Exhaust Fan, Assembled Unassembled, Blade Diameter 20 in, Blade Material Steel, Frame Material Steel, For Maximum Motor Horsepower 3/4 hp, For Maximum Motor Speed 1,241 RPM, For Minimum Motor Horsepower 1/4 hp, For Minimum Motor Speed 861 RPM, Maximum Airflow 6,348 cfm, Maximum Static Pressure 0.75 in wg, Minimum Airflow 4,404 cfm, For -Out Height 22 1/2 in, For -Out Width 22 1/2 in, For -Out Diameter 22 1/2 in, Guard Type None, Method of Construction Stamped, Number of Blades 5