The fan in the kitchen of our 3670 was a Fantastic fan, but the bath and bedroom were the cheap, noisy ones that interfered with the TV signal. Replaced the bedroom with a Heng Vortex multi speed and the bath with a Heng single speed. Easy enough to do. But I did strip parts and motors from the OEM’s. The on/off button from one was actually used to replaced a faulty switch in one of the wall sconces in the living room.
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