Exhaust Fan Assembled Unassembled Blade Diameter 24 in Blade Material Aluminum Frame Material Steel For Maximum Motor Horsepower 1 hp For Maximum Motor Speed 1 178 RPM For Minimum Motor Horsepower 1/2 hp For Minimum Motor Speed 939 RPM Maximum Airflow 8 115 cfm Maximum Static Pressure 0.75 in wg Minimum Airflow 6 469 cfm For Cut-Out Height 26 1/2 in For Cut-Out Width 26 1/2 in For Cut-Out Diameter 26 1/2 in Guard Type None Method of Construction Cast Number of Blades 6