Centrifugal Downblast Roof Exhaust Fan Drive Type Belt Drive Assembly Unassembled Mounting Location Roof Wheel Diameter 16 3/4 in Base Diameter Not Applicable Base Length 22 in Base Width 22 in Base Shape Square Minimum Airflow 1 624 cfm Maximum Airflow 4 062 cfm Maximum Motor Horsepower 1 hp Minimum Motor Horsepower 1/4 hp Minimum Motor Speed 865 RPM Maximum Motor Speed 1 375 RPM Maximum Static Pressure 1 1/2 in wc For High-Static Pressure Applications No