Centrifugal Downblast Roof Exhaust Fan Drive Type Belt Drive Assembly Unassembled Mounting Location Roof Wheel Diameter 11 in Base Diameter Not Applicable Base Length 22 in Base Width 22 in Base Shape Square Minimum Airflow 793 cfm Maximum Airflow 1 526 cfm Maximum Motor Horsepower 1/3 hp Minimum Motor Horsepower 1/4 hp Minimum Motor Speed 1 635 RPM Maximum Motor Speed 1 800 RPM Maximum Static Pressure 1 1/4 in wc For High-Static Pressure Applications No