Our direct & belt drive fans are centrifugal power roof ventilators designed for exhausting clean air. Capacities up to 40,608 CFM and up to1- 2-inch static pressure. The aerodynamic design of the impeller and orifice results in high air performance and low sound. Typical applications include a wide range of commercial, institutional, and industrial facilities such as schools, office buildings, hospitals, prisons, assembly areas, restaurants, and retail stores.