Axial Upblast Roof Exhaust Fan Assembly Unassembled Drive Type Belt Drive Blade Diameter 24 in Base Diameter Not Applicable Base Length 36 3/8 in Base Width 36 3/8 in Base Shape Square Maximum Airflow 7 766 cfm Minimum Airflow 4 912 cfm Maximum Motor Horsepower 3/4 hp Minimum Motor Horsepower 1/3 hp Maximum Motor Speed 925 RPM Minimum Motor Speed 525 RPM Maximum Static Pressure 1/4 in wc For High-Static Pressure Applications No For Air Type Clean Air