Energy reductions can be realized by requiring fans to meet a minimum energy efficiency.
The Fan Efficiency Grade (FEG) is a new energy metric that recognizes the relationship between the impeller diameter and peak total efficiency. FEG is defined by ANSI/AMCA 205-12 Energy Classification for Fans, and ISO 12759 Fans- Efficiency Classification for Fans. The FEG is based on peak total efficiency and is a measure of the aerodynamic quality of the fan. Addendum U to ASHRAE 90.1 sets the minimum FEG at 67 on all fans, except those under 5 HP, emergency only fans, and power roof ventilators.
One of the most exciting innovation in air handling is to use a multiple fan array to move air versus traditional single or dual fans.
Unlike other fan arrays available today, a FANWALL system is more than off-the-shelf fans and motors arranged in an array. It incorporates FANWALL TECHNOLOGY—innovated and manufactured specifically for fan array systems—to create an integrated system of state-of-the-art fans, motors, cabinetry, controls, and accessories. These components have been successfully blended to match new construction and retrofit application requirements, while providing the benefits of redundancy, quiet and vibration-free operation, optimized energy efficiency from design minimum to maximum flow, and low cost maintenance and service.