Exhaust Fan, Assembled Unassembled, Blade Diameter 36 in, Blade Material Steel, Frame Material Steel, For Maximum Motor Horsepower 2 hp, For Maximum Motor Speed 684 RPM, For Minimum Motor Horsepower 1/2 hp, For Minimum Motor Speed 433 RPM, Maximum Airflow 19,733 cfm, Maximum Static Pressure 0.75 in wg, Minimum Airflow 12,492 cfm, For -Out Height 38 1/2 in, For -Out Width 38 1/2 in, For -Out Diameter 38 1/2 in, Guard Type None, Method of Construction Stamped, Number of Blades 5