Roof Fan Motor Conversion Kit, Compatible with Grainger Part Number 43Y140, Motor Horsepower 1/6 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 1/2 in, Application Convert Exhaust Fan to Variable Speed Fan, Current 3.1 A, For Use With 43Y140, Maximum Motor Horsepower 1/5 hp, Motor Enclosure Totally Enclosed, Motor Type Electronically Commutated, Standards cUL, UL