American Ultraviolet Corporation, DC24-6-120 Duct Sterilizer
THE ENVIRONMENTAL TECHNOLOGY VERIFICATION
PROGRAM ,O
EW
U.S. Environmental Protection Agency
HRTI
INTERNATIONAL
ETV Joint Verification Statement
TECHNOLOGY TYPE:
APPLICATION:
TECHNOLOGY NAME:
COMPANY:
ADDRESS:
WEB SITE:
E-MAIL:
GENERAL VENTILATION AIR CLEANERS
BIOLOGICAL INACTIVATION EFFICIENCY BY
HVAC IN-DUCT ULTRAVIOLET LIGHT
SYSTEMS
DC24-6-120
American Ultraviolet Corporation
212 S Mount Zion Road
Lebanon, IN 46052
PHONE:
FAX:
800-288-9288,
ext. 201
765-483-9525
http://www.americanultraviolet.com
mstinesfoiauvco. com
The U.S. Environmental Protection Agency (EPA) has created the Environmental Technology
Verification (ETV) Program to facilitate the deployment of innovative or improved environmental
technologies through performance verification and dissemination of information. The goal of the ETV
Program is to further environmental protection by accelerating the acceptance and use of improved and
cost-effective technologies. ETV seeks to achieve this goal by providing high-quality, peer-reviewed data
on technology performance to those involved in the design, distribution, financing, permitting, purchase,
and use of environmental technologies.
ETV works in partnership with recognized standards and testing organizations; stakeholder groups, which
consist of buyers, vendor organizations, permitters, and other interested parties; and with the full
participation of individual technology developers. The program evaluates the performance of innovative
technologies by developing test plans that are responsive to the needs of stakeholders, conducting field or
laboratory tests (as appropriate), collecting and analyzing data, and preparing peer-reviewed reports. All
evaluations are conducted in accordance with rigorous quality assurance protocols to ensure that data of
known and adequate quality are generated and that the results are defensible.
The Air Pollution Control Technology Verification Center (APCT Center) is operated by RTI
International (RTI), in cooperation with EPA's National Risk Management Research Laboratory. The
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American Ultraviolet Corporation, DC24-6-120 Duct Sterilizer
APCT Center conducts verifications of technologies that clean air in ventilation systems, including in-
duct ultraviolet (UV) light systems. This verification statement provides a summary of the test results for
the American Ultraviolet Corporation DC24-6-120 Duct Sterilizer.
VERIFICATION TEST DESCRIPTION
All tests were performed in accordance with RTFs "Bioaerosol Inactivation Efficiency by HVAC In-Duct
Ultraviolet Light Air Cleaner", a supplement to "Test/Quality Assurance Plan for Biological and Aerosol
Testing of General Ventilation Air Cleaners" which was approved by EPA. Testing for biological
inactivation was performed using three organisms - two bacteria (Bacillus atrophaeus and Serratia
marcescens) and one bacterial virus (MS2). To model use in a heating, ventilation and air-conditioning
(HVAC) system, RTI used a test duct designed for testing filtration and inactivation efficiencies of
aerosol, bioaerosol, and chemical challenges.
The testing was conducted in the test duct operated following procedures in the ANSI/ASHRAE
(American National Standards Institute/American Society of Heating, Refrigerating and Air-Conditioning
Engineers) Standard 52.2-1999, Method of Testing General Ventilation Air-Cleaning Devices for
Removal Efficiency by Particle Size. The air flow rate through the duct during this testing was 0.93 m3/sec
(1970 cfm). This flow creates a typical air velocity (492 fbm) in the duct, and has been used extensively
in prior testing of air cleaning devices in this rig. The air temperature entering the device was
approximately 23 °C. Air flow rate and temperature can have an impact on lamp performance, and the
values used in this testing are consistent with vendor specifications. Prior to testing the device, the UV
lamps were operated for a standard 100-hr "burn-in" period.
There are separate runs for each of the three challenge bioaerosols which were injected upstream of the
device. The upstream challenge was ~ 2 x 104 CPU or PFU/ft3. A no-light test was performed with the
UV lights turned off, to determine the microorganism loss that would occur simply as the result of
deposition in the test duct, and as the result of kill caused by the physical rigors of flowing through the
device. The performance of the device was then reported as the device's efficiency in inactivating the
organism with the light on, corrected to account for the loss of organisms observed in the absence of UV
light.
Additional secondary measurements included:
• The direct total power consumption by the lamp and ballast, the pressure drop across the device
(impacting air handler requirements), and the temperature rise through the unit, if any (impacting
cooling coil energy consumption).
• A single measurement of the intensity of 254 nm UV radiation (uW/cm2) at a point 161 cm (63 in.)
upstream from the lamps, to demonstrate that the lamps were functioning and to provide a test
reference value for the laboratory for documentation purposes.
Verification testing of the American Ultraviolet Corporation DC24-6-120 began on July 31, 2007 at the
test facilities of RTI and was completed on August 21, 2007.
VERIFIED TECHNOLOGY DESCRIPTION
The American Ultraviolet Company's DC24-6-120 is part of the DC Series of in-line duct sterilizers that
are designed to install into air duct sections to position high output UVC (short-wave ultraviolet radiation,
in the "C" band - 200 to 280 nanometers) lamp(s) perpendicular to passing airflow for "pass-by" air
sterilization purposes as well as surface sterilization. The ballast enclosure mounts directly to the duct
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American Ultraviolet Corporation, DC24-6-120 Duct Sterilizer
exterior with lamp(s) protruding into the duct section through a cutout in the duct wall. Type 304 stainless
steel construction is utilized for long life. Outdoor ballast enclosures are available as an option. The
SBL415 High Output UVC Lamp is used in the system.
VERIFICATION RESULTS
The American Ultraviolet Corporation DC24-6-120 achieved the biological inactivation efficiency tests
presented in Table 1.
Table 1. Inactivation Efficiency, %
Inactivation
efficiency (UV
light on), %
Spore form of
bacteria
(B. atrophaeus)
98
Vegetative bacteria
(S. marcescens)
>99.5a
Bacterial virus
(MS2
bacteriophage)
99
a - the value 99.5 represents a 95% confidence limit for S. marcescens. There were no downstream counts
measured.
The irradiance was measured as 6290 (iW/cm2 at 161 cm (63 in.) upstream from the lamps with an
airflow of 0.93 m3/sec (1970 cfm). The mean dosage was calculated as 23,600 (iW-s/cm2 with a range of
19,900 - 29,000 (iW-s/cm2. The system had six lamps that were burned in for 100 hours prior to
measurements. The spore form of the bacteria B. atrophaeus is more resistant to being killed by UV light
(irradiation) than the vegetative bacteria S. marcescens.
The APCT Center's quality manager reviewed the test results and the quality control data and concluded
that the data quality objectives given in the approved test/QA plan were attained.
This verification statement addresses the biological inactivation efficiency. Users of this technology may
wish to consider other performance parameters such as service life and cost when selecting an in-duct UV
system for bioaerosol control.
Original signed by Sally Gutierrez. 01/17/08
Sally Gutierrez Date
Director
National Risk Management Research Laboratory
Office of Research and Development
United States Environmental Protection Agency
Original signed by Andrew Trenholm.
Andrew R. Trenholm
Director
APCT Center
RTI International
01/10/08
Date
NOTICE: ETV verifications are based on an evaluation of technology performance under specific, predetermined
criteria and the appropriate quality assurance procedures. EPA and RTI make no express or implied warranties as to
the performance of the technology and do not certify that a technology will always operate as verified. The end user
is solely responsible for complying with any and all applicable federal, state, and local requirements. Mention of
commercial product names does not imply endorsement.
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