Multi-Wing says its EMAX4™ Fans provides up to 77% total efficiency. The customized fan has a computer-optimized blade design for maximum performance. According to company officials, the EMAX4 decreases noise by 2 to 3 dB and reduces energy consumption in air-cooled condensers, commercial refrigeration, chillers, cooling towers, evaporators, and more. A modular design, EMAX4 is available with 5, 6, 7, 9, or 12 blades in diameters from 22 in to 36 in. Pitch angles include 20-degrees to 48.5-degrees in 3.5-degree increments. EMAX4 blades are constructed of glass-reinforced polyamide (PAG), and the hub is made from pressure die cast silicon aluminum alloy.