The Suburban 521255 Furnace Motor is a replacement for certain SF-35, SF-42, and SFV-42 Series Suburban RV furnace motors. The furnace motor is attached to the blower wheel and the combustion air wheel. This is a 12V DC power motor with two shafts. Once the control board sends power to the motor, it will start operating which will rotate the shaft attached to both wheels. The Suburban 521255 Furnace more operates at a low noise level and is easy to install. Replaces Suburban 521232 motor. DimensionsMotor Body: 3" dia. x 4"LShaft #1: 2-1/4"L x 5/16" dia. Shaft #2: 1-3/4"L x 5/16" dia. Compatible ModelsSF-35 Series: SF-35FQ, SF-35Q, SF-35VHFQ, SF-35VHQSF-42 Series: SF-42FQ, SF-42Q, SF-42VHFQ, SF-42VHQSFV-42 Series: SFV-42FQ, SFV-42Q, SFV-42VHFQ, SFV-42VHQ 12V DC power motor with two shafts Low noise level Easy to install | Suburban 521255 Replacement Furnace Motor