cleaners:

~	MERV 8 (CERTIFIED) ~ MERV 11 (GOLD)

~

~

~

4.11.2 HAC return air filters are accessible for cleaning and/or replacement.

~

~

~

4.11.3 Filter access panels are gasketed and/or sealed.

~

~

~

4.11.4 All return air and mechanically supplied outdoor air pass through a filter.

~

~

~

4.11.5 Electronic air cleaners do not generate ozone exceeding concentration limits of 0.005 ppm.

~

~

~

4.11.6 Ozone generators or devices intentionally using ozone not installed.

~

~

-

4.12

4.12.1 GOLD: One of the following filtration methods provided for dwelling units with no ducted HAC
system:

~ MERV 13 or higher ~ Portable air cleaners ~ Transfer fan w/ MERV 13 or higher

~

~

~

4.13

4.13.1 Where gas-phase air cleaning devices are installed, ozone is not intentionally used.

~

~

~

4.14

4.14.1 Where provided, UVGI or other electronic air cleaners (e.g., plasma generators, PCOs, etc.) must not
exceed ozone concentration limits of 0.005ppm.

~

~

~

Section 5 - Pollutant Control

Must
Correct

Verified

N/A

If certifying as ENERGY STAR, Indoor AirPlus requirements shown in italics are satisfied by meeting related ENERGY STAR requirements, and
ENERGY STAR footnotes & exceptions are permitted unless otherwise specified.

5.1

5.1.1 ~ CERTIFIED: Naturally drafted appliances meet max depressurization and exhaust location
requirements.

~ GOLD: Combustion furnaces, boilers, water heaters mechanically drafted or direct-vented.

~

~

~

5.1.2 Fireplaces mechanically drafted or direct-vented.

~

~

~

5.1.2.1 Liquid or gas-burning fireplaces have tempered glass front or gasketed door.

~

~

~

5.1.3 No unvented combustion appliances other than cooktops/ranges/ovens.

~

~

-

5.1.4 Fxistinq chimnevs and flues pass professional I evel II inspection per NFPA 211.

~

~

~

5.1.5 Solid fuel-burning appliances meet the following requirements (check where applicable):

~	site-built masonry fireplaces sealed to prevent use or are retrofitted

~	factory-built wood burning fireplaces have dedicated outdoor air & meet UL 127

~	wood stove/fireplace inserts meet UL 1482 and the EPA's New Source Performance Standards

~	pellet stoves meet ASTM E1509 and the EPA's New Source Performance Standards

~

~

~

5.2

5.2.1 CO detection installed according to 2021 IBC Section 915 or 2021 IRC Section R315.

~

~

~

5.2.2 CO detectors are protected from dust, paint, and contaminants during construction.

~

~

~

5.3

5.3.1 Occupant provided with the EPA's brochure or resource guide on secondhand smoke.

~

~

~

5.3.2 For multifamily buildings, smoking/vaping prohibition is posted in common areas and communicated in
lease agreement.

~

~

~

5.3.3 For multifamily buildings, where provided, designated outdoor smoking/vaping areas located a
minimum of 25 ft. from entries, outdoor air intakes, and operable windows.

~

~

~

5.4

5.4.1 Crawlspaces and basements not vented, and perimeter walls sealed.

~

~

~

5.4.2 Airtightness testing in accordance with ANSI/RESNET/ICC Std. 380 is met:
CERTIFIED: ~ Detached dwelling units > 1,000 ft2, £ 5 ACH50

~All other units £ 0.30 CFM50/sf encl.

GOLD: ~ Detached dwelling units > 1,000 ft2, £ 3 ACH50
~All other units £ 0.25 CFM50/sf encl.

~

~

-

5.5

5.5.1 Assemblies between garages and occupiable spaces are air-sealed and doors are gasketed or
weather-stripped.

~

~

~

5.5.2 One-and two-family dwellings and townhouses with attached private garages:

~	Pressure test conducted to verify effectiveness of garage-to-house air barrier; OR

~	Exhaust fan installed in garage and Verifier-measured airflow a 100 CFM

~

~

~

5.5.3 For multifamily buildings, where an exhaust system is installed in a shared parking garage, system
includes CO and N02 sensors, mee ting minimum continuous ventilation rates.

~

~

~

5.6

5.6.1 No combustible liquid or gas fuels stored within the building's pressure boundary.

~

~

-

5.6.2 Supplemental portable combustion equipment not operated or stored within the building's pressure
boundary.

~

~

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Indoor AirPlusVerification Requirements,Version 2 (July 2024)

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Section 6 - Buildina Materials (newlv installed)

Must
Correct

Verified

N/A

Download the Indoor AirPlus Compliant Building Products guide to help identify compliant products,

6.1

6.1.1 Paints, finishes, and coatings meet VOC emission limits in CDPH Standard Method V1.2-2017.

6.2

6.2.1 Carpet and carpet cushions meet VOC emission limits in CDPH Standard Method V1.2-2017.

6.3

6.3.1 Adhesives and sealants meet VOC emission limits in CDPH Standard Method V1.2-2017.

6.4

6.4.1 Hard surface flooring and underlayment meet VOC emission limits in CDPH Standard Method V1.2-
2017.

6.5

6.5.1 Interior gypsum board and joint compound meet VOC emission limits in CDPH Standard Method V1.2-
2017.

6.6

6.6.1 GOLD: Insulation materials meet VOC emission limits in CDPH Standard Method V1.2-2017.

Section 7 - Occupant Education

Must
Correct

Verified

N/A

7.1

7.1.1 Instruction manuals provided for the followinn newlv installed annliances and svstems.

¦ HAC systems and accessories

¦ Local and dwelling-unit ventilation systems

¦ Kitchen and bath exhaust systems

¦ Air cleaners

¦ Dehumidifiers

¦ Moisture and/or IAQ monitors

¦ Combustion appliances

¦ Sump pumps

¦ Radon systems

Builder Responsibility

7.1.2 Owner-occupied units: O&M recommendations and filter change schedule provided.

Builder Responsibility

The following fields shall be completed in legible print, except for "Initials" which can be signed/initialed either manually or digitally in this
format or through HCO-approved software.

Verifier Organization

Home Certification Organization

Verifier Name

First Inspection Date

Initials

Verifier Name

Final Inspection Date

Initials

This collection of information is approved by OMB under the Paperwork Reduction Act, 44 U.S.C. 3501 etseq. (0MB Control No. 2060-New). Responses to this collection of information are
voluntary (Section 103(a) of the Clean Air Act). An agency may not conduct or sponsor, and a person is not required to respond to, a collection of information unless it displays a currently valid
OMB control number. The public reporting and recordkeeping burden for this collection of information is estimated to .5 hours per response. Send comments on the Agency's need for this
information, the accuracy of the provided burden estimates and any suggested methods for minimizing respondent Burden to the Regulatory Support Division Director, U.S. Environmental
Protection Agency (2821T), 1200 Pennsylvania Ave., NW, Washington, D.C. 20460. Include the OMB control number in any correspondence. Do not send the completed form to this address.

EPA Form No. 5900-668

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Guidance for Completing the Indoor AirPlusVerification Checklist

1. Only homes or multifamily buildings verified to comply with these specifications can earn the Indoor AirPlus certification. See the
Indoor AirPlus National Program Requirements for full descriptions of the certification process; program eligibility; and pa rtnership,
training, and credentialing requirements.

2. Indoor AirPlus requirements are not intended to supersede where local jurisdictions may have more stringent requirements (e.g., duct
leakage allowances).

3. Check one box per line. Check "N/A" for specifications that do not apply for specific conditions (e.g., climate, building type) according
to the exceptions described in the Indoor AirPlus requirements. Items may be verified visually by the Verifier on-site during
construction/rehabilitation, by reviewing photographs taken during construction/rehabilitation, by reviewing material or equi pment
documentation, or through equivalent methods as appropriate. Requirements that refer to existing building elements on ly apply to
features that exist as part of gut rehabilitation.

4. Verification is not complete until this checklist is completed in full and signed/initialed.TheVerifierwho conducted the verification, or
a responsible party from theVerifier's company, mustsign the completed checklist. The Verifier shall coordinate with their
HCO/Designee and/or builder/owner to provide an Indoor AirPlus label and certificate for each qualified home/unit.

5. TheVerifier shall retain the Indoor AirPlus Verification Checklist for the home or multifamily building for a minimum of 3years from
final verification. If a quality assurance review indicates that items have not been successfully completed, theVerifierwill be
responsible for facilitating corrective action.

6. For multifamily buildings, Verifiers are permitted to use a sampling protocol if approved by the HCO and EPA. For multifamily
buildings, only one verification checklist is required, in accordancewith an HCO's approved sampling protocol. However, a completed
and signed checklist must be able to be associated with each IAP certified home/unit. Sampling is permitted for one- and two-family
dwellings and townhouseswith building permit dates (as defined in the Indoor AirPlus National Program Requirements) prior to
01/01/2025. Sampling is not permitted for one- and two-family dwellings or townhouseswith building permit dates on or after
01/01/2025.

For further information on the Indoor AirPlus program.visitwww.epa.gov/iap.

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Indoor AirPlusVerification Requirements
Version 2

ENERGY STAR certification is a pre-requisite for a dwelling unit to achieve Indoor AirPlus Gold Certification. ENERGY STAR checklist
items that satisfy Indoor AirPlus requirements are italicized throughout. Please refer to the ENERGY STAR Residential New Construction
Program website for more information and the full description of the requirements. Items without CERTIFIED or BOLD distinction apply
to both certification schemes. Advisories, Notes, and Exceptions follow the same distinction protocol.

1. Moisture Control

Water-Managed Site and Foundation

1.1 Site Drainage

1.1.1 Impermeable surfaces (e.g., patio, porch, or plaza slabs; sidewalks; ramps; driveways) are sloped > 0.25 in. per ft. away from the
building to the edge of surface, to a swale or drain, or a minimum of 10 ft.

1.1.2 Final grade sloped > 0.5 in. per ft. away from the building either a minimum of 10 ft. OR to a swale or drain. Newlv installed or
disturbed backfill has been tamped.

Exception:

E1.1.2 Tamping of backfill is not required if either:

1. Proper drainage can be achieved using non-settling compact soils, as determined by a certified hydrologist,

soil scientist, or Professional Engineer; OR

ii. The builder has scheduled a site visit to provide in-fill and final grading after settling has occurred.

1.2 Foundation Drainage

1.2.1 For newlv installed foundations, drain tile or Composite Foundation Drainage System (CFDS) is installed at basement and
crawlspace walls and sloped to discharge to outside grade (daylight) or to a sump pump, sewer, or runoff management system.

Notes:

N1,2.1a For drain tile: top of pipe is installed below the bottom of the concrete slab or crawlspace floor; AND pipe is pre-
wrapped with filter fabric or is surrounded with > 6 in. of Vi to % in. washed or clean gravel, with gravel layer fully
wrapped with fabric cloth. Drain tile is level or sloped to discharge to outside grade (daylight) or to a sump pump. If
drain tile is on interior side of footing, then a channel is provided through footing to exterior side.

N1.2.1 b For CFDS: the system must include a soil strip drain or another ICC-ES evaluated perimeter drainage system to be
eligible for use.

Exceptions:

E1.2.1a A foundation drainage system is not required when a certified hydrologist, soil scientist, or Professional Engineer has
determined that the foundation rests on Group I Soils (i.e., well-drained ground or sand-gravel mixtures), as defined by
2021 IRCTable R405.1.

El .2.1 b In buildings undergoing gut-rehabilitation, where an interior drain tile is installed to mitigate moisture intrusion in an
existing foundation, a channel to the exterior through the footing is not required.

1.2.2 Where a sump pit is installed, a sump pump shall be installed per manufacturer's instructions, and sump covers shall be
mechanically attached with full gasket seal or equivalent.

1.2.3 Sump drainage shall be discharged a minimum of 5 ft. from the foundation or into a stormwater system approved by the
authority having jurisdiction.

Exception:

E1.2.3 Discharging a minimum of 5 ft. from the foundation is not required when a certified hydrologist, soil scientist, or

Professional Engineer has designed an alternative management system or determined that the foundation rests on
Group I Soils.

Advisories:

A1.2.3a The point of discharge should be as far away from the building's foundation as practically feasible and discharge piping
should be installed below grade or otherwise protected.

A1.2.3b In CZ 4 and higher for wet sites with deeper foundations, a freeze guard or a similar fitting with integral openings is
recommended where the pipe exits.

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1.3 BulkWater Prevention

1.3.1 In buildings with a basement or crawlspace, a floor drain or moisture monitoring system is installed in the lowest floor area to
mitigate risk from internal bulk water events. Floor drains shall include trap seal protection according to 2021 IRC P3201.2.1.
Sump pits are permitted to have drains integrated with the sump cover, so long as the cover is mechanically attached with a full
gasket seal and the integral drain has a trap or similar means to reduce soil gas entry. A moisture monitoring system shall emit
an audible alarm and/or send notifications via a web-based app when water is detected.

Advisories:

A1.3a Combination foundations (e.g., basement with separated crawlspace) are recommended to have a means of discharging bulk
water from each separate foundation area in the case of interior water events (e.g., plumbing malfunction, flooding, etc.).

A1.3b Any trapped drains, other than floor drains, without trap seal protection that do not receive regular water input should be filled
with mineral oil to reduce the potential for evaporation.

A1,3c Moisture monitoring systems, where installed, should have the ability to shut off water supply in the event of a plumbing
malfunction.

1.4 Capillary Break and Vapor Retarder

1.4.1 Under newlv installed concrete slabs, a capillary break is installed by providing a base of either:

1.4.1.1 A 4 in. (min.) layer of 0.5 in. diameter or greater clean aggregate: OR

1.4.1.2 Continuous geotextile drainage matting installed according to the manufacturer's instructions.

Exception:

E1.4.1 Buildings built on free-draining soils are recommended, but not required, to meet the above capillary break

requirements. Free-draining soils are identified as Group I (Table R405.1, 2021 IRC) by a certified hydrologist, soil
scientist, or Professional Engineer through a site visit.

1.4.2 Under newlv installed concrete slabs, a Class A or Class B vapor retarder as defined by ASTM E1745, is installed in direct
contact with the concrete slab by overlapping seams and/or sealing joints and penetrations.

Advisory:

A1.4.2 The EPA recommends a vapor retarder meeting ASTM E1745 Class A with minimum 10-mil thickness.

1.4.3 For crawlspaces without concrete slabs, a Class A vapor retarder as defined by ASTM E1745, is installed by sealing or
taping all seams and penetrations and sealing to walls and piers (e.g., with adhesive and furring strips or similar mechanical
fasteners and sealant).

Advisory:

A1.4.3 Prior to installing the vapor retarder, prepare the ground by leveling and removing obstructions capable of causing tears
or punctures.

1.4.4 For existing slabs located in Moist (A) Zones, where the presence of a capillary break (Item 1.4.1) and below slab vapor retarder
(Item 1.4.2) cannot be visually verified, a continuous and sealed Class I vapor retarder is installed on top of the slab. In such
cases, up to 10% of the slab surface may be exempted from this requirement (e.g., for the bottom plates in walls). In addition,
for existing slabs in occupiable space, the vapor retarder shall also be a durable floor surface or covered by a durable floor
surface.

1.4.5 A continuous capillary break is installed between the foundation wall (or slab) and newlv installed sill plates.

1.4.6 GOLD Capillary break installed under or on top of all newly installed concrete footers using either 6 mil (or thicker) polyethylene
sheeting, bituminous membrane, or liquid waterproofing.

Note:

N1.4.6 A capillary break can be achieved at the footer by encapsulating the entire stem wall with bituminous membrane
wrapping from the exterior, over the sill, and down the interior of the stem wall.

Exception:

E1.4 Unheated storage areas of less than 70 sq. ft., garages, and utility areas are not subject to the requirements under Item 1.4.

1.5 Damp-Proofing and Waterproofing Below-Grade Exterior Walls

1.5.1 Exterior surface of below-grade walls of basements and unvented crawlspaces finished as follows:

1.5.1.1 For poured concrete, masonry, and insulated concrete forms, finish with damp-proofing coating.

1.5.1.2 For wood framed walls, finish with polyethylene and adhesive or other equivalent waterproofing.

Exception:

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E1.5.1 Interior surface of an existing beiow-grade wall listed in 1.5.1.1 (e.g., in a home undergoing a gut rehab) is permitted to
be finished by:

E1,5.1a Installing a continuous and sealed drainage plane, capillary break, Class I Vapor Retarder and air barrier that
terminates into a foundation drainage system as specified in Item 1.2; OR

E1.5.1 b If a drain tile is not required as specified in Item 1.2, adhering a capillary break and Class I Vapor Retarder
directly to the wall with the edges taped/sealed to make it continuous. Note that no alternative compliance
option is provided for existing below-grade wood-framed walls in Item 1.5.1.2.

Water-Managed Wall Assemblies

1.6 Drainage Plane and Flashing

1.6.1 A continuous Water-Resistive Barrier (WRB) is installed behind exterior wall cladding that overlaps flashing and is fully sealed at
all penetrations. Behind all stucco and non-structural masonry cladding wall assemblies, an additional bond-break drainage plane
is provided between WRB and cladding.

1.6.2 Flashing or an equivalent drainage mechanism is installed at all horizontal interruptions and the bottom of exterior walls to direct
water away from the WRB and foundation.

1.6.3 Weep holes for masonry veneer and weep screed for stucco cladding systems are included, per manufacturer specifications.
Advisories:

A1.6a Liquid or fluid applied membranes and integrated sheathing systems with sealed/taped seams should be applied and/or sealed
on clean surfaces and according to manufacturer's instructions to perform as a WRB.

A1.6b Rainscreen assemblies with a minimum of 0.5 in. air space or drainage mat are recommended between the cladding and
drainage plane.

1.7 Exterior Window and Door Openings

1.7.1 Newlv installed windows and doors must be fully flashed. Apply a formed pan, flexible tape, or liquid applied pan flashing from
the interior edge of sill framing, terminating over the front edge of framing and WRB and covering the sill corners, to direct the
movement of water away from the opening and wall assembly. Install side flashing that extends over pan flashing and top
flashing that extends over side flashing, or equivalent details for structural masonry or structural concrete walls.

Advisories:

A1.7.1a Where flexible tape or liquid applied pan flashing is utilized to form a pan, a pitched sill is recommended.

A1.7.1 b When selecting new fenestration, the ANSI/NFRC 500-2020 Condensation Index (CI) should be used to limit surface
condensation based on the local design temperature, Relative Flumidity (RFH), and the dew point.

Water-Managed Roof Assemblies

1.8 Gutters, Downspouts, and Roof Water Drainage

1.8.1 Direct roof water away from the building using gutters, downspouts, and lateral piping or other non-porous diverters that
discharge either:

1.8.1.1 A minimum of 5 ft. from foundation on a sloping finish grade, OR

1.8.1.2 Into an underground catchment system not connected to the foundation drain system that discharges water > 10 ft.
from foundation, OR

1.8.1.3 Into an approved sewer or rainwater management system.

Exceptions:

E1.8.1a Buildings with slab-on-grade foundations.

E1.8.1 b Buildings in Dry (B) climates as shown in 2021 IECC Figure R301.1 andTable R301.1.

E1.8.1c Building sites with no expansive or collapsible soils, as determined by a certified hydrologist, soil scientist, or
Professional Engineer.

E1,8.1d A roof design that deposits rainwater to a grade-level rock bed with a waterproof liner and a lateral drain pipe that
meets the above discharge requirements.

E1.8.1e A rainwater harvesting system that drains overflow to meet the above discharge requirements.

E1.8.1 f A continuous rubber membrane (e.g., EPDM) aligned with the foundation wall from final grade to > 8 in. below grade
and sloping > 0.5 in. per ft. away from the building for at least 5 ft., with Group I Soils (as defined by 2021 IRCTable
R405.1), covering the membrane to within 3 in. of final grade.

E1.8.1g Buildings with concrete and masonry foundation waterproofing installed in accordance with 2021 IRC Section R406.2.

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1.9 Roof to Wall Intersections and Roof Penetrations

1.9.1 Fully flash all newlv installed roof-to-wall intersections and all newlv installed roof penetrations using step flashing for
conventional roofs or continuous flashing for metal and rubber membrane roofs.

1.9.2 Install kickout flashing at the low end of newlv installed roof-to-wall intersections. Flashing shall extend at least 4 in. on the wall
surface above the roof deck and shall be integrated with drainage plane above. Intersecting wall siding shall terminate a
minimum of 1 in. above roof, or higher per manufacturer's recommendations.

1.10 Roof Valleys and Decking

1.10.1 Newlv installed roofing includes a self-adhering polymer-modified bituminous membrane or the equivalent at all valleys and roof
decking penetrations.

Exceptions:

E1.10.1a Any valley flashing option in 2021 IRC Section R905, according to the appropriate roof covering, is permitted.

1.10.2 Newlv installed low sloped or flat roofs (<2:12 pitch) shall meet the following criteria:

1.10.2.1 Sloped to drains or scuppers at a minimum 0.25 in. per ft.

1.10.2.2 Roof drains insulated through roof assembly to reduce the possibility of condensation.

Advisory:

A1.10.2.2 The EPA recommends installing 3 in. of vapor impermeable insulation (i.e., ccSPF) for a length (vertical
and/or horizontal) of 3 ft. from the drain penetration at the roof deck.

1.10.2.3 Roof assembly air control layer must be connected over other roof elements (e.g., curbs and blocking) and connected
to the wall air control layer.

1.10.2.4 Materials that form the water control layer must overlap each other in shingle fashion or be sealed in a watertight
manner.

1.11 Ice Dam Prevention

1.11.1 In 2021 IECC Climate Zones 4 & higher, for all newlv installed roofing, extend a self-sealing bituminous membrane (or equivalent
ice barrier) in accordance with 2021 IRC R905.1.2.

Exception:

E1.11.1 For gut rehabilitations in 2021 IECC Climate Zones 4 & higher, where ice flashing per Item 1.11.1 cannot be verified
under existing roofing in homes with vented attics, install insulation to meet or exceed R-49 (or equivalent U-factor).
Ensure Grade I insulation per ANSI/RESNET/ICC 301 -2022 installed throughout and terminates at the interior face of
the exterior wall below.

Advisory:

A1.11.1a The EPA recommends installing roof membrane prior to the drip edge installation and lapped down minimum of 1 in.

onto the face of the fascia. After installation of the membrane and drip edge, install an additional self-sealing strip at
least 4 in. wide on top of the drip edge.

A1.11.1b For attics vented at the eaves, wind baffles are installed in every rafter cavity that extend up the roofline from the

outside edge of the exterior wall and terminate inside the attic above the level of the insulation. Either the baffle, or
other blocking type, shall fully block the vertical edge of the insulation between the width of the bay from the vented
eave to prevent wind washing.

1.11.2 Gaps and penetrations between vented attics and the conditioned spaces are substantially sealed (e.g., tops of balloon-framed
cavities, chases, wiring and plumbing penetrations, top plates, etc.).

Interior Moisture Management

1.12 Moisture-Resistant Backing Materials

1.12.1 Where installed, backers for wall tile and wall panels in tub and shower enclosures shall be cement board complying with ASTM
C1288 or ISO 8336, Category C, or equivalent moisture-resistant material. Paper-faced backerboard shall not be used.

Note:

N1.12.1 In addition to fiber-cement board, fiber-mat reinforced cementitious panels complying with ASTM C1325; glass mat

water-resistant gypsum panels complying with ASTM C1178; water-resistant fiber-reinforced gypsum panels complying
with Section 6 of ASTM C1278; or materials that have been evaluated by ICC-ES per AC 115 may also be used to meet
this requirement. Paper-faced backerboard may only be used behind monolithic enclosures or waterproof membranes
that have been evaluated by ICC-ES per AC 115, and then only if it has received a rating of 10when tested in
accordance with ASTM D3273.

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1.13 Appliance Drainage

1.13.1 For each condensate-producing HVAC component, a corrosion-resistant drain pan (e.g., galvanized steel, plastic) included that
drains to a drainage system or conspicuous point of disposal in case of blockage. Backflow prevention valve included if
connected to a shared drainage system.

Exception:

E1.13.1 Any auxiliary protection method specified in 2021 IMC section 307.2.3 is permitted.

1.13.2 Tank-type water heaters and hot water storage tanks located where water leakage from the tank could cause damage, shall be
installed:

1.13.2.1 Over a corrosion-resistant drain pan that drains to a conspicuous point of disposal: OR

1.13.2.2 On an impervious surface with a floor drain within 2 ft. and moisture proof material at least 6 in. high installed around
the room perimeter: OR

1.13.2.3 With a leak detection system including an automatic water supply shutoff installed at the water tank.

1.13.3 Non-vented (condensing or heat pump) clothes dryers shall be plumbed to a drain according to the manufacturer's instructions.

1.14 Water Supply Pipes

1.14.1 Insulate hot and cold water supply pipes in exterior building cavities with minimum R4 pipe wrap.

Exceptions:

E1.14.1a Climate Zones 1 -3 located in Dry (B) Zones, as defined by 2021 IECC Figure R301.1.

E1.14.1 b When cavity insulation qualifies as an air barrier and pipes are located within the interior 50% of the wall cavity.
Advisories:

A1.14.1a Pipes should be installed as close as possible to conditioned space while maintaining Grade I insulation installation to
reduce risk of freezing and/or condensation.

A1.14.1 b Insulate hot and cold water supply pipes in exterior building cavities with minimum R4 pipe wrap in all climate zones.

1.15 Water-Resistant Flooring

1.15.1 In areas where moisture or splash damage could occur (e.g., kitchens, bathrooms, entryways, laundry areas, and utility rooms)
water-resistant hard-surface flooring is installed within 4 ft. of any plumbing fixture or exterior door. Wall-to-wall carpeting is
permitted in adjacent spaces (e.g., hallways) beginning at the interior of the jamb or opening.

Note:

N1.15.1 Wood flooring, either pre-finished or site-finished, or sub-flooring rated APA "Exposure 1 " or "Exterior" can be utilized
in these areas, as long as any site-applied finish complies with Items 6.1.

1.16 Class I Vapor Retarders

1.16.1 Class I vapor retarders not installed on the interior side of vapor permeable insulation in below-grade exterior walls.

1.16.2 In Warm Flumid counties as defined by 2021 IECC Section R301.2, Class I vapor retarders are not installed on the interior side of
vapor permeable insulation in above-grade exterior walls except at shower and tub walls.

Note:

N1.16.2 Class I vapor retarders, such as mirrors, may be used if mounted with clips or other spacers that allow air to circulate
behind.

1.17 Moisture Management Inspection

1.17.1 Interior Inspection (gut rehabs only)

1.17.1.1 The Verifier shall perform an inspection to identify areas of moisture intrusion in the building envelope. Inspection of

wall sheathing behind exterior cladding must be done prior to insulation and interior finishes. Where moisture intrusion
is evident behind cladding and fenestrations, cladding must be removed to address the integrity of flashing and the
WRB. In all accessible attic and roof assemblies, visually verify no active water leaks, as evidenced from active water
intrusion or staining on roof decking and/or ceiling materials. Where moisture intrusion is evident through roof
assemblies, sufficient roofing materials must be removed to adequately repair leaks.

Note:

N1.17.1.1 Where preliminary interior inspection reveals areas of building envelope degradation or potential moisture
intrusion, the Verifier shall determine if envelope repairs are required. Surfaces are not required to appear
"new" cosmetically: however, areas of rot and decay must be repaired, including proper flashing and/or

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sealant to minimize moisture intrusion in the building assembly. Structural materials with staining from
former leaks are permitted to remain uncoated/untreated, so long as they are not in the occupiable spaces
of the building. Roof sheathing and materials with visible water stains within an unoccupied attic do not
need to be replaced unless the structural integrity of the material has been compromised from water
damage.

1.17.1.2 If visual mold and/or stains from water or fungal growth or moisture issues (e.g., condensation on pipes, leaks around
windows, doors, wall penetrations, roofs, flashing, foundations, plumbing components, and fixtures, etc.) are evident,
the source is identified, addressed, and remedied. Remediation of mold shall be addressed by one of the following
options:

i. If an area of suspected mold is less than 10 sq. ft., remediation can be addressed by the building owner
(Refer to Mold CleanupTips andTechniques).

ii. Areas of suspected mold larger than 10 sq. ft., or areas of any size that have been damaged by water
containing sewage, shall be remediated in accordance with the recommendations in the EPA guide, " Mold
Remediation in Schools and Commercial Buildings" or the guidelines of the American Conference of
Governmental Industrial Hygienists (ACGIH). States and local agencies may require certification, training, or
examinations for practitioners in the industry of mold remediation and environmental management. See the
EPA's list of state contacts to inquire about local requirements and recommended credentials at
www.epa.nov/indoor-air-qualitv-iaq/epa-renional-office-and-state-indoor-air-qualitv-information.

1.17.1.3 During construction and/or renovation, building materials with visible signs of water damage or mold are not installed or
allowed to remain. Lumber with "sap stain fungi" is exempt from Item 1.18.1 as long as the lumber is structurally
intact.

1.17.1.4 Framing members and insulation products having high moisture content are not enclosed (e.g., with drywall).

Note:

N1.17.1.4 For wet-applied insulation, follow the manufacturer's drying recommendations.

Advisory:

A1.17.1.4 The EPA recommends that lumber moisture content be <18%.

1.17.2 Exterior Inspection

1.17.2.1 Exterior above-grade surfaces (e.g., fenestrations, siding, flashing, roof-to-wall connections) are visually verified to be
free from degradation or potential moisture intrusion. If evident, the source is identified, addressed, and remedied.

Note:

N1.17.2 Exterior surfaces can be inspected from the ground or from building openings (e.g., fenestrations). Where

preliminary exterior inspection reveals areas of building envelope degradation or potential moisture intrusion,
the Verifier shall determine if closer inspection and/or envelope repairs are required. Surfaces are not required
to appear "new" cosmetically; however, areas of rot and decay must be repaired, including proper flashing
and/or sealant to minimize moisture intrusion in the building assembly.

Advisories:

A1.17a Exterior wood surfaces should be back primed and coated with stain, paint, or equivalent.

A1.17b Install water-resistive barriers and protect building openings/fenestration immediately following rough framing.

A1.17c Remove standing water and use fans and/or dehumidifiers to remove moisture.

A1.17d If standing water or ice is found to be present following the completion of rough framing and dry-in activities,
the Verifier should request a root cause analysis and corrective action plan to be included with final verification
documents.

2. Radon

Introduction: Items 2.1 and 2.2 are not required for garage spaces that are compliant with ANSI/ASFIRAE 62.1 -2022, Sections 5.2 and
6.5, nor for buildings with raised-pier foundations (i.e. no solid perimeter foundation wall) with no ground contact. Where a building has a
mechanical room(s) or conditioned walk-up entry with ground contact, the home/building must comply with Items 2.1. and 2.2. Consult
the EPA's radon zone maps bv state to determine requirements below based on the location of the home or building being constructed.
Voluntary consensus standards referenced below for best practices in radon resistant new construction (RRNC) and radon testing can be
found at https://standards.aarst.orn/.

2.1 Radon Risk Reduction Strategy

2.1.1 In EPA Radon Zone 1, construct buildings with either:

2.1.1.1 An active radon mitigation system meeting the requirements outlined in Item 2.2; OR

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2.1.1.2 A passive radon reduction system meeting the requirements outlined in Item 2.2, and conduct testing upon
completion of construction confirming that radon levels are below 4 picocuries per liter (pCi/l).

2.1.2 In EPA Radon Zone 2, construct buildings with either:

2.1.2.1 A passive or active radon reduction system meeting the requirements outlined in Item 2.2; OR

2.1.2.2 Conduct testing upon completion of construction confirming that radon levels are below 4 pCi/l.

2.1.3 In EPA Radon Zone 3:

2.1.3.1 Provide the occupants of one- and two-family dwellings and townhouses with the EPA's Basic Radon Facts along with
the owner and occupant information kit (see Section 7).

Note:

N2.1 Where radon testing is performed to meet the above requirements, testing shall follow protocols outlined in ANSI/AARST MAH
2023 for single-family dwellings OR ANSI/AARST/MA-MFLB 2023 for other residential or mixed-use buildings. Where radon
levels are found to be above 4 pCi/l, mitigation with an active radon system is required, followed by post-mitigation testing to
confirm levels below 4 pCi/l. Radon test results shall be furnished to the Verifier and maintained with certification
documentation.

2.2 Radon-Resistant Construction

2.2.1 During the installation of a newlv installed passive or active radon system, builders are required to include the features in Items
2.2.1.1 through 2.2.1.3. While builders are not required to maintain documentation demonstrating compliance for each individual
certified home, builders are required to develop a process to ensure compliance for each certified home (e.g., incorporate these
requirements into the Scope of Work for relevant sub-contractors, require the site supervisor to inspect each home for these
requirements, and/or sub-contract the verification of these requirements to aVerifier):

2.2.1.1 Capillary break and vapor retarder installed according to Items 1.4.1 through 1.4.4, irrespective of climate zone or soil
drainage.

2.2.1.2 A 3- or 4-in. diameter gas-tight vertical vent pipe is installed, clearly labeled upon installation as a component of a radon
reduction system. The vent pipe shall be connected to an openT-fitting in the aggregate layer (or connected to
geotextile drainage matting according to the manufacturer's instructions) beneath the vapor retarder, terminating
outdoors a minimum of 12 in. above the roof. At least 10 ft. of horizontal perforated drain tile shall be attached to theT-
fitting beneath the vapor retarder placed over earthen crawlspaces and below concrete slabs. Suction points are not
permitted on sump lids.

2.2.1.3 Where a foundation drainage system discharges to daylight and is also connected to the soil gas collection plenum of a
passive or active radon system, a backwatervalve (i.e. check valve or other means) is installed in the foundation
drainage system to isolate the soil gas collection plenum from any openings to atmosphere (e.g. drain tile outfall,
window wells).

Where a passive or active radon system is installed. Verifiers shall visually verify the following features:

2.2.1.4 Radon fan (in the case of an active system) OR an electrical receptacle (in the case of a passive system) is installed in
an accessible location outside the thermal and air barrier boundary of the building. Additionally, fan location is
prohibited in a basement, crawlspace, or garage that is located below conditioned space, unless the garage is
compliant with ANSI/ASHRAF 62.1-20??. Sections 5.2 and 6.5.

2.2.1.5 The branch circuit supply shall be labeled at the electrical panel indicating its intended use.

2.2.1.6 Where an active radon system is installed, a system monitoring mechanism (e.g. negative pressure meter, such as a
manometer type pressure gauge) shall be connected to the fan piping and located where it can be easily observed by
the occupants or maintenance personnel.

Exceptions for gut-rehabilitations:

E2.2.1 Where the requirements in Item 2.2.1 cannot be verified for existing homes/buildings in Radon Zones 1 and 2, radon
testing is permitted upon completion of construction/renovation to verify radon levels are below the EPA action level
(4pCi/l). Single-family homes shall be tested following procedures outlined in ANSI/AARST MAH 2023, and all other
residential or mixed-use buildings shall be tested following procedures outlined in ANSI/AARST MA-MFLB 2023.

Where radon testing results in levels > 4 pCi/l, an active radon mitigation system shall be installed with verification of
Items 2.2.1.4 to 2.2.1.6, followed by post-testing to verify radon levels are below 4pCi/l. Radon test results shall be
furnished to the Verifier and maintained with certification documentation.

Note:

N2.2 Consult local building codes to determine whether additional radon requirements or regulations apply. Also consult the
EPA's Building Radon Out (EPA 402-K-01 -002) for general guidance on installing radon-resistant features.

Advisories:

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A2a Elevated levels of radon have been found in buildings built in all three zones on the EPA's Map of Radon Zones.The EPA

recommends radon-resistant features for buildings in all EPA Radon Zones, and that all buildings with or without radon-resistant
features be tested for radon prior to occupancy.

A2b While it is commonly assumed that the lowest levels in the building will have the highest concentration of radon, that is not
always the case; elevated levels of radon may be found on all levels in buildings. Consult the EPA's list of regional, state, and
tribal radon programs for contact information and current data about radon in your area.

A2c Radon levels below 4 pCi/L still pose some risk, and radon levels can be reduced to 2 pCi/L or below in most homes with radon-
resistant construction and/or mitigation. If short-term testing results indicate radon levels > 2 pCi/L, consider mitigating or
performing a long-term test (> 90 days) to acquire a more accurate representation of annual radon exposure in the home.

A2d Larger buildings and multifamily properties may share mitigation systems across multiple units or may require multiple soil gas
vent systems to accommodate large building footprints. Radon mitigation systems should be installed in multiple locations
when building components, such as structural beams, interrupt movement of soil gases to the vent system. See ANSI/AARST
CC-1000 for electric metering guidance in shared (collateral) mitigation systems, as well as for maximum nominal sizes of soil
gas collection plenums and corresponding pipe sizes.

A2e The EPA recommends the use of radon monitors and/or alarms to inform occupants of potentially elevated levels of radon gas in
the home. Radon monitoring devices may be subject to error and/or drift if not calibrated according to manufacturer's
instructions. As such, the EPA recommends testing and/or monitoring with devices listed by either the National Radon
Proficiency Program (NRPP) or the National Radon Safety Board (NRSB).

3. Pest Prevention

Introduction: Builders are required to promptly remediate pest infestations that are found during construction and to deliver IAP certified
buildings without visible signs of active termites, pest infestation, or structural damage. Where active pest infestation or structural
damage is visible or suspected, the Verifier may withhold certification until pest infestations and/or pest contaminated materials are
remediated.

3.1 Pest Barriers

3.1.1 Exterior penetrations (i.e., plumbing, electrical, chimney flashing, etc.) and joints between the foundation and exteriorwall
assemblies are sealed where accessible.

3.1.2 Rodent/bird screens provided for all architectural openings that cannot be fully sealed.

3.1.3 Screen, louver, or grille provided for all ventilation termination fittings. Openings in the screen/louver/grille must be no smaller
than 0.25 in. square and no larger than 0.5 in. in any dimension in accordance with 2021 IRC 303.6. Screens for radon exhaust
systems are not required, but where provided, screen mesh shall be no smaller than 0.5 in. square.

3.1.4 Dryer ducts include a weather-resistant termination or louver in accordance with dryer manufacturer's instructions. Where dryer
vents include a grille, the majority of openings must be no less than 0.5 in. in any direction.

3.1.5 GOLD Screens are provided for all operable windows.

Advisories:

A3.1a In jurisdictions designated by the code official as having a "Moderate to Heavy" termite infestation probability (e.g., 2021 IRC
Table R301.2):

i. Foundation walls are recommended to be solid concrete or masonry with a top course of solid block, bond beam, or
concrete-filled block.

ii. Interior, ground-contact concrete slabs are recommended to be constructed with 6 x 6 in. welded wire fabric, or the
equivalent, and concrete walls should be constructed with reinforcing rods to reduce cracking.

A3.1 b In jurisdictions designated by the code official as having a "Very Heavy" termite infestation probability (e.g., 2021 IRCTable
R301.2):

i. Foam plastic insulation is not recommended to be installed on the exterior face of below-grade foundation walls or
under slabs.

ii. Foam plastic insulation installed on the exterior of above-grade foundation walls should be covered with moisture-
resistant, pest-proof material (e.g., fiber cement board or galvanized insect screen at the bottom-edge of openings) and
should be kept a minimum of 6 in. above the final grade and landscape bedding materials.

iii. Foam plastic insulation applied to the interior side of conditioned crawlspace walls is recommended to be kept a
minimum of 3 in. below the sill plate.

iv. Install a sealed termite shield extending a minimum of 0.75 in. past the edges of the foundation wall assembly.

A3.1 c When sealing gaps larger than Va in., which can provide potential points of entry for rodents, copper or stainless-steel wool is
recommended in addition to sealant.

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A3.1 d Install a steel mesh barrier termite control system and implement bi-annual inspections for termite nests and shelter tubes.

3.2 Multifamily Pest Management

3.2.1 Multifamily buildings include a pest management plan for the building maintenance staff or a documented contract with a pest
management company aligning with the principles outlined in the EPA's guide on Integrated Pest Management in Buildings.

3.2.2 In owner/tenant manual, provide guidance for residents on housekeeping practices, refuse removal, and reporting pest
problems promptly to building management.

3.2.3 GOLD Multifamily buildings include sanitary floor drains in common trash/recycling rooms > 70 sq. ft. Floor drains shall include
trap seal protection according to 2021 IRC P3201.2.1.

4. Heating, Cooling, and Ventilation Systems

Introduction: If certifying as ENERGY STAR, Indoor AirPlus requirements shown in italics are satisfied by meeting related ENERGY STAR

requirements, and ENERGY STAR footnotes & exceptions are permitted unless otherwise specified.

Heating and Cooling Design and Inspections

4.1 Heating and Cooling (HAC) System

Introduction: Item 4.1 addresses design load calculations and system sizing specific to heating and cooling systems. For requirements

related to ventilation, see Items 4.6-4.9.

System Design

4.1.1 All newlv installed FIAC systems serving dwelling units shall meet the design and documentation requirements of Sections 3-4
of ANSI/ACCA 5 Ql - 2015. As an alternative, calculate dwelling unit design loads in accordance with ASFIRAE Standard 183 or
Chapter 17 of the 2021 ASFIRAE Flandbook of Fundamentals and select the smallest available equipment size that meets the
loads.

4.1.2 All newlv installed HA C systems serving common spaces shall be selected in accordance with A CCA Manual S or equivalent
equipment sizing procedure.

Notes:

N4.1a Where heating equipment also provides domestic hot water, calculations must be performed to determine how to size the
system to satisfy both loads in accordance with manufacturer's guidance.

N4.1 b While heating-dominant climates are allowed to over-size with respect to the cooling load to achieve higher energy efficiency in
the winter, this design choice may impact the ability of the system to effectively provide humidity control (see Item 4.2).

N4.1c If certifying as ENERGY STAR, ENERGY STAR FIVAC Design requirements satisfy Item 4.1.1 for ducted residential FIAC

systems. Where the ENERGY STAR program does not require heating and cooling design loads to be calculated due to the type
of space conditioning system specified, design loads must still be calculated to meet Indoor AirPlus requirements. Design loads
may be calculated using Unabridged ACCA Manual J v8, Chapter 17 of the 2021 ASFIRAE Flandbook of Fundamentals, or
ASFIRAE Standard 183.

N4.1 d If certifying as ENERGY STAR, where the ENERGY STAR program does not require certain equipment to be selected per ACCA
Manual S, systems such as boilers and mini-split/ multi-split systems must be selected per ACCA Manual S to meet Indoor
AirPlus requirements. For all heating and cooling systems in the building not within the scope of ACCA Manual S, the output
capacity of heating and cooling equipment shall not be greater than that of the smallest available equipment size that exceeds
the loads calculated.

System Performance

4.1.3 For all newlv installed HAC systems, documentation shall be provided to theVerifier, including start-up reports or results of
functional performance tests.

4.1.4 All existing FIAC system components shall be assessed in accordance with the applicable minimum inspection standards of
ANSI/ACCA Standard 4 (Maintenance of Residential FIVAC Systems) or ANSI/ASFIRAE/ACCA Standard 180 (Standard Practice
for Inspection and Maintenance of Commercial FIVAC Systems), and the associated maintenance and service tasks shall be
performed in accordance with the standard.

Note:

N4.1.4 Where inspection of existing FIAC equipment reveals significant dirt, debris, biofilm, or fungal growth, clean and repair
in accordance with ANSI/ACCA Standard 6 (Restoring the Cleanliness of FIVAC Systems) or replace the system
according to the newlv installed criteria above.

Advisories:

A4.1a Air-handling equipment that moves less than 3,000 CFM of air should have a manufacturer's designation for air leakage less
than or equal to 2% of the design airflow rate when tested in accordance with ANSI / ASFIRAE Std. 193.

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A4.1 b Although not required to meet this specification, Chapter 1 of the ASHRAE Handbook of Fundamentals or ACCA Manual P

should be used to identify conditions that might lead to moisture issues and to verify that the design specifications fall within
the 'Comfort Zone' on the psychrometric chart as defined by ANSI/ASHRAE 55.

A4.1 c The EPA recommends but does not require that airflows from air balancing reports for all HAC supply registers and return grilles
are measured using ANSI / ACCA 5 Q1-2015 protocol and verified within the greater of ±20% or ±25 CFM of the design airflow.

A4.1 d Multi-zone ductless systems may require supplementary dehumidification due to a lack of general distribution or circulation, the
use of individual room controls, and the impact of door closures.

4.2 Humidity Control

4.2.1	GOLD A humidity monitoring device is provided in the main living area of the dwelling unit that includes a digital display of
indoor temperature and relative humidity (RH) either on-board or via a web-based app. This requirement shall be met by either:

4.2.1.1	An RH monitor integrated with a thermostat or other central HAC controls; OR

4.2.1.2	A standalone digital hygrometer, either permanently mounted or portable.

Exception:

E4.2.1 Dwelling units in multifamily buildings are not required to include a digital display, so long as remote RH monitoring of
each dwelling unit is achieved by a building management platform.

Advisory:

A4.2.1 The ability to record RH data, either on-board or via a web-based app, for a minimum of 30 days is recommended.

4.2.2	Dwelling units in Moist (A) climate zones 1-4. as defined by 2021 IECC Figure R301.1, shall be served by equipment designed
and installed with sufficient latent capacity to maintain indoor RH at or below 60% in each dwelling unit.This requirement shall
be met by either:

4.2.2.1	A dehumidification system (e.g., ventilating, or whole-home dehumidifier, or a central system with an added coil for
dehumidification) plumbed to a discharge drain, and either integrated with the HVAC system or sized to serve the main
body of the dwelling unit; OR

4.2.2.2	All cooling systems serving dwelling units equipped with additional controls to operate in dehumidification mode (i.e.,
systems that utilize humidity sensor feedback in the control algorithm to provide dehumidification, either automatically
or on-demand, even when cooling is not required).

Notes:

N4.2.2a "Whole-building dehumidifiers" are typically installed within the HAC ductwork to dehumidify multiple rooms and are
often permanent.They may be installed separately from the HAC system and generally process indoor air only.
"Ventilating dehumidifiers" process both indoor and outdoor air.

N4.2.2b Cooling systems only meet this requirement if they contain RH sensors that automatically turn the system off upon

reaching the RH setpoint AND either prevent over-cooling or provide re-heat to maintain indoor temperature setpoints.
For systems that prevent over-cooling, the system is allowed to turn off without reaching the RH setpoint. Cooling
systems with on-demand 'dry mode', like ductless mini-splits, must still meet the same requirements above.

Exception:

E4.2.2 Dwelling units in Climate 7one 4A are exempt from Item 4.2.2 if the following are met:

i.	Humidity monitoring device is installed to meet Item 4.2.1 and has the ability to record RH data for a

minimum of 60 days; AND

a.	Dedicated space, drain, and electrical hook-up is provided to facilitate the future installation of a
supplemental dehumidification system; OR

b.	Estimate is provided to the Verifier using residential building modeling tools with hourly simulations that
the dwelling unit will not exceed 60% RH for more than 876 hours (i.e., 10% of the year).

4.2.3	In Moist (A) Zones and Marine (C) Zones, as defined by 2021 IECC Figure R301.1, where a basement or crawlspace is not
served by a cooling system with humidity controls as outlined in Item 4.2.2.2, provide supplemental active dehumidification,
sized for the total volume of the basement and/or crawlspace according to manufacturer's recommendations. Dehumidifiers
shall be programmed to maintain relative humidity (RH) at or below 60% and shall be continuously drained to the outside or to a
sump pump.

Exception:

E4.2.3 In multifamily buildings, basement spaces that are unfinished and/or not occupiable are recommended, but not
required, to meet Item 4.2.3.

Advisories:

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A4.2.3a To avoid humidity issues during "swing seasons" or low-load periods where space conditioning systems may not be
operating regularly, the EPA recommends an active dehumidification system (in lieu of or in addition to the HAC
system) in crawlspaces and basements.

A4.2.3b Where whole-home dehumidification or HAC systems are utilized to condition below-grade spaces, the EPA
recommends locating the humidity sensor in the basement or crawlspace.

A4.2.3c A humidity monitoring device that includes a digital display of indoor temperature and RH and the ability to record data,
either on-board or via a web-based app, is recommended in basements and crawlspaces in addition to similar RH
monitoring in the main living area of the dwelling unit.

A4.2.3d In multifamily buildings, the EPA recommends meeting Item 4.2.3 for all basement spaces including those that are not
finished or occupiable.

Advisories:

A4.2a The EPA recommends, but does not require, that cooling systems in hot/humid climates utilize controls for immediate blower
shutoff after condenser shutoff, to prevent re-evaporation of moisture off the wet coil.

A4.2b An additional dehumidification system (in lieu of additional HAC controls) is recommended in "Warm-Humid" climates, as
defined by 2021 IECC Figure R301.1.

A4.2c The EPA recommends maintaining indoor relative humidity (RH) between 40%-60% during most times of theyear. In some
instances, particularly during winter months, buildings may have extremely low humidity levels. In such cases, humidification
may be helpful to improve occupant comfort and/or to reduce cracking of wood flooring, furniture, or instruments.

Humidification is currently neither required nor prohibited to earn the Indoor AirPlus label. In cases where humidification is
included in a ducted HAC system, the EPA recommends including automatic controls that limit the indoor relative humidity to
40%. If condensation is discovered on windows or ductwork, the humidifier should be adjusted to a lower maximum RH set
point. Builders should also provide owners/occupants with instructions from the manufacturer on proper use and maintenance
of the humidifier, including the recommendation to use distilled water.

A4.2d The EPA recommends that the indoor dew point temperature be maintained below 60 °F (15 °C) whenever the outdoor air dew
point is above 60 °F (15 °C).

A4.2e Where installed, the EPA recommends whole-home or portable dehumidifier(s) are ENERGY STAR certified.

4.3 Heating and Cooling (HAC) Duct Systems

Introduction: Item 4.3 applies to all ducted systems providing heating and/or cooling (HAC) to the building. HAC ductwork must be

inspected and tested per the following requirements.

Duct Design

4.3.1	In one- and two-family dwellings and townhouses, all newlv installed duct systems are sized according toACCA Manual D. AH
other dwelling units with newlv installed duct systems may use an equivalent duct design standard.

4.3.2	Building cavities, such as any framing space (e.g., between wall studs, floor joists, or ceiling joists) or other interstitial spaces
(e.g., dropped ceilings, plenums, open floor truss cavities), shall not be used to directly supply air to a space or return air to the
air-handling equipment.

Note:

N4.3.2 Building cavities/spaces can be used as "duct chases" that contain supply or return ducts, if those ducts are entirely
made of sheet metal, duct board, and/or flexible duct. For more information, visit: https://basc.pnnl.nov/resource-
auides/buildina-cavities-not-used-supplv-or-return-ducts.

Exceptions:

E4.3.2a Mechanical closets that contain air-handling equipment without ducted returns and instead utilize louvered doors or

openings as the only return air pathway, are permitted if the Verifier-measured pressure difference between the closet
containing the air-handling equipment and the conditioned space, with the air-handling equipment running at high
speed, is < 5 Pa.

E4.3.2b Building framing cavities and other interstitial spaces may be used to directly return air to the air-handling equipment
only where the HAC filter is installed downstream of the cavity/space and the cavity/space is within the building
thermal boundary. In addition, the cavity/space must be included in duct sizing and must be inspected in accordance
with Item 4.3.3. Where the return air pathway is not included in the duct leakage test, the sum of the Verifier-measured
airflows from all return grilles shall be within 20% of the total system return airflow as measured at the air-handling
equipment or as reported in Manual D reports orTAB reports.

Advisory:

A4.3.2 A right-sized, fully ducted return is recommended to help ensure adequate return air through the filter to the air-

handling equipment, rather than a transfer grille or louvered door to the space containing the air-handling equipment.

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Duct Inspection

After all dust-producing construction activities are complete (e.g., drywall, trim carpentry, floor sanding), all duct boots and
ductwork that are visible from the duct opening are verified to be dry and substantially free of dust and debris. Diffusers/g riIles
are recommended, but not required, to be removed for inspection. Alternatively, verification is permitted with photo
documentation from the builder or HVAC contractor at the time of diffuser/grille installation, including a photo of each return
opening and at least one supply opening in the dwelling unit.

Note:

N4.3.3 Where visible portions of ducts and boots are not substantially free of dust and debris, they must be thoroughly

vacuumed prior to final inspection. Where duct systems are found to have visible mold growth or vermin infestation,
ducts shall be cleaned in accordance with ANSI/ACCA Standard 6 (Restoring the Cleanliness of HVAC Systems). Prior
to cleaning, retrofitting, or replacing any ducts or components of the duct system, the cause or causes of moisture or
mold growth must be determined and corrected.

Advisory:

A4.3.3 To reduce the likelihood of contaminating the ducts, the EPA recommends covering duct openings during all phases of
construction.

Existing ducts (gut rehabs only) shall be in good condition (e.g., connected to boots, no tears in flex ducts), and exterior surfaces
of ducts and insulation in and around insulated ducts shall be dry and free of mold.

Advisory:

A4.3.4 Metal supply ductwork that provides space cooling should be insulated (R-4 or greater) even when located within
conditioned space.

Ductwork installed outside the thermal and air barrier boundary is sealed at transverse joints, longitudinal seams, duct wall
penetrations, and duct boots sealed to drywall or subfloor using mastic systems, internal aerosol-based sealant, or UL-listed
tapes used in accordance with their listing. Cloth duct tape is prohibited in all locations.

Advisory:

A4.3.5 Where tape is used for duct sealing, the EPA recommends that it meets the applicable requirements of UL 181A or UL
181 B.

Duct System Performance

4.3.6 For duct systems serving individual dwelling units, Verifier-measured total duct leakage tested in accordance with

ANSI/RESNET/ICC Std. 380, with air handler & all ducts, building cavities used as ducts, & duct boots installed, meets one of
the following two options:

i. Rough-in:

a. For duct systems with no ducted returns, the greater of < 4 CFM25per 100 sf of CFA or< 40 CFM25.

b. For duct systems with one or two ducted returns, the greater of < 4 CFM25 per 100 sf of CFA or< 40 CFM25.

c. For duct systems with three or more ducted returns, the greater of < 6 CFM25 per 100 sf of CFA or< 60 CFM25.

ii. Final (with register grilles atop the finished surface (e.g., drywall, floor) installed):

a. For duct systems with no ducted returns, the greater of< 8 CFM25 per 100 sf of CFA or< 80 CFM25.

b. For duct systems with one or two ducted returns, the greater of < 8 CFM25 per 100 sf of CFA or< 80 CFM25.

c. For duct systems with three or more ducted returns, the greater of < 12 CFM25 per 100 sf of CFA or< 120
CFM25.

Exception:

E4.3.6 Total duct leakage testing is not required for ducted HAC systems serving more than one dwelling unit or for ducted
HAC systems where the total supply duct length is < 10 ft.

Notes:

N4.3.6a A 'ducted return' is defined as a continuous duct made of sheet metal, duct board, or flexible duct that connects one or
more return grilles to the return-side inlet of the air handler. Any other approach to convey air from return or transfer
grille(s) to the air handler, such as the use of building cavities, does not constitute a 'ducted return'. Where there are no
'ducted returns', the duct leakage test shall include the leakage from the air handler and supply side of the forced air
system. Where building cavities used to return air to the air handler are included in the duct leakage test, the
allowances for "One or two ducted returns " shall be permitted.

N4.3.6b Registers atop carpets are permitted to be removed and the face of the duct boot temporarily sealed during testing.

4.3.3

4.3.4

4.3.5

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4.3.7 For duct systems serving individual dwelling units, Verifier-measured duct leakage to outdoors (DLTO) is < 4 CFM25 per 100 sf

of CFA or <40 CFM25 as tested in accordance with ANSI/RESNET/ICC Std. 380.

Note:

N4.3.7 If certifying as ENERGY STAR SFNH, meeting SFNFI requirements satisfies Item 4.3.7. If certifying as ENERGY STAR
MFNC, Item 4.3.7 exceeds MFNC requirements and testing is required, unless specifically exempted below.

Exception:

E4.3.7a DLTO is not required if all ducts and the air handler are within the thermal and air barrier boundary of the dwelling unit.

E4.3.7b DLTO testing can also be waived if total duct leakage at rough-in or final is < 4 CFM25 per 100 sf of CFA or < 40
CFM25, whichever is larger.

E4.3.7c For dwelling units in multifamily buildings, testing DLTO is not required if the air handler is within the thermal and air
barrier boundary of the dwelling unit and less than 10 ft. of the dwelling-unit ducts are located outside the thermal and
air barrier boundary of the dwelling unit.

4.4 Location of Heating, Cooling, and Ventilation (HVAC) Air-Handling Equipment and Ductwork

4.4.1 Do not locate FIVAC air-handling equipment or ductwork in garages.

Note:

N4.4.1 In one- and two-family dwellings and townhouses with attached garages, ducts and equipment for heating, cooling, or
ventilation may be located in building framing cavities adjacent to garage walls or ceilings if they are separated from the
garage space with a continuous thermal barrier and air barrier. Mechanical rooms with air-handling equipment adjacent
to the garage are permitted to have a garage-side access door, so long as the door is insulated, gasketed or weather-
stripped, and has self-closing hinges. These allowances are not permitted for dwelling units that are above or adjacent
to parking garages in multifamily buildings.

Note:

N4.4.1 This item does not apply where the system provides space conditioning and/orventilation only for the garage,
independent of systems that serve dwelling units.

Advisories:

A4.4.1a Air-handling equipment should be installed in a location accessible to the occupant, FIVAC technician, or building
maintenance staff to facilitate cleaning, maintenance, and to provide access to the heating and cooling cores and
condensate pans. The EPA recommends that access to an unvented attic should be provided by a permanent stair, a
pull-down stair or ladder with a minimum capacity of 300 pounds (136 kg), or direct access to the equipment from a
door (e.g., knee wall or unfinished mechanical room).

A4.4.1 b In flood-prone areas, the FIVAC air-handling equipment is recommended to be installed above the 10Oyear flood level.

4.4.2 AH HAC supply and return ducts located outside the building's thermal and air-barrier boundary shall be insulated to >R-6.

4.4.3 GOLD All newly installed and existing FIAC air-handling equipment and ductwork must be located within the thermal and air

barrier boundary to minimize the potential for future leakage to outdoors and associated pressure imbalances.

Note:

N4.4.3 This item does not apply to equipment or ductwork that only provide ventilation.

Exceptions:

E4.4.3a Ducts (but not air handlers) are permitted to be outside of the home/unit's thermal and air barrier boundary if total duct
leakage is measured < 1 CFM25 per 100 sf of conditioned floor area, at rough-in or final, with or without the air handler.

E4.4.3b Up to 10 ft. of total duct length is permitted to be outside of the home/unit's thermal and air barrier boundary.

E4.4.3c Ducts (but not air handlers) may be located in a vented attic if minimum R-8 duct insulation is used, duct leakage to
outdoors is measured < 3 CFM25 per 100 sf of conditioned floor area, and:

i. In Moist (A) climate zones (per 2021 IECC Figure R301.1), an additional 1.5 in. (min.) of closed-cell spray foam
encapsulates the ducts and ductwork is buried under 2 in. (min.) of blown-in insulation; OR

ii. In Dry (B) and Marine (C) climate zones (per 2021 IECC Figure R301.1), ductwork is buried under at least 3.5
in. of blown-in insulation.

E4.4.3d Systems which meet the criteria for "Ducts Located in Conditioned Space" as defined by the 2021 IECC Section
R403.3.2.

E4.4.3e Jump ducts which do not directly deliver conditioned air from the FIAC unit may be located in attics if all joints,
including boot-to-drywall, are sealed per Item 4.2, and the jump duct is fully buried under the attic insulation.

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E4.4.3f Ducts and air-handling equipment may be located within an uninsulated and unvented crawl space or basement when
dehumidification is used to meet the requirement of Item 4.2.3.

E4.4.3g Ducts and air-handling equipment associated with rooftop make-up air units or dedicated outdoor air systems (DOAS)
that provide ventilation, but also provide supplemental heating and cooling, are permitted to be outside of the building's
thermal and air barrier boundary.

4.5 Pressure-Balanced Bedrooms

4.5.1 Where ducted systems provide heating and/or cooling to the bedroom, bedrooms shall be pressure-balanced using any

combination of transfer grilles, jump ducts, dedicated return ducts, and undercut doors. In one-and two-family dwellings and
townhouses, bedrooms shall achieve a Verifier-measured pressure differentials Pa and< +3 Pa with respect to the main body
of the dwelling unit when all air handlers are operating. As an alternative to the ± 3 Pa limit, a Verifier-measured pressure
differentiates Pa and< +5 Pa is permitted to be used for bedrooms with a design airftow> 150CFM. In dwelling units in
multifamity buildings, bedrooms with a design airftow> i 50 CFM shall achieve a Verifier-measured pressure differential > -5 Pa
and < +5 Pa with respect to the main body of the dwelling unit when all air handlers are operating.

Exception:

E4.5.1 In dwelling units in multif amity buildings, testing is not required where bedroom supply airflow
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the equipment life. The EPA also recommends installing ventilation equipment with the capability to modify ventilation
rates and run-times in response to monitored pollutants. Also note that IAQ contaminant monitoring systems may
require regular maintenance, calibration, and/or replacement of sensor equipment.

A4.6.1 b Where installing balanced or supply ventilation systems, the EPA recommends multiple supply points to properly
distribute outdoor air to all living spaces for all system types.

A4.6.1c Where installing heat or energy recovery ventilation systems, the EPA recommends the following:

i. Minimize intake and exhaust duct length.

ii. Install the room exhaust points high on the walls or in the ceiling.

A4.6.1d Where installing powered supply ventilation, the EPA recommends the following:

i. Locate the supply air grille(s) where it will not deliver unconditioned air near occupants, OR

ii. Supply outdoor air at a minimum temperature of 60°F for a floor diffusor or minimum temperature of 54°F for
a high wall or ceiling diffusor.

A4.6.1 e Where outdoor air ducts are connected to the return side of an air handler, manufacturers' requirements for return air
temperature should be met (e.g., most manufacturers recommend a minimum of 60 degrees Fahrenheit air flow
across furnace heat exchangers).

4.6.2 Mechanical ventilation systems serving dwelling units shall have a manual override control installed (e.g., wall switch, circuit
breaker), that is clearly labeled to identify its function (e.g., to temporarily turn off ventilation during adverse outdoor conditions).
In one- and two-family dwellings and townhouses, the override control shall be readily accessible to the occupant.

In multifamily buildings, the override control shall be readily accessible to the occupant, building owner, or building maintenance
staff.

4.6.3 Where included in the system design, outdoor air inlets are visually verified to pull air directly from outdoors, and not from attics,
crawlspaces, garages, adjacent dwelling units, or common spaces.

4.6.4 Where included in the system design, outdoor air inlets are located > 2 ft. above grade or roof deck; > 3 ft. distance from dryer
exhausts and sources exiting the roof; > 5 ft. stretched-string distance from outlets of both dwelling-unit mechanical exhaust
and local mechanical exhaust not exiting the roof; and> 10 ft. of stretched-string distance from other contamination sources not
exiting the roof. The outlet and inlet of ERV's and HRV's may use a smaller distance if allowed by the ERV/HRV manufacturer.

Advisories:

A4.6.4a Ventilation equipment should be installed in a location accessible to the occupant, FIVAC technician, or building
maintenance staff to facilitate cleaning, maintenance, and to provide access to the heat exchange cores and/or
condensate pans (if applicable).

A4.6.4b Outdoor air inlets should be located so that entering air is not obstructed by snow, plantings, or other material, and in
such a location to promote periodic cleaning.

Ventilation Rates and RunTimes

4.6.5 Total outdoor air supplied to or exhausted from the dwelling unit shall be measured in accordance with ANSI/RESNET/ICC Std.
380 and documented to meet or exceed the dwelling-unit mechanical ventilation rates and run-time (continuous or intermittent)
required in Section 4 of ASFIRAE 62.2-2019, or later versions. Alternatively, the Verifier may collect and review a report provided
by a certified third-party air-balancing contractor.

Note:

N4.6.5 If certifying as ENERGY STAR, compliance with rates and run-times required in ASFIRAE 62.2-2010, 2013 or 2016 do
not automatically satisfy Item 4.6.5.

Ventilation Filtration

4.6.6 Ventilation filtration shall be designed as follows:

4.6.6.1 Where supply or balanced ventilation systems are installed, prior to distribution, outdoor air supplied to the dwelling
unit shall pass through a filter rated:

CERTIFIED: MERV 8 or higher according to ASFIRAE 52.2-2017 or ISO ePM10 according to ISO 16890.

GOLD: MERV 13 or higher according to ASFIRAE 52.2-2017 or ISO ePM1 according to ISO 16890.

Note:

N4.6.6.1 Outdoor air supplied directly to a duct system that passes through the filter of the FIAC air handler satisfies
this requirement.

Advisory:

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A4.6.6.1 The ventilation system should be designed to account for the pressure drop associated with the filter.

4.6.6.2 The ventilation filter shall be installed in locations accessible to the occupant, HVAC technician, or building maintenance
staff.

Advisory:

A4.6.6.2 The outdoor air intake, fan unit, and heat exchanger (if applicable) should be installed in locations accessible
to the occupant or building maintenance staff to facilitate cleaning, maintenance, and to provide access to
the heat exchange cores and/or condensate pans (if applicable).

Sound Rating

4.6.7 Dwelling-unit mechanical ventilation fans located within the dwelling unit shall be rated for sound at a maximum of 1 sone.

Note:

N4.6.7 If certifying as ENERGY STAR MFNC, the maximum sones allowed in Item 4.6.7 are lower (more stringent) than those
allowed by the ENERGY STAR MFNC program, however the same exceptions are allowed.

Exception:

E4.6.7 Sound ratings are not required for ERVs, HRVs, in-iine fans, and HAC air handlers used as part of the ventilation system
and remote-mounted fans located outside the habitable space, bathrooms, toilets, and hallways, with at least 4 ft. of
ductwork between the fan and the intake grille.

4.7 Dwelling-Unit Bathroom Exhaust

4.7.1 In each bathroom, provide local mechanical exhaust ventilation directly to the outdoors, with exhaust airflow rates meeting
ASHRAE 62.2-2019 Section 5 requirements. Bathroom exhaust airflow shall be Verifier-measured in accordance with
ANSI/RESNET/ICC Std 380.

Note:

N4.7.1 Per ASHRAE 62.2, a bathroom is any room containing a bathtub, a shower, a spa, or a similar source of moisture.

4.7.2 Continuously operating bathroom exhaust fans shall be rated for sound at a maximum of 1 sone at an airflow of 20 CFM or
greater. Demand-controlled (i.e., intermittent or resident-operated) bathroom exhaust fans shall be rated for sound at a
maximum of 3 sones at an airflow no less than 50 CFM.

Note:

N4.7.2 If certifying as ENERGY STAR, the maximum sones allowed in Item 4.7.2 may be lower (more stringent) than those
allowed by the ENERGY STAR Residential New Construction programs, however the same exceptions are allowed.

Exception:

E4.7.2 Sound ratings are not required for ERVs, HRVs, in-line fans, and remote-mounted fans located outside habitable
spaces, bathrooms, toilets, and hallways, with at least 4 ft. of ductwork between the fan and the intake grille.

4.7.3 Where the bathroom exhaust fan is part of the dwelling-unit mechanical ventilation, the on/off control must be labelled or
marked to clearly identify its dual function.

4.7.4 GOLD: For bathroom exhaust that does not operate continuously, fans shall be provided with a manually operated timer or
automatic controls based on humidity or occupancy, such that the fan can be operated when the bathroom is occupied and
either for a minimum of 20 minutes after vacated, or until humidity is less than 60%.

4.8 Dwelling-Unit Kitchen Exhaust

4.8.1 In each kitchen, provide demand-controlled (i.e., intermittent, or resident-operated) mechanical exhaust above each cooktop or
range vented directly to the outdoors, by a range hood or appliance-range hood combination. Kitchen exhaust airflow shall be
Verifier-measured in accordance with ANSI/RESNET/ICC Std. 380 to meet the following rates:

CERTIFIED: Verifier-measured exhaust rate of 200 CFM or greater.

GOLD Verifier-measured exhaust rate of 300 CFM or greater.

Note:

N4.8.1a If certifying as ENERGY STAR, the minimum exhaust airflow required in Item 4.8.1 is greater than those required by
the ENERGY STAR Residential New Construction programs, and demand-controlled exhaust is required unless
Exception E4.8.1a applies.

N4.8.1 b Where microwave-range hoods or under-cabinet range hoods are installed, theVerifier shall verify that the range hood
is configured to vent outdoors, rather than recirculate.

Exceptions:

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E4.8.1a While demand-controlled kitchen exhaust is recommended, for dwelling units in multifamily buildings, continuous

kitchen exhaust vented to the outdoors (e.g., HRV/ERV or ceiling/wall mounted fan) may be used in lieu of a demand-
controlled kitchen exhaust fan at the cooktop, if the following requirements are met:

i. Cooktop is electric,

ii. A recirculation range hood with a charcoal filter is installed over the cooktop,

iii. Continuous kitchen exhaust rate of either:

a. 5ACH, OR

b. 50 CFM if the edge of the exhaust fan or intake grille is located within 10 ft. of the edge of the
cooktop or range, as measured horizontally on the floor plan, OR

c. 25 CFM if local mechanical kitchen exhaust is provided using a balanced system and the building has
a Verifier-measured whole-building infiltration rate < 1.0 ACH50 or < 0.085 CFM50 per sq. ft. of
enclosure area.

Exception 4.8.1a does not apply to one- and two-family dwellings or townhouses. (See Item 4.8.2)

E4.8.1b CERTIFIED: Where microwave-range hoods are installed in the Certified tier only, measuring the exhaust airflow is not
required if the following requirements are all met:

i. Cooktop is electric,

Ii. Measured duct length does not exceed 25 ft. and contains no more than 3 elbows,

Iii. Duct sizing meets Compliance Option 3 of the FNFRGYSTAR Kitchen Fxhaust Guidance.

iv. Microwave-range hood is HVI or AFIAM certified, or equivalent, and rated for at least 200 CFM at 0.25 in. WC
(ratings at 0.1 in. WC are not acceptable for airflow but are permitted for sound).

E4.8.1c CERTIFIED: For electric cooktops in the Certified tier only, a downdraft kitchen exhaust fan with a minimumVerifier-

measured exhaust rate of 300 CFM (or 5 ACFI for enclosed kitchens) may be used in lieu of a range hood or appliance-
range hood at the cooktop.

4.8.2 For all dwelling units, where continuous exhaust is present in the kitchen area and separate from the range hood, do not locate
ventilation grilles above or inside a 45-degree angle projected outwards from the cooking equipment element closest to the
grille and install a MERV 3 or washable filter in the ventilation grille to trap grease. In one-and two-family dwellings and
townhouses, continuous exhaust may be present in the kitchen, but may not be used in lieu of a demand-controlled exhaust
fan.

4.8.3 Continuous kitchen exhaust fans shall be rated for sound at a maximum of 1 sone at an airflow no less than 25 CFM.

Demand-controlled kitchen exhaust fans shall have at least one speed setting that is rated for sound at a maximum of 2 sones
at an airflow setting no less than 100 CFM. For exhaust fans with multiple speeds, the setting used to comply with Item 4.8.1
may be different than the setting used to comply with Item 4.8.3. For an exhaust fan with a single speed, this setting must
comply with both Items.

Exception:

E4.8.3 Sound ratings are not required for ERVs, FIRVs, in-line fans, and remote-mounted fans located outside habitable
spaces, bathrooms, toilets, and hallways, with at least 4 ft. of ductwork between the fan and the intake grille.

Advisories:

A4.8a Range hoods and microwave-range hoods are recommended to have a minimum capture efficiency of 70%, as tested in
accordance with current (or amended) editions of ASTM E3087, or equivalent.

A4.8b Range hoods with "smart" controls that meet UL requirements for safety are recommended that will activate/deactivate the
hood automatically based on operation or using sensors such as temperature, humidity, mixed gas, or a combination thereof.

A4.8c To improve installed performance, the EPA recommends the following:

i. Select products that are rated for airflow and sound in accordance with HVI 920, or equivalent, by an administration and
certification body that is accredited in accordance with ISO 17065 and accredited by an accreditation body operating in
accordance with ISO 17011.

ii. Select products that are rated for airflow at a minimum static pressure of 0.375 in. WC.

iii. For kitchen exhaust fans, even when Verifier-measurement of airflow is required, follow the prescriptive duct sizing
requirements inTable 5-3 of ASFIRAE 62.2-201 9 or the FNFRGYSTAR Kitchen Fxhaust Guidance.

iv. Select static vents and termination fittings certified to meet the required CFM at 0.05 in. WC in accordance with HVI
916 or equivalent.

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4.9 Common Space Ventilation Requirements
Ventilation System Design

4.9.1 Provide outdoor air ventilation and exhaust in common spaces of muitifamiiy buildings. Air inlets are visually verified to pull
outdoor air directly from outdoors, and not from attics, crawlspaces, garages, adjacent dwelling units, or other common spaces.
InletfsJ are > 2 ft. above grade or roof deck; > 10 ft. of stretched-string distance from known contamination sources not exiting
the roof, and> 3 ft. distance from dryer exhausts and sources exiting the roof.

Ventilation Rates and RunTimes

4.9.2 Ventilation and exhaust airflows shall be measured and documented to meet or exceed rates required byASHRAE 62.1-2019.
Alternatively, the Verifier may collect and review a report provided by a certified third-party air-balancing contractor.

Note:

N4.9.2 If certifying as ENERGY STAR, compliance with rates required in ASHRAE 62.1-2010, 2013 or 2016 do not automatically satisfy
Item 4.9.2.

Ventilation Filtration and Maintenance

4.9.3 Ventilation filtration shall be designed as follows:

4.9.3.1 Prior to distribution, outdoor air supplied to common spaces in muitifamiiy buildings shall pass through a filter rated:
CERTIFIED: MERV 8 or higher according to ASHRAE 52.2-2017 or ISO ePM10 according to ISO 16890.

GOLD: MERV 13 or higher according to ASHRAE 52.2-2017 or ISO ePM1 according to ISO 16890.

Advisory:

A4.9.3.1 The ventilation system should be designed to account for the pressure drop associated with the filter.

4.9.3.2 The ventilation filter shall be installed in locations accessible to the building maintenance staff.

Advisory:

A4.9.3.2 The outdoor air intake, fan unit, and heat exchanger (if applicable) should be installed in locations accessible to
the building maintenance staff to facilitate cleaning, maintenance, and to provide access to the heat exchange
cores and/or condensate pans (if applicable).

4.10 OtherVentilation Requirements

4.10.1 Central vacuum systems, where installed, shall exhaust outdoors at least 10 ft. from ventilation system air inlets.

4.10.2 Vented clothes dryers shall exhaust outdoors per the manufacturer's instructions.

Advisories:

A4.10a If the dryer exhaust duct exceeds the manufacturer's recommendations in length, diameter, turns, etc., a dryer exhaust duct
power ventilator (DEDPV) certified for safety under UL507 should be installed.

A4.10b Vented clothes dryers can exhaust in excess of 200 CFM when in use, causing depressurization. Providing a make-up air
system with a tight fitting back-draft damper and automatic switch or timer switch is recommended.

Filtration and Air Cleaning

4.11 Particle Filtration for Ducted Heating and Cooling (HAC) Serving Dwelling Units and Common Spaces

4.11.1 For all ducted HAC systems serving dwelling units and common spaces, filters shall be installed and verified to be clean upon
final inspection with the following ratings:

CERTIFIED: MERV 11 or higher according to ASHRAE 52.2-2017 or ISO ePM2.5 according to ISO 16890. Alternatively, MERV 8
filters are permitted where a stand-alone portable air cleaner is provided for each of the two largest living spaces in the
home/apartment. See Item 4.12 for design criteria.

MERV 13 or higher according to ASHRAE 52.2-2017 or ISO ePM1 according to ISO 16890. Alternatively, MERV 11 filters
are permitted where a stand-alone portable air cleaner is provided for each of the two largest living spaces in the
home/apartment. See Item 4.12 for design criteria.

Note:

N4.11.1 If certifying as ENERGY STAR, the minimum filter ratings in Item 4.11.1 exceed ENERGY STAR requirements.
Advisories:

A4.11.1a While not required, filter slots are recommended to be a minimum of 4 in. in width to allow for deeper pleated filters
and reduced pressure drop across the filter.

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A4.11.1b Air filter installation locations should be labeled to disclose the rating of the installed filter, applicable design airflow
rate, and the maximum allowable clean-filter pressure drop.The labels should be permanently affixed to the air filter
installation location and visible to the person replacing the air filter.

A4.11,1c To reduce the likelihood of construction dust contaminating the ducts and air handler, the HAC system should not be
used as temporary space conditioning during construction activities with increased dust (e.g., drywall sanding, floor
sanding).

A4.11.1 d The EPA recommends that filters tested according to ASHRAE Standard 52.2 also utilize the conditioning methods
prescribed by optional Appendix J.

4.11.2 Return air filters shall be installed in locations accessible to the occupant or building maintenance staff for cleaning and/or
replacement.

4.11.3 Filter access panels are equipped with gasket material or comparable sealing mechanism to ensure access panels fit snugly
against the exposed edge of the installed filter to prevent air bypass.

Advisory:

A4.11.3 Filters perform best when the filter rack design includes the following features, which are also included in some
manufacturers' filter media boxes:

i. Flexible, airtight (e.g., closed-cell foam) gasket material on the surface that contacts the air-leaving
(downstream) side of the filter.

ii. Friction fit or spring clips installed on the upstream side of the filter to hold it firmly in place.

4.11.4 All return air and mechanically supplied outdoor air pass through filter prior to conditioning.

Advisory:

A4.11.4 To improve filtration during time periods where the FIAC is not operating frequently (e.g., shoulder seasons), the EPA
recommends operating the air handler daily at a minimum runtime (20-30%) to provide filtration or the alternatives in
Item 4.12 that do not utilize the FIAC system.

4.11.5 Ducted electronic air cleaners (i.e., duct-mounted electrostatic air cleaners, air ionizers, and lamps that emit ultraviolet (UV)
radiation between 100 and 280 nm (UVC)) are tested according to UL 2998 or CSA Standard C22.2 No. 187:20 and must not
generate ozone exceeding concentration limits of 0.005 parts per million. Such devices are permitted, but are not required, in
Indoor AirPlus labeled buildings and apartments.

4.11.6 Ozone generators and devices intentionally using ozone to treat or condition air are prohibited.

Advisory:

A4.11.6 Ozone is a lung irritant that poses health risks. Even at concentrations below public health standards, ozone reacts with
chemicals emitted by common indoor sources such as household cleaning products, air fresheners, deodorizers,
certain paints, polishes, wood flooring, carpets, and linoleum.The chemical reactions produce harmful byproducts that
may be associated with adverse health effects in some sensitive populations.

4.12 Particle Filtration for Non-Ducted HAC Systems Serving Dwelling Units

4.12.1 GOLD In dwelling units with no ducted FIAC system (e.g., ductless mini-splits, hydronic systems, electric resistance heat, or
combinations thereof), provide one of the following methods of indoor air filtration to reduce exposure to particles of indoor
origin:

i. Non-ducted, forced-air FIAC systems include a filter rated MERV 13 or higher according to ASFIRAE 52.2-2017 or rated
ePM1 according to ISO 16890: OR

ii. A stand-alone portable air cleaner is provided for each of the two largest living spaces in the home/apartment, sized to
meet the square footage of each room, based on the verified Clean Air Delivery Rate and room size calculation per
ANSI/AFIAM Standard AC-1. (Maximum room size for a verified air cleaner is equal to the verified Smoke CADR value x
1.55.) Air cleaners must meet ozone emission limits of U L 2998: OR

iii. Transfer fan is installed with a minimum MERV 13 filter designed to operate during all occupiable hours and to
exchange air between the two largest living spaces (at minimum).

Advisory:

A4.12a In common spaces with no ducted FIAC system, the EPA recommends one of the above strategies to improve particle
filtration.

4.13 Gas-Phase Air Cleaning Devices

4.13.1 Where installed, gas-phase air cleaning devices do not intentionally use ozone to treat or condition air.

Advisories:

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4.13a Gaseous pollutants include inorganic gases such as combustion gases (e.g., carbon monoxide and nitrogen dioxide), ozone, and
organic chemicals that are not attached to particles. Hundreds of different gaseous pollutants have been detected in indoor air.
Gas-phase air cleaning technology includes adsorbent media (e.g., activated carbon), chemisorbent media (e.g., media coated or
impregnated with reactive compounds), catalytic oxidation, plasma, and intentional ozone generation. A summary of gas-phase
cleaning technology can be found in Residential Air Cleaners - ATechnical Summary (EPA, 2018), along with other resources on
Air Cleaners and Air Filters in the Home.

4.13b When utilized with in-duct HAC systems, gas-phase filters that contain sorbents should generally be located downstream of
particle air filters.

4.14 Microbial Disinfection

4.14.1 Where installed, ultraviolet germicidal irradiation (UVGI) or other electronic air cleaners (e.g., plasma generators, photocatalytic
oxidizers (PCOs), etc.) must not exceed ozone concentration limits of 0.005 parts per million as specified in UL 2998.

Note:

N4.14 When UVGI is used, it must be used in addition to—not as a replacement for—conventional particle filtration systems.

Advisories:

A4.14a Ultraviolet germicidal irradiation (UVGI) air cleaners are designed to use UV lamps to kill or deactivate microorganisms such as
viruses, bacteria, and fungal spores and fragments that are airborne or growing on surfaces (e.g., cooling coils, drain pans,
ductwork, filters). UVGI lamps for in-duct airstream irradiation are tested using ANSI/ASHRAE Standard 185.1, and UVGI lamps
for in-duct surface irradiation are tested using ANSI/ASHRAE Standard 185.2. Prolonged direct UVGI exposure can destroy
vegetative microbial growth. However, typical UVGI air cleaners designed for use in buildings do not deliver sufficient UV doses
to effectively kill or deactivate most airborne microorganisms because the exposure period is too short and/or the intensity is
too low. Thus, UVGI does not appear to be effective as a sole control device. A summary of UVGI cleaning technology can be
found in Residential Air Cleaners - ATechnical Summary (EPA, 2018), along with other resources on Air Cleaners and Air Filters
in the Home.

A4.14b When UVGI lamps are installed in HAC systems, access panels for AHUs should be interlocked with automatic shutoff

mechanisms to prevent accidental exposure to UV radiation, and an inspection window that blocks UV energy (e.g., plastic or
glass) is recommended to be installed to be able to confirm lamp operation. Builders should ensure that homeowners and
occupants are aware of the hazards related to accidental UV exposure and should brief them on the maintenance and usage
requirements for any UVGI system installed.

A4.14c Ozone is a lung irritant that poses health risks. Even at concentrations below public health standards, ozone reacts with
chemicals emitted by common indoor sources such as household cleaning products, air fresheners, deodorizers, certain
paints, polishes, wood flooring, carpets, and linoleum.The chemical reactions produce harmful byproducts that may be
associated with adverse health effects in some sensitive populations, including formaldehyde, other aldehydes, ketones, and
peroxides. Usage of technologies that emit ozone should be carefully considered before being installed in buildings, and
builders should ensure that homeowners and occupants are fully informed about the potential hazards and emission
byproducts that may result from usage of these devices.

5. Pollutant Control

Introduction: If certifying as ENERGY STAR, Indoor AirPlus requirements shown in italics are satisfied by meeting related ENERGY STAR

requirements, and ENERGY STAR footnotes & exceptions are permitted unless otherwise specified.

A5. The EPA recommends using a PM 2.5 monitor to help occupants identify high-polluting events of both indoor and outdoor
sources of particulate matter (see also: Low-Cost Air Pollution Monitors and Indoor Air Quality).

5.1 Combustion Appliances

5.1.1 CERTIFIED: Where naturally drafted furnaces, boilers, and water heaters are installed within the building's pressure boundary,
they must pass the maximum depressurization testing per ANSI/BPI 1200-S-2017 Standard or ANSI/ACCA 12 QH-2018 and
shall exhaust to the outdoors no less than 2 ft. higher than any obstructions within a 10 ft. radius.

Combustion furnaces, boilers, and water heaters located within the building's pressure boundary are mechanically
drafted or direct-vented.

Advisory:

A5.1.1 The EPA recommends installing mechanically drafted or direct vent appliances, in lieu of naturally drafted appliances.

5.1.2 Fireplaces located within the building's pressure boundary are mechanically drafted or direct vented.

5.1.2.1 Liquid or gas-burning fireplaces shall have an affixed glass front or gasketed door.

5.1.3 No unvented combustion appliances other than cooktops, ranges, or ovens are located within the building's pressure boundary.
(See Item 4.8.1 for range and kitchen exhaust ventilation requirements).

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5.1.4 Existing chimneys and flues still in service have passed a Level II inspection according to NFPA 211, as performed by a CSIA
certified chimney sweep (or other similar certification).

Solid fuel burning fireplaces and appliances

5.1.5 Meet the following energy efficiency and emissions standards and restrictions for all fireplaces and other solid fuel-burning and
space-heating appliances located within the building's pressure boundary:

5.1.5.1 Site-built masonry fireplaces designed for open fires are sealed to prevent use or retrofitted with other compliant
appliances;

5.1.5.2 Factory-built wood-burning fireplaces shall have a dedicated outside air supply and meet the certification requirements
of UL 127.

Advisory:

A5.1.5.2 Factory-built wood burning fireplaces qualified under the EPA's wood-burning fireplace program are
recommended. See: https://www.epa.aov/burnwise/voluntarv-fireplace-proaram.

5.1.5.3 Wood stove and fireplace inserts are tested to meet the safety requirements of UL 1482, AND they shall meet the
emission requirements of the EPA's New Source Performance Standards for new residential wood heaters. See:
https://www.epa.aov/residential-wood-heaters/final-2020-new-source-performance-standards-residential-wood-heaters.

5.1.5.4 Pellet stoves shall meet the requirements of ASTM E1509, AND they shall meet the emission requirements of the EPA
New Source Performance Standards for new residential wood heaters.

5.2 Carbon Monoxide Detection

5.2.1 All dwelling units equipped with a fuel-burning appliance, a fuel-burning fireplace, or an attached garage shall have carbon

monoxide (CO) detection installed in accordance with the 2021 IBC Section 915 or the 2021 IRC Section R315 (only applicable
for one- and two-family dwellings and townhouses).

Notes:

N5.2.1a The above requirements are not intended to supersede or replace applicable laws or codes in force by the authority
having jurisdiction. Additional local requirements may apply.

N5.2.1 b Where CO detection is installed prior to construction finishes, alarms/detectors shall be protected from dust, paint, and
other contaminants.

Advisory:

A5.2 For added protection for young children, expectant parents, older adults, and persons with medical conditions who may be more
vulnerable to lower levels of carbon monoxide, the EPA recommends that CO detectors are installed that display and alarm at
levels that are lower than UL 2034 alarm thresholds.

5.3 Pollutant Control from Smoking andVaping

5.3.1 Occupant has been provided with the EPA's brochure on SecondhandTobacco Smoke and the Health ofYour Family or with a
link to the EPA's resources on Secondhand Smoke and Smoke-free Homes.

5.3.2 In multifamily buildings, smoking and vaping are prohibited in indoor common areas, including but not limited to, corridors,
vestibules, stairwells, and community rooms, and the prohibition is posted in a prominent entryway or lobby.The prohibition is
explicitly communicated in the building rental or lease agreements or in condo or co-op association covenants and restrictions,
with provisions for enforcement.

5.3.3 In multifamily buildings, when designated outdoor smoking/vaping areas are provided, they are located a minimum of 25 ft. from
entries, outdoor air intakes and operable windows, and signage is provided.

Advisories:

A5.3a The EPA recommends prohibiting smoking and vaping of tobacco or other substances throughout the entire building, including
within living units, on patios, and balconies. Communicate these additional prohibitions in the building rental or lease
agreements or in condo or co-op association covenants and restrictions and include provisions for enforcement.

A5.3b Exposure to contaminants is not limited to tobacco smoke. The EPA advises building owner manuals to include information on
the dangers of personal-use products, which produce harmful contaminants, such as smoking tobacco and other substances,
vaping, and burning candles or incense.

5.4 Pollutant Control through Minimized Infiltration

5.4.1 Seal crawlspace and basement perimeter walls to prevent outside air infiltration. Vented crawlspaces and basements are not
permitted.

Note:

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N5.4.1 Homes/buildings in areas designated as 100-year flood zones may need to utilize insulated, weather-stripped flood
vents to meet the above requirement. Additional local requirements may also apply per jurisdiction. For more
information on designated 100-year flood zones, see FEMA's definition of Special Flood Flazard Areas:
www.fema.aov/flood-zones.

5.4.2 Conduct airtightness testing in accordance with procedures in ANSi/RESNET/iCC Std. 380. Verifier-measured airtightness shall
demonstrate compliance with the following leakage rates, as applicable to the type of dwelling unit:

5.4.2.1 CERTIFIED: For detached dwelling units > 1,000 ft2, Verifier-measured airtightness shall be no greater than 5 ACFI50.
For detached dwelling units < 1,000 ft2, Verifier-measured airtightness shall be no greater than 0.30 CFM50 per sq. ft.
of dwelling-unit enclosure area.

For detached dwelling units > 1,000 ft2, Verifier-measured airtightness shall be no greater than 3 ACFI50. For
detached dwelling units < 1,000 ft2, Verifier-measured airtightness shall be no greater than 0.25 CFM50 per sq. ft. of
dwelling-unit enclosure area.

5.5.3.2 CERTIFIED: For all other dwelling units, the average compartmentalization of allVerifier-measured airtightness test
results shall be no greater than 0.3 CFM50 per sq. ft. of dwelling-unit enclosure area. In multifamily buildings, where
sampling of compartmentalization tests is permitted, test at least 20% of the dwelling units that are adjacent to the
garage.

For all other dwelling units, the average compartmentalization of allVerifier-measured airtightness test results
shall be no greater than 0.23 5CFM50 per sq. ft. of dwelling-unit enclosure area. In multifamily buildings, where
sampling of compartmentalization tests is permitted, test at least 20% of the dwelling units that are adjacent to the
garage.

5.5 Attached Garages and Parking Structures

5.5.1 Assemblies between attached garages and occupiabie spaces, including common spaces, are air-sealed before installing
insulation. Doors between occupiabie spaces, including common spaces, and attached garages are made substantially air-tight
with weather stripping or equivalent gasket.

5.5.2 In one- and two-family dwellings and townhouses with attached, private garages, meet one of the following requirements:

5.5.2.1 Verify that the garage-to-unit air barrier can maintain a pressure difference of greater than 45 Pa while the dwelling unit
maintains a 50 Pa pressure difference with respect to the outdoors. All operable garage openings shall be closed
during this test; OR

5.5.2.2 Equip the attached garage with an exhaust fan that is vented directly outdoors.The installed fan shall have a minimum
Verifier-measured airflow of 100 CFM, or greater if required by the authority having jurisdiction.The fan shall be wired
for continuous operation or with automatic fan controls (e.g., a motion detector) that activate the fan whenever the
garage is occupied and operate for at least 1 hour after the garage has been vacated.

5.5.3 In multifamily buildings, where an exhaust system is installed in a shared parking garage, the system shall be equipped with
controls that sense CO and N02, providing a minimum continuous ventilation rate of 0.05 CFM/ff in standby mode, and 0.75
CFM/ff otherwise.

Advisories

A5.5a The EPA recommends installing a garage exhaust fan capable of moving 0.75 CFM/ft2 if the occupant is expected to occupy the
garage for work or recreational activities over extended periods of time.

A5.5b The EPA recommends installing ENERGY STAR certified exhaust fans to reduce energy consumption and sound levels.

A5.5c The EPA recommends providing occupants with information in the Owner and Occupant Information Kit on the importance of,
and methods for, ensuring adequate ventilation in the garage while occupied for extended periods of time.

5.6 Combustible Fuels

5.6.1 There shall be no combustible liquid or gas fuels (e.g., fuel oil, gasoline, kerosene, propane, ethanol, etc.) stored within the
pressure boundary upon final verification.

5.6.2 Supplemental portable combustion equipment (e.g., portable generators, lawn maintenance equipment, etc.) shall not be
operated or stored within the pressure boundary upon final verification.

6. Building Materials

Introduction: The following section applies to newlv installed materials and finishes. Surfaces in garages are exempt for the purpose of
these requirements. Download How to Find Indoor AirPlus Compliant Low Emission Products, which provides guidance on identifying
products that are compliant with these specifications, including the identification of product certification and labeling programs that are
acceptable, fNote: This guidance will be undated when these new specifications are finalized. The current version of this document is
applicable to Version 1 of the Indoor AirPlus Construction Specifications.1

Notes:

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N6a For Items 6.1 - 6.6, verification of compliance with this section may occur using records provided to the verifier from the builder,
documenting the specific products that will be used throughout the home/building. The verifier must confirm the products listed
in the record meet the requirements of this section.The builder is responsible for notifying the verifier of any product
substitutions that occur through the course of construction/development and providing the verifier with documentation for re-
verification and retention. Documentation may be provided to the verifier once for multiple homes in a specific development or
community project (or for multiple units in a multifamily building). Such records may include but are not limited to a cut sheet,
purchase order, or corporate-wide declaration or sales agreement, documenting the product selection(s) for the specified
development/community.

N6b Interior architectural coatings, gypsum board, and other products that are formulated to remove formaldehyde and other

aldehydes in indoor air and are tested and labeled in accordance with ISO 16000-23, Indoor air - Part 23, may or may not be
compliant with theVOC standards in this section. The EPA has not independently evaluated data on the relative efficacy and
long-term impacts of sorptive materials addressed by the ISO 16000-23 standard. Compliance with ISO 16000-23 alone does
not confer compliance with the requirements in IAP Section 6.

N6c During construction of gut rehabilitations, builders and raters are reminded to remain vigilant to avoid hazards from asbestos and
lead-based paint, and must follow all relevant federal, state, and local regulations.

Asbestos can be found in a variety of building materials, including but not limited to roofing and siding shingles, insulation of
various types, ceiling tiles, floor tiles, textured paint, and wall patching compounds. Asbestos fibers may be released into the air
by the disturbance of asbestos-containing material during demolition work, repair, and remodeling. Many states administer an
asbestos program and state departments of environmental protection or health will be the best place to address asbestos
questions specific to one's locality. See also https://www.epa.aov/asbestos for additional information and resources.

Exposure to lead comes from human activities including past use of lead-based paint in homes. In 1978, the federal
government banned consumer uses of lead-based paint, but some states banned it even earlier. Any renovation, repair, or
painting (RRP) project in a pre-1978 home or building can easily create dangerous lead dust. The EPA requires that RRP projects
that disturb lead-based paint in homes built before 1978 be performed by lead-safe certified contractors. Learn more about lead
at https://www.epa.nov/lead. Learn more about the RRP rule at https://www.epa.nov/lead/lead-renovation-repair-and-paintinn-
pronram.

Advisory:

A6 The EPA recommends ventilating the building with outside air at the highest rate and duration practical during the installation of
products that are known sources of contaminants (e.g., composite woods, carpet and padding, adhesives, site-applied finishes)
and during the period between finishing and occupancy.

6.1 Interior Paints, Finishes, and Coating

6.1.1 Site-applied paints, finishes, and coatings (including such products with sealing or waterproofing properties) shall not exceed

maximum VOC emission levels in accordance with and determined by California Department of Public FHealth (CDPH), "Standard
Method for theTestinn and Fvaluation of Volatile Ornanic Chemical Fmissions from Indoor Sources [Jsinn Fnvironmental
Chambers. Version 1.2—2017."

Note:

N6.1 Some liquid finishing products labeled as "sealants" by the manufacturer may actually be better categorized as a coating or
finish. For the purposes of this requirement, Indoor AirPlus references the SCAQMD definition of "coating" in Rule 1113—"a
material which is applied to a surface in order to beautify, protect, or provide a barrier to such surface." A low emission "sealant','
as required by Indoor AirPlus Item 6.3, is defined by SCAQMD Rule 1168 as "any material with adhesive properties that is
designed to fill, seal, waterproof, orweatherproof gaps or joints between two surfaces. Sealants include caulks."

6.2 Carpets and Carpet Cushions

6.2.1 Carpet and carpet cushions must be low-emitting products with maximumVOC emission levels in accordance with and
determined bvCDPH Standard Method V1.2-201 7.

6.3 Adhesives and Sealants

6.3.1 Site-applied interior adhesives and sealants shall not exceed maximumVOC emission levels in accordance with and determined
byCDPFI Standard Method V1.2-2017.

Note:

N6.3 Some liquid finishing products labeled as "sealants" by the manufacturer may be better categorized as a coating or finish, and
thus apply to Item 6.1. For the purposes of this requirement, Indoor AirPlus references the SCAQMD definition of "sealant" in
Rule 1168— "any material with adhesive properties that is designed to fill, seal, waterproof, orweatherproof gaps or joints
between two surfaces. Sealants include caulks."

6.4 Hard Surface Flooring

6.4.1 Interior hard surface flooring materials and underlayment shall not exceed maximumVOC emission levels in accordance with
and determined bvCDPH Standard MethodV1.2-2017.

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Exception:

E6.4.1 Materials that are inherently non-emitting sources of VOCs, which include stone, ceramic, metal, glass, concrete, and
clay brick.

6.5 Gypsum Board

6.5.1 Interior gypsum board and joint compound shall not exceed maximum VOC emission levels in accordance with and determined
bvCDPH Standard Method V1 ,?-?017.

6.6 Insulation

6.6.1 GOLD Insulation materials installed in wall, floor, ceiling, or rafter cavities, as well as on the interior surface of foundation walls
shall not exceed maximumVOC emission levels in accordance with and determined bvCDPH Standard Method V1 ,?-?017.

Exceptions:

E6.6.1a Pipe insulation.

E6.6.1 b Board insulation installed outside of other exterior sheathing.

7. Occupant Education

7.1 Owner and Occupant Information Kit

Builders are required to provide the following information to occupants, building/home owners, or property managers:

7.1.1 Instruction manuals for the following newlv installed appliances and systems: HAC systems and accessories, ventilation
systems (both local and dwelling-unit), air cleaners, dehumidifiers, moisture and/or IAQ monitors, combustion appliances, sump
pumps, and radon systems (if installed).

7.1.2 Operations and maintenance recommendations, including suggested schedules and sources for the replacement of filters in all
ventilation and air handling equipment.

Advisory

A7.1 Provide the homebuyer or building manager with information that addresses the importance of ensuring that manually

controlled ventilation options (e.g., bathroom, kitchen, or garage exhaust fans: operable windows, doors, etc.) are used when
strong pollutant sources are present, such as when using common household products (e.g., cleaning products, pesticides) and
when using the garage for hobbies or other pollutant generating activities.

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Abbreviations and Acronyms

AARST American Association of Radon Scientists and HAC
Technologists

ANSI/AARST Soil Gas Control Systems in New Construction of HCO

CC-1000 Buildings

ANSI/AARST Reducing Radon in New Construction of One-& Two- HUD

CCAH Family Dwellings & Townhouses

ANSI/AARST Protocol for Conducting Measurement of Radon and HVAC

MAH Radon Decay Products in Homes

ANSI/AARST Protocol for Conducting Measurement of Radon and IAQ

MAMF Radon Decay Products in Multifamily Buildings

AC115 Acceptance Criteria for Waterproof Membranes for ICC

Flooring and Shower Lining

ACCA Air Conditioning Contractors of America IECC

ACCA Manual D Residential duct design IMC

ACGIH American Conference of Governmental Industrial In.
Hygienists

ACM Asbestos containing materials IRC

AHAM Association of Home Appliance Manufacturers ISO

ANSI American National Standards Institute MERV

ANSI/ASHRAE Ventilation for Acceptable Indoor Air Quality MF

62.1-2019

ANSI/ASHRAE Ventilation and Acceptable Indoor Air Quality in Low-Rise mil

62.2-2019 Residential Buildings

APA The Engineered Wood Association min.

ASHRAE American Society of Heating, Refrigerating, and Air NFPA

Conditioning Engineers

ASTM American Society for Testing and Materials NO2

CADR Clean air delivery rate NFRC

CARB California Air Resources Board Pa

CSIA Chimney Safety Institute of America pCi/L

ccSPF Closed cell spray polyurethane foam RH

CDPH California Department of Public Health SCAQMD

CFDS Composite foundation drainage system spec.

CFM Cubic feet per minute sq. ft.

CI Condensation index UL

CO Carbon monoxide UV

CO2 Carbon dioxide UVC

CZ Climate zone UVGI

DLTO Duct leakage to outdoors VOC

EPA Environmental Protection Agency w.c.

FEMA Federal Emergency Management Agency WRB

ft. Foot or feet

Heating and cooling

Home Certification Organization

Department of Housing and Urban
Development

Heating, ventilating, and air

conditioning

Indoor air quality

International Code Council

International Energy Conservation
Code

International Mechanical Code
Inches

International Residential Code

International Organization for
Standardization

Minimum Efficiency Reporting Value
defined in ASHRAE 52.2-2017
Multifamily

Common term to describe plastic
sheeting thickness; 1 mil equals 0.001
in.

Minimum

National Fire Protection Association
Nitrogen dioxide

National Fenestration Rating Council
Pascal

Picocuries per liter
Relative humidity

South Coast Air Quality Management

District

Specification

Square foot or square feet
Underwriter Laboratories
Ultraviolet light
UV: 200 nm to 280 nm
Ultraviolet germicidal irradiation
Volatile organic compound
Water column
Water resistive barrier

Indoor AirPlusVerification Requirements,Version 2 (July 2024)

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References

2021 ASHRAE Handbook of Fundamentals

ACCA Manual D: Residential Duct Systems. Third Edition Version 2.5-2016. Air Conditioning Contractors of America.

ACCA Manual P: Psychrometrics.

ANSI/AARST CCAH 2020: ANSI/AARST Standard: Reducing Radon in New Construction of 1 & 2 Family Dwellings andTownhouses.

2020. American Association of Radon Scientists andTechnologists.

ANSI/AARST CC-1000 2018: ANSI/AARST Standard: Soil Gas Control Systems in New Construction of Buildings. 2018. American National
Standards Institute / American Association of Radon Scientists andTechnologists.

ANSI/AARST MAFI 2019: Protocol for Conducting Measurements of Radon and Radon Decay Products in Flomes.

ANSI/AARST MAMF 2017: Protocol for Conducting Measurements of Radon and Radon Decay Products in Multifamily Buildings.

ANSI/AARST RMS-MF 2018: Radon Mitigation for Multifamily Buildings

ANSI/AARST SGM-SF 2017: Soil Gas Mitigation Standards for Exiting Flomes

ANSI/ACCA 5 Ql - 2015: ANSI/ACCA FIVAC Quality Installation Specifications

ANSI/ACCA 12 QFI -2018: Flome Evaluation and Performance Improvement

ANSI/ACA Standard 6: Restoring the Cleanliness of FIVAC Systems

ANSI/ASFIRAE Standard 55-2020. Thermal Environmental Conditions for Fluman Occupancy

ANSI/ASFIRAE Standard 185.1-2020: Method of Testing UV-C Lights for Use in Air-FHandling Units or Air Ducts to Inactivate Airborne
Microorganisms

ANSI/ASFIRAE Standard 185.2-2020: Method of Testing Ultraviolet Lamps for Use in FIVAC&R Units or Air Ducts to Inactivate
Microorganisms on Irradiated Surfaces

ANSI/BPI 1200-S 2017: Standard Practice for Basic Analysis of Buildings

ANSI/RESNET/ICC Standard 380-2019: Standard for Testing Airtightness of Building, Dwelling Unit, and Sleeping Unit Enclosures;
Airtightness of Fleating and Cooling Air Distribution Systems; and Airflow of Mechanical Ventilation Systems.

ANSI/RESNET/ICC 301 -2022: Standard for the Calculation and Labeling of the Energy Performance of Dwelling and Sleeping Units

ANSI/ASFIRAE/ACCA Standard 4-2013: Maintenance of Residential FIVAC Systems

ANSI/ASFIRAE/ACCA Standard 183, 2013 or 2017: Peak Cooling and Fleating Load Calculations in Buildings Except Low-Rise Residential
Buildings.

ANSI/NFRC 500-2020: Procedure for Determining Fenestration Product Condensation Index Ratings

APA: American Plywood Association provides a voluntary product standard for structural plywood and oriented strand board (OSB).
http://www.apawood.ora/plvwood

ASFIRAE Flandbooks: ASFIRAE Flandbook Series. American Society of Fleating, Refrigerating, and Air-Conditioning Engineers.

ASFIRAE 52.2: ANSI/ASFIRAE Standard 52.2-2017: Method ofTesting General Ventilation Air-Cleaning Devices for Removal Efficiency by
Particle Size. 2017. American Society of Fleating, Refrigerating, and Air-Conditioning Engineers.

ASFIRAE 62.1: ANSI/ASFIRAE Standard 62.1 -2022: Ventilation and Acceptable Indoor Air Quality. 2022. American Society of Fleating,
Refrigerating, and Air-Conditioning Engineers

ASFIRAE 62.2: ANSI/ASFIRAE Standard 62.2-2019: Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings. 2019.
American Society of Fleating, Refrigerating, and Air-Conditioning Engineers.

ASTM C1178: Standard Specification for Coated Glass Mat Water-Resistant Gypsum Backing Panel. 2013. American Society forTesting
and Materials.

ASTM C1278: Standard Specification for Fiber-Reinforced Gypsum Panel. 2006. American Society forTesting and Materials.

ASTM C1325: Standard Specification for Fiber-Mat Reinforced Cementitious Backer Units. 2022. American Society forTesting and
Materials.

ASTM D3273: StandardTest Method for Resistance to Growth of Mold on the Surface of Interior Coatings in an Environmental Chamber.

2021. American Society forTesting and Materials.

ASTM E1745: Standard Specification for Plastic Water Vapor Retarders Used in Contact with Soil or Granular Fill under Concrete Slabs.
2017. American Society forTesting and Materials.

Indoor AirPlusVerification Requirements,Version 2 (July 2024)

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ASTM E1509: ASTM Standard E1509-04: Standard Specification for Room Heaters, Pellet Fuel-BurningType. 2004 (RA2013). American
Society forTesting and Materials.

ASTM E1602: ASTM Standard E1602-03(2010) e1: Standard Guide for Construction of Solid Fuel Burning Masonry Heaters. 2010.
American Society forTesting and Materials.

ASTM D3273-2000: Fungal Resistance Test for Coated Surfaces

ASTM E3087-2018: StandardTest Method for Measuring Capture Efficiency of Domestic Range Hoods

CA Section 01350: CDPH Standard Method V1.2-2017; California Section 01350: Special Environmental Requirements Specification:
Standard Method for theTesting and Evaluation of Volatile Organic Chemical Emissions from Indoor Environmental Chambers. 201 7.

State of California. https://archive.cdph.ca.nov/pronrams/IAO/Documents/CDPH-IAO StandardMethod V1 2 2017.pdf.

California Air Resources Board (CARB) AirborneToxics Control Measure (ATCM) Phase II to Reduce Formaldehyde Emissions from
Composite Wood Products. CATitle 17, Section 93120. https://ww2.arb.ca.nov/our-work/pronrams/composite-wood-products-pronram.

California Air Resources Board: Suggested Control Measure for Architectural Coatings. May 2020.

CSA 6.19-01: CAN/CSA Standard 6.19-01 (R2016): Residential Carbon Monoxide Alarming Devices. 2001 (Reaffirmed 2016). Canadian
Standards Association.

CSA Standard C22.2: Electrostatic air cleaners. 2020. Canadian Standards Association.

ENERGY STAR Residential New Construction Programs: U.S. Environmental Protection Agency.
https://www.enernvstar.nov/partner resources/residential new/pronram reqs?s=mena.

ENERGY STAR Kitchen Exhaust Guidance: Item 8.1 of the National Rater Field Checklist requires that a local mechanical exhaust system
be installed in each kitchen and exhaust directly to the outdoors.

EPA's Indoor AirPlus: How to Find Compliant Building Materials provides guidance on identifying compliant products.
http://www.epa.nov/indoorairplus/indoor-airplus-pronram-documents.

EPA's Integrated Pest Management in Buildings. 2011. U.S. Environmental Protection Agency.

EPA Radon Maps: EPA's Map of Radon Zones. 2008. U.S. Environmental Protection Agency.

EPA's SecondhandTobacco Smoke and the Health ofYour Family. Informational handout on the dangers of secondhand smoke.

EPA's Lead Renovation, Repair and Painting (RRP) Program-2008 (Amended 2010 and 2011): Aims to protect the public from lead-based
paint hazards associated with renovation, repair, and painting activities.

EPA's New Source Performance Standard: Clean air standards for residential wood heaters. 2015. U.S. Environmental Protection Agency.

EPA's Residential Air Cleaners-ATechnical Summary. 2018. U.S. Environmental Protection Agency.

FEMA's Special Flood Hazard Areas. 2020. https://www.fema.nov/nlossarv/special-flood-ha7ard-area-sfha.

Formaldehyde Emission Standards for Composite Wood Products:Toxic Substances Control ActTitleVI Formaldehyde Emission
Standards for Composite Wood Products. 2016. 40 Code of Federal Regulations, Part 770.

https://www.federalrenister.nov/documents/2016/12/12/2016-27987/formaldehvde-emission-standards-for-composite-wood-products.

HVI 920: Product Performance Certification Procedure Including Verification and Challenge updated February 28, 2020.

HVI 916: Air FlowTest Procedure updated September 29, 2015

ICC: International Builders Code 2018

ICC-ES per AC 115 (from N1.14.1)

IECC: International Energy Conservation Code. 2021. International Code Council, Inc.

IMC: International Mechanical Code. 2021. International Code Council, Inc.

IRC: International Residential Code for One- andTwo-Family Dwellings. 2021. International Code Council, Inc.

ISO ePM1: Based on ISO 16890 refers to the particle size fraction in the range from 0.3 pm to 1 pm
ISO ePM2.5: Based on ISO 16890 refers to the particle size fraction in the range from 0.3 pm to 2.5 pm

ISO 16890-1: 2016: Establishes an efficiency classification system of air filters for general ventilation based upon particulate matter (PM).
ISO 17065: Product Certification Bodies Accreditation

ISO 17011: 2004: Specifies general requirements for accreditation bodies assessing and accrediting conformity assessment bodies
(CABs).

ISO 16000-23:2018: Specifies a general laboratory test method for evaluating the reduction of formaldehyde and other carbonyl
compounds.

Indoor AirPlus Verification Requirements, Version 2 (July 2024)

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NFPA 211 (2019): Standard for Chimneys, fireplaces, Vents, and Solid Fuel Burning Appliances
South Coast Air Quality Management District (SCAQMD): Rule 1113 -Architectural Coatings
South Coast Air Quality Management District: Rule 1168 - Adhesives and Sealant Applications
UL 127: Standard for Factory-Built Fireplaces. 2011. Underwriters Laboratories, Inc.

UL 181 A: Standard for Closure Systems for Use with Rigid Air Ducts. 20013 (ANSI Approved 2021). Underwriters Laboratories, Inc.

UL 181 B: Standard for Closure Systems for Use with Flexible Air Ducts and Air Connectors. 20013 (ANSI Approved 2021). Underwriters
Laboratories, Inc.

UL 1482: (ANSI Approved 2022): Standard for Solid-Fuel Type Room Fleaters. 2011. Underwriters Laboratories, Inc.

UL 2034: (ANSI Approved 2022): Standard for Single and Multiple Station Carbon Monoxide Alarms. 2017. Underwriters Laboratories,
Inc.

UL 2998 2020: Zero Ozone Emissions Validation

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OB Extremely Hot Dry

¦ 1A Very Hot Humid
IB Very Hot Dry

¦ 2A Hot Humid

¦ 2B Hot Dry

¦ 3A Warm Humid
3B Warm Dry

¦ 3C Warm Marine
4A Mixed Humid
4B Mixed Dry
4C Mixed Marine

B 5A Cool Humid

5B Cool Dry
B 5C Cool Marine

¦ 6A Cold Humid
| 6B Cold Dry
| 7 Very Cold

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vvEPA

United States
Environmental Protection
Agency

Office of Air and Radiation
EPA 402/K-24/003

Homes with the Indoor AirPlus label are designed
and verified for improved indoor air quality
compared to homes built to minimum code.

www.epa.gov/iap

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