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Fans offer opportunities for significant HVAC energy savings. According to Michael Ivanovich, director of strategic energy initiatives for the Air Movement Control Association (AMCA) International, fans account for 80 percent of the so-called "parasitic" load — that is, HVAC loads other than prime movers like chillers and boilers. Starting in 2007, AMCA began developing a method of rating the efficiency of fans. This work led to fan efficiency gradients (FEGs) — a measurement of peak fan efficiency independent of the motor and drive.
Understanding the basic nature of these FEGs is important for savvy facility managers, principally because these efficiency grades, essentially an index of inherent aerodynamic quality, are referenced in last year’s International Green Construction Code (IGCC), and the 2013 update of ASHRAE 90.1.
More adoption of the AMCA fan standards is likely, says Ivanovich, as AMCA members begin to work with 2015 IECC code language and members of the ASHRAE 189.1 committee.
The gist of AMCA 205 is that: