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Steve Byers (cq) uses a Blower Door during his energy efficient house testing for the Environmental Protection Agency on Tuesday morning, August 1, 2006 in the 8100 block of East 29th Ave. at Stapleton in Denver. Byers does testing for the EPA and the Blower Door is used to test air tightness of the home. The EPA says that 20 to 60 percent of all new homes in the future will be energy efficient, including 100 percent of Stapleton's 35,000 new homes. (KEN PAPALEO/ROCKY MOUNTAIN NEWS) *** Stev Byers (cq)

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