Tubeaxial Fan Drive Type Belt Drive Includes Drive Package Yes Includes Motor Yes Blade Diameter 18 in Nameplate Voltage 208-230/460V AC Phase 3 Motor Horsepower 1 1/2 hp Airflow @ 0.000 in SP 5 298 cfm Maximum Noise Level @ 5 Feet 38 sones Assembly Unassembled For Air Type Clean Air Blade Material Aluminum Housing Material Steel Number of Blades 6 Number of Speeds 1 Motor Enclosure Totally Enclosed Fan Cooled Standards AMCA Bolt Circle Diameter 19 7/8 in