Exhaust Fan Assembled Unassembled Blade Diameter 60 in Blade Material Aluminum Frame Material Steel For Maximum Motor Horsepower 15 hp For Maximum Motor Speed 699 RPM For Minimum Motor Horsepower 5 hp For Minimum Motor Speed 485 RPM Maximum Airflow 69 692 cfm Maximum Static Pressure 0.75 in wg Minimum Airflow 48 356 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 Cast Number of Blades 6