Centrifugal Downblast Roof Exhaust Fan Drive Type Belt Drive Assembly Unassembled Mounting Location Roof Wheel Diameter 18 1/2 in Base Diameter Not Applicable Base Length 30 in Base Width 30 in Base Shape Square Minimum Airflow 1 882 cfm Maximum Airflow 5 677 cfm Maximum Motor Horsepower 2 hp Minimum Motor Horsepower 1/4 hp Minimum Motor Speed 730 RPM Maximum Motor Speed 1 460 RPM Maximum Static Pressure 2 in wc For High-Static Pressure Applications No