Exhaust Fan Assembled Unassembled Blade Diameter 60 in Blade Material Steel Frame Material Steel For Maximum Motor Horsepower 10 hp For Maximum Motor Speed 496 RPM For Minimum Motor Horsepower 2 hp For Minimum Motor Speed 290 RPM Maximum Airflow 66 186 cfm Maximum Static Pressure 0.75 in wg Minimum Airflow 38 697 cfm For Cut-Out Height 62 1/2 in For Cut-Out Width 62 1/2 in For Cut-Out Diameter 63 1/2 in Guard Type None Method of Construction Stamped Number of Blades 5