Axial Upblast Roof Exhaust Fan Assembly Unassembled Drive Type Belt Drive Blade Diameter 36 in Base Diameter Not Applicable Base Length 44 3/4 in Base Width 44 3/4 in Base Shape Square Maximum Airflow 19 212 cfm Minimum Airflow 11 600 cfm Maximum Motor Horsepower 2 hp Minimum Motor Horsepower 3/4 hp Maximum Motor Speed 689 RPM Minimum Motor Speed 357 RPM Maximum Static Pressure 3/8 in wc For High-Static Pressure Applications No For Air Type Clean Air