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 Cut-Out Height 50 1/2 in For Cut-Out Width 50 1/2 in For Cut-Out Diameter 50 1/2 in Guard Type None Method of Construction Cast Number of Blades 6