High Pitched Noise from Exhaust Fan When Off


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Old 06-04-21, 10:19 AM
J
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High Pitched Noise from Exhaust Fan When Off

One of my bathroom exhaust fans makes a loud high pitched squealing sound at times when it is off. There are 3 bathrooms total in the house. It is only one on particular that does this. The only constant I see is that it is usually at least somewhat windy outside when this happens. The house is only 12 years old so my thinking is that it's not an age thing. Any ideas? The fan also still works fine.
 
  #2  
Old 06-04-21, 11:36 AM
P
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You might be onto something with the wind. I would first check to see if the damper at the fan is opening and closing properly. Then I'd check where it exhausts outside to see if that damper is also closing.
 
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