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               Service and Product Provider
                        Success Story
Service and Product Provider
                 Customer
Cambridge Engineering, Inc.
760 Long Road Crossing Drive, Chesterfield, MO 63005
Business: Heating/Ventilating Systems
Ken Williams, Director of Marketing
Phone: (800)899-1989/Fax: (636)530-6133
Email: kwilliams@cambridge-eng.com
                 DURR Systems, Inc.
                 40600 Plymouth Road, Plymouth, Ml 48170
                 Business: Paint and Assembly Systems
                 Gordon Harbison, CEM, CSDP, Senior Manager
                 Phone: (734)459-68007 Fax: (734)459-5837
                 Email: gordon.harbison@durrusa.com
Michigan office/plant replaces steam boiler with energy efficient space heating system.

Project Scope
DURR decommissioned a gas-fired steam boiler system used to heat both the office and large production area
at their facility. The 20-yr old boiler was in good working order but was expensive to operate and maintain. As
part of their commitment to reduce energy consumption and operating costs, DURR partnered with Cambridge
Engineering to install a high efficiency indirect-fired hot water boiler system to provide office heating, and a new
energy efficient direct-fired heating system in their 180,000 sq. ft. production area.

Project Summary
The energy efficient heating system was installed during January while the facility was occupied. No temporary
heating was required during the conversion. High temperature rise space heaters with 100% combustion
efficiency and 92% thermal efficiency provided significant energy savings. The heating system's use of 100%,
non-recirculated fresh air improved ventilation and indoor air quality for the office and production area.

   •   Energy Savings
       The new combined office/plant heating system reduced natural gas consumption for this facility by an
       average of 23%.  Annual Carbon Dioxide (CO2) emissions were reduced by over 300  tons, the
       equivalent of planting over 1,000 new trees each year.
   •   Financial Return
       The project payback goal of less than 3  years was met based on documented energy savings and
       reduced maintenance costs.
   •   Other Benefits
       The new heating system improved ventilation for the office and plant, solved a negative air problem, and
       provided additional heat at cold dock door production areas for increased employee comfort.

Monitoring & Verifying Energy Savings
Utility bills from before and after the conversion were compared in a Heating Degree Day (HDD) annual gas
consumption analysis that accounted for year-to-year changes in weather. The DURR facility averaged 4.48
MCF/HDD annual gas consumption with the gas-fired steam boiler, which was reduced to 3.44 MCF/HDD with
the new heating system.

Distinguishing Value
Energy modeling confirms that efficient space heating technology used by Cambridge Engineering provides
significant energy savings for other similar commercial/industrial buildings with large open spaces that require both
space heating  and ventilation with fresh outside  air. This ASHRAE 90.1 compliant  heating equipment can qualify
for EPAct Federal tax deductions and utility rebates.
AEPA
   United States
   Environmental Protection
   Agency
                                     CAMBRIDGE
       ENGINEERING INC
More heat, less energy
[PURR]

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