Exhaust Fan Assembled Unassembled Blade Diameter 54 in Blade Material Steel Frame Material Steel For Maximum Motor Horsepower 5 hp For Maximum Motor Speed 507 RPM For Minimum Motor Horsepower 1 1/2 hp For Minimum Motor Speed 343 RPM Maximum Airflow 44 535 cfm Maximum Static Pressure 0.75 in wg Minimum Airflow 30 129 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 Stamped Number of Blades 5