Tubeaxial Fan Blade Diameter 12 in Maximum Motor Horsepower 3/4 hp Minimum Motor Horsepower 1/4 hp Maximum Motor Speed 2 877 RPM Minimum Motor Speed 1 670 RPM Maximum Airflow 2 432 cfm Minimum Airflow 1 300 cfm Maximum Static Pressure 1 in wc For Air Type Clean Air Assembly Unassembled Blade Material Aluminum Housing Material Steel Number of Blades 4 Standards AMCA Sound and Air Bolt Circle Diameter 13 1/2 in Includes Drive Package No Includes Motor No Bearing Type Ball Bearing