Axial Downblast Roof Exhaust Fans Assembly Unassembled Mounting Location Roof Blade Diameter 24 in Base Diameter Not Applicable Base Length 34 in Base Shape Square Base Width 34 in Maximum Airflow 5 320 cfm Minimum Airflow 1 352 cfm Maximum Motor Horsepower 1 hp Minimum Motor Horsepower 1/4 hp Minimum Motor Speed 601 RPM Maximum Motor Speed 954 RPM Maximum Static Pressure 3/4 in wc Drive Type Not Applicable For High-Static Pressure Applications No For Air Type Clean Air