Exhaust Fan Assembled Unassembled Blade Diameter 54 in Blade Material Aluminum Frame Material Steel For Maximum Motor Horsepower 10 hp For Maximum Motor Speed 716 RPM For Minimum Motor Horsepower 3 hp For Minimum Motor Speed 480 RPM Maximum Airflow 50 124 cfm Maximum Static Pressure 0.75 in wg Minimum Airflow 33 602 cfm For Cut-Out Height 56 1/2 in For Cut-Out Width 56 1/2 in For Cut-Out Diameter 57 1/2 in Guard Type None Method of Construction Cast Number of Blades 6