Fans account for 80 percent of the so-called “parasitic” load according to Michael Ivanovich, director of strategic energy initiatives for the Air Movement Control Association (AMCA) International, in a recent Facilitiesnet article. In order to address the issue of high energy usage associated with fans there needed to be a better way to differentiate the performance of fans. AMCA has developed fan efficiency grades (FEGs) to help facility managers, engineers and owner identify how efficient is the fan they select compared to industry standard . FEGs is defined by AMCA as “a numerical rating that classifies fans by their aerodynamic ability to convert mechanical shaft power to air power” or in simpler terms, a measurement of peak fan efficiency independent of the motor and drive. The author also interviewed Tim Mathson of Greenheck who emphasized that the use of FEGs by facility managers when specifying new fans will result in selection of units that operate in the higher-efficiency regions of the fan curve.