US Motors Centrifugal Ventilation Direct Drive Blower, 1/2 HP, 1-Phase, 1100 RPM MotorUS Motors Centrifugal Ventilation Direct Drive Blowers are designed to meet manufacturer's requirements for direct drive ventilation units. All blowers are 60 Hz and are Open Air Over (OAO). They feature a shaded pole and permanent split capacitor. 5.0", 5.6" and 6.3" in diameter. Product Specifications BRANDUS Motors MANUFACTURERS PART NUMBER2553 HORSEPOWER1/2 MOTOR RPM 60Hz1100 VOLTAGE115/230 PHASE1 ENCLOSURE TYPEOpen/Drip Proof HERTZ60 RATED RPM1100 MOUNTINGStud INSULATION CLASSB SERVICE FACTOR1 is_motorYes RPM RANGE1001-1100 HERTZ (HZ)60 FL AMPS13.92