Centrifugal Downblast Roof Exhaust Fan Drive Type Belt Drive Assembly Unassembled Mounting Location Roof Wheel Diameter 21 in Base Diameter Not Applicable Base Length 30 in Base Width 30 in Base Shape Square Minimum Airflow 2 087 cfm Maximum Airflow 6 640 cfm Maximum Motor Horsepower 2 hp Minimum Motor Horsepower 1/4 hp Minimum Motor Speed 600 RPM Maximum Motor Speed 1 200 RPM Maximum Static Pressure 1 3/4 in wc For High-Static Pressure Applications No