Centrifugal Downblast Roof Exhaust Fan Drive Type Belt Drive Assembly Unassembled Mounting Location Roof Wheel Diameter 50 in Base Diameter Not Applicable Base Length 64 in Base Width 64 in Base Shape Square Minimum Airflow 12 424 cfm Maximum Airflow 37 068 cfm Maximum Motor Horsepower 10 hp Minimum Motor Horsepower 1 hp Minimum Motor Speed 214 RPM Maximum Motor Speed 460 RPM Maximum Static Pressure 1 1/4 in wc For High-Static Pressure Applications No