In the United States, HVAC systems generally consume the largest portion of a commercial building’s energy budget, with supply, return, and exhaust fans accounting for approximately 1.25 quads—or roughly the equivalent of 225 million barrels of oil—of energy use annually (Figure 1). Expected in the fall, the 2013 version of ANSI/ASHRAE/IES Standard 90.1, Energy Standard for Buildings Except Low-Rise Residential Buildings, will include a new fan-efficiency requirement based ...

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