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sross002
Noise from Bathroom Exhaust Fan

There is a high-pitched noise coming from my bathroom exhaust fan. The noise squeals like air escaping from a balloon, it is high-pitched and mimics built-up pressure being released. It happens sporadically throughout the day and how long it lasts is also sporadic. There is no rhyme or reason for the timing of the noise. It is not electrical, as this happens while the unit is unplugged and when it is switched off.
I have a video that I recorded that will describe the noise better. If you care to see/ hear it, I can send it in a reply email or text.

dj1
Re: Noise from Bathroom Exhaust Fan

Can you tell us about the vent: what kind of vent you have, does it go through the roof, does it have a vent cover outside, etc.

remodeled cotta...
Re: Noise from Bathroom Exhaust Fan
sross002 wrote:

There is a high-pitched noise coming from my bathroom exhaust fan. The noise squeals like air escaping from a balloon, it is high-pitched and mimics built-up pressure being released. It happens sporadically throughout the day and how long it lasts is also sporadic. There is no rhyme or reason for the timing of the noise. It is not electrical, as this happens while the unit is unplugged and when it is switched off.
I have a video that I recorded that will describe the noise better. If you care to see/ hear it, I can send it in a reply email or text.

I have exactly the same problem - high pitched continuous noise from a bathroom ceiling fan, whether it is on or not. It is unchanged even when I shut down the power in the entire house at the Main! Not coming from any water lines - I've run them all. Just constant from the fan and LOUD! Stated 2 hours ago and remains unchanged. Vent to the outside is short and direct, only 5' long and clear. It is not windy out. This is a new unit - just 3 years old. HOW can it be making noise without power??

ed21
Re: Noise from Bathroom Exhaust Fan

Exhaust fans have a flapper valve in the fan body and one where it exits the building. I would check these areas first.
Any devices creating negative pressure in the house? It's a real puzzler.:confused:

A. Spruce
Re: Noise from Bathroom Exhaust Fan
ed21 wrote:

Exhaust fans have a flapper valve in the fan body and one where it exits the building. I would check these areas first.
Any devices creating negative pressure in the house? It's a real puzzler.:confused:

I'm betting on this, the flapper in the exterior vent hood. While I've never had a bath fan do this, I did have a kitchen exhaust fan that did. Here's a clue that it's the exterior vent, pay attention to whether or not it is windy outside when you hear the noise. Yep, wind can vibrate the flapper, which is likely your problem.

Richard
Re: Noise from Bathroom Exhaust Fan

This specific problem has been solved by now, but a screaming noise in a ceiling might be coming from the pipes for fire sprinklers. Even a fire sprinkler company inspector (no doubt a rookie) failed to figure this out for me, but his merely doing a "flow test" (opening the valve to the exit pipe out of the house) solved the problem--despite his departing opinion that "it isn't your sprinkler system." Just letting some water out might unplug some pipe and relieve the noise. Caution: this will set off your alarm, so notify monitor. I plan to do this every 6-12 months. https://homefiresprinkler.org/flow-testing-your-fire-sprinkler-system/

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