Nutone 99080484 BROAN-NUTONE Fan Motor For L250 Ventilator 3.3 inch diameter motor Shaft size 5/16" x 1 1/4"; rotation CCW Motor case length 3 inch 4 studs on back 1 year manufacture warranty Nutone 99080474 Broan S150, S150L Vent Fan Motor # 1675 Rpm, 1.2 Amps, 115V 60Hz