Tubeaxial Fan Drive Type Belt Drive Includes Drive Package Yes Includes Motor Yes Blade Diameter 12 in Nameplate Voltage 115/208-230V AC Phase 1 Motor Horsepower 1/4 hp Airflow @ 0.000 in SP 1 300 cfm Maximum Noise Level @ 5 Feet 19.7 sones Assembly Unassembled For Air Type Flammable Vapor Blade Material Aluminum Housing Material Steel Number of Blades 4 Number of Speeds 1 Motor Enclosure Totally Enclosed Nonventilated Standards AMCA Bolt Circle Diameter 13 1/2 in