Exhaust Fan Assembled Unassembled Blade Diameter 42 in Blade Material Aluminum Frame Material Steel For Maximum Motor Horsepower 5 hp For Maximum Motor Speed 903 RPM For Minimum Motor Horsepower 1 hp For Minimum Motor Speed 605 RPM Maximum Airflow 30 825 cfm Maximum Static Pressure 0.75 in wg Minimum Airflow 20 652 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 Cast Number of Blades 6