Whitfield Pellet Stove Room Air Convection Blower Fan - 12146109, 12126109 . Ultra Quiet Engineering If you want Peace and Quiet with Low Vibration You found the right motor. This motor is so quiet; you won t know your stove is on. NBK uses the highest standards of engineering with parts calibrated within 1/10,000th of an inch. The room for error is so small is has to be checked using a microscope. This motor is designed for Variable Speed which requires high quality electronic components not included in other motors. High temperature rubber bushings and washers are used to Damper Vibration. Heat Reduction NBK Exhaust Motors are tested to run 24/7 in hot and dusty atmospheres. Internal cooling fan designed for heat reduction. Calibrated for high stress operations which keeps the motor cooler and makes it last longer. This combined with Ultra Quiet Engineering results in a motor that lasts a very long time while remaining quiet.