Exhaust Fan Assembled Unassembled Blade Diameter 42 in Blade Material Steel Frame Material Steel For Maximum Motor Horsepower 5 hp For Maximum Motor Speed 713 RPM For Minimum Motor Horsepower 3/4 hp For Minimum Motor Speed 380 RPM Maximum Airflow 33 227 cfm Maximum Static Pressure 0.75 in wg Minimum Airflow 17 709 cfm For Cut-Out Height 44 1/2 in For Cut-Out Width 44 1/2 in For Cut-Out Diameter 44 1/2 in Guard Type None Method of Construction Stamped Number of Blades 5