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Thx-everything was clean when I re-installed the unit. This morning when I got up no knocking sound was noticeable. On your advice I will keep an eye. I hope that was not wasted money, since the old...

Nutone QT-110N-B is the appliance model and yes, I just replaced the motor and cleaned the whole thing. Thanks.

I just replaced my bathroom fan motor, which had become very noisy. The new motor is much quieter, but still produces a knocking sound at about 90/minute at even intervals.

Is it possible that the...

I just experienced the same thing and replaced my bathroom fan motor, which had become very noisy. The new motor is much quieter, but still produces a knocking sound at about 90/minute at even...