WhisperCeiling Panasonic Bath Ventilation FanThese Fans are designed to give you continuous, trouble free operation for many years thanks in part to its high quality components and permanently lubricated motors. Also, since heat is always detrimental to motor life, we designed the electrical configuration of this model's condenser motor to allow it to operate at lower temperatures, increasing the life of the motor and bearings, as well as manufacuring the housing out of heavy gauge zinc