Exhaust Fan, Assembled Unassembled, Blade Diameter 54 in, Blade Material Steel, Frame Material Steel, For Maximum Motor Horsepower 5 hp, For Maximum Motor Speed 507 RPM, For Minimum Motor Horsepower 1 1/2 hp, For Minimum Motor Speed 343 RPM, Maximum Airflow 44,535 cfm, Maximum Static Pressure 0.75 in wg, Minimum Airflow 30,129 cfm, For -Out Height 56 1/2 in, For -Out Width 56 1/2 in, For -Out Diameter 57 1/2 in, Guard Type None, Method of Construction Stamped, Number of Blades 5