According to the US Department of Energy report Energy Savings Potential and RD&D Opportunities for Commercial Building HVAC Systems, (PDF) HVAC accounts for 30% of annual commercial energy consumption. Of that, fans make up about 29% of HVAC energy use. Supply and exhaust fans are the major players, primarily because most fans operate continuously while the building is occupied. There is a wide variation in efficiency between different fan designs (from as low as 40% to as high as 80%). In light of their long operating hours and wide-ranging efficiencies, HVAC fans are often good candidates for energy-efficiency retrofits.

In addition to the efficiency of the fan itself, the low cost and wide availability of variable-frequency drives (VFDs) in all horsepower ranges make this technology an important part of most energy-efficiency upgrade strategies.

What are the options?
How to make the best choice
Maintaining fan performance
What’s on the horizon?
Who are the manufacturers?
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