Ultra Quiet motor designed by Fasco>>>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. Estimated Lifespan: 15-20 years. Fasco 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. Your new 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. Go Green. In accord with new environmental standards your new motor is more efficient so it cost less to run. Heat Reduction>>>> FascoExhaustMotors are tested to run 24/7 in hot and dusty atmospheres. Your new motor has a 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.