Roof Fan Motor Conversion Kit Compatible with Grainger Part Number 16D525 1MBE9 3ATU2 4HZ43 4HZ52 4YY144HZ55 4YY17 Motor Horsepower 1 hp Maximum Motor Speed 1 725 RPM Minimum Motor Speed 300 RPM Nameplate Voltage 115V AC Phase 1 For Fan Type Upblast Fans Shaft Diameter 5/8 in Application Convert Centrifugal Upblast Exhaust Ventilator to Energy-Efficient Variable Speed Direct-Drive Upblast Exhaust Ventilator Current 12.4 A