Morrill Solid State Unit Bearing Fan Motor - 35/50 Watts 208-230 VoltsDirect Drop-In Replacement for Motors 35 to 50 Watts OutputRotation is determined by viewing opposite shaft end35 - 50 WattsUltimate commutated technologyUnit bearing construction100% performance testedConstant 1550 RPM operating speed is identical on either 50 or 60 HertzConstant 1550 RPM regardless of fluctuations in voltagePeak efficiencies in excess of 80% means lower operating temperatures andextended motor lifeUL recognized and electronically protected