Exhaust Fan, Assembled Unassembled, Blade Diameter 42 in, Blade Material Aluminum, Frame Material Steel, For Maximum Motor Horsepower 5 hp, For Maximum Motor Speed 903 RPM, For Minimum Motor Horsepower 1 hp, For Minimum Motor Speed 528 RPM, Maximum Airflow 30,825 cfm, Maximum Static Pressure 0.75 in wg, Minimum Airflow 18,024 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 Cast, Number of Blades 6