Exhaust Fan, Assembled Unassembled, Blade Diameter 48 in, Blade Material Steel, Frame Material Steel, For Maximum Motor Horsepower 5 hp, For Maximum Motor Speed 506 RPM, For Minimum Motor Horsepower 1 hp, For Minimum Motor Speed 351 RPM, Maximum Airflow 32,605 cfm, Maximum Static Pressure 0.75 in wg, Minimum Airflow 22,617 cfm, For -Out Height 50 1/2 in, For -Out Width 50 1/2 in, For -Out Diameter 50 1/2 in, Guard Type None, Method of Construction Stamped, Number of Blades 5