Exhaust Fan, Assembled Unassembled, Blade Diameter 36 in, Blade Material Aluminum, Frame Material Steel, For Maximum Motor Horsepower 5 hp, For Maximum Motor Speed 1,166 RPM, For Minimum Motor Horsepower 1 hp, For Minimum Motor Speed 683 RPM, Maximum Airflow 26,979 cfm, Maximum Static Pressure 0.75 in wg, Minimum Airflow 15,803 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 Cast, Number of Blades 6