Thread: Bathroom exhaust fan problem

Originally Posted by PhilipA

The rattling is a characteristic of the motor type and warned about in the manual and on tags on the fan.

It is not a conventional motor like in the previous post. It is brushless and does not have magnets except around the shaft. It only draws about AFAIR 6watts or so, not the 36waatts of a conventional motor.
Regards PhilipA

I had a few of this type, the did rattle on start up and when they got old, but I never noticed any going backwards. I found them to be quite weak so I think they could easily be affected by back draft.

I replaced one in the garage with a strong (300L/s?) one and it can actually suck the internal door to the house closed.