Exhaust Fan Assembled Unassembled Blade Diameter 36 in Blade Material Aluminum Frame Material Steel For Maximum Motor Horsepower 5 hp For Maximum Motor Speed 1 166 RPM For Minimum Motor Horsepower 1 hp For Minimum Motor Speed 683 RPM Maximum Airflow 26 979 cfm Maximum Static Pressure 0.75 in wg Minimum Airflow 15 803 cfm For Cut-Out Height 38 1/2 in For Cut-Out Width 38 1/2 in For Cut-Out Diameter 38 1/2 in Guard Type None Method of Construction Cast Number of Blades 6