The ratio of the electrical input power of a reference fan to the electrical input power of an actual fan at a given duty point (airflow, pressure, and air density), FEI considers motors and drives, not just fans, which makes it consistent with new efficiency metrics for pumps and air compressors.
With the 2019 editions of NFPA 80 and NFPA 105 came the allowance for remote periodic testing of smoke and combination fire/smoke dampers. For building owners, this can mean significantly reduced costs and increased safety.
The 2019 edition of ANSI/ASHRAE/IES 90.1, “Energy Standard for Buildings Except Low-Rise Residential Buildings (ASHRAE 90.1),” adopts a new fan efficiency metric, Fan Energy Index (FEI).