Exhaust Fan, Assembled Unassembled, Blade Diameter 48 in, Blade Material Aluminum, Frame Material Steel, For Maximum Motor Horsepower 7 1/2 hp, For Maximum Motor Speed 895 RPM, For Minimum Motor Horsepower 2 hp, For Minimum Motor Speed 576 RPM, Maximum Airflow 45,053 cfm, Maximum Static Pressure 0.75 in wg, Minimum Airflow 28,995 cfm, For -Out Height 50 1/2 in, For -Out Width 50 1/2 in, For -Out Diameter 50 1/2 in, Guard Type None, Method of Construction Cast, Number of Blades 6