Exhaust Fan Assembled Unassembled Blade Diameter 30 in Blade Material Steel Frame Material Steel For Maximum Motor Horsepower 1 hp For Maximum Motor Speed 968 RPM For Minimum Motor Horsepower 1/4 hp For Minimum Motor Speed 621 RPM Maximum Airflow 11 061 cfm Maximum Static Pressure 0.75 in wg Minimum Airflow 7 096 cfm For Cut-Out Height 32 1/2 in For Cut-Out Width 32 1/2 in For Cut-Out Diameter 32 1/2 in Guard Type None Method of Construction Stamped Number of Blades 6