Tubeaxial Fan Drive Type Direct Drive Includes Drive Package Yes Includes Motor Yes Blade Diameter 12 in Nameplate Voltage 115V AC Phase 1 Motor Horsepower 1/4 hp Airflow @ 0.000 in SP 1 627 cfm Maximum Noise Level @ 5 Feet 17.1 sones Assembly Assembled For Air Type Clean Air Blade Material Aluminum Housing Material Steel Number of Blades 4 Number of Speeds 2 Motor Enclosure Totally Enclosed Air Over Standards AMCA Sound and Air UL Listed Bolt Circle Diameter 13 1/2 in