Axial Downblast Roof Exhaust Fans Assembly Unassembled Mounting Location Roof Blade Diameter 30 in Base Diameter Not Applicable Base Length 42 in Base Shape Square Base Width 42 in Maximum Airflow 8 056 cfm Minimum Airflow 1 912 cfm Maximum Motor Horsepower 2 hp Minimum Motor Horsepower 1/2 hp Minimum Motor Speed 551 RPM Maximum Motor Speed 875 RPM Maximum Static Pressure 1 in wc Drive Type Not Applicable For High-Static Pressure Applications No For Air Type Clean Air