Exhaust Fan, Assembled Unassembled, Blade Diameter 42 in, Blade Material Steel, Frame Material Steel, For Maximum Motor Horsepower 1 1/2 hp, For Maximum Motor Speed 608 RPM, For Minimum Motor Horsepower 1/3 hp, For Minimum Motor Speed 369 RPM, Maximum Airflow 20,998 cfm, Maximum Static Pressure 0.75 in wg, Minimum Airflow 10,191 cfm, For -Out Height 44 1/2 in, For -Out Width 44 1/2 in, For -Out Diameter 44 1/2 in, Guard Type None, Method of Construction Stamped, Number of Blades 6