Maintenance-free, direct-drive, totally enclosed heavy-duty motor is thermally protected with pre-lubricated ball bearings. Patented, safe non-restrictive fan guards and solid PVC shroud. Galvanized fan blade. Low noise levels. U.S.A. Speed RPM 825, Fan Diameter in. 36, HP 1/2, Volts 115/230, Amps 6.0/3.5, Dimensions L x W x H in. 37 1/2 x 37 1/2 x 16 1/2, Air Delivery CFM 12,709.