Why is my bathroom exhaust fan making a strange noise?
Bathroom ventilation fans can suddenly start producing strange, on-and-off noises that persist for hours. This leaves homeowners unsure of what is wrong or how to diagnose the underlying mechanical issue.
What the numbers show
Counted from the threads quoted below. How we count
- The most recent one is from October 2026.
- This comes up 23.7× more often in r/homeowners than across the site as a whole.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1venting out the wall above the condenserDid this help you?
- 2leaving the window crackedDid this help you?
- 3Buying the cheapest, contractor-grade store brand fansDid this help you?
- 4Using a white noise machine or playing musicDid this help you?
- 5Installing a solid core doorDid this help you?
- 6Adding a recordable sound chip or white noise device near the ventDid this help you?
- 7Gluing a small plastic tab to the housing to touch the bladesDid this help you?
- 8venting through the roof instead of the soffitDid this help you?
- 9venting through a vertical wallDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“I have no idea how to look for this online. Seems like every good bathroom fan is marketed as being super quiet. I can't be the only one who thinks that's actually a huge negative. Half the function of the bathroom fan is to produce noise.”source ↗
“In a small apartment with the bathroom close to the living room, the 50 year old industrial fan provided camoflauge for shy dates and lowered the risk of them overhearing me and running for the hills.”source ↗
“When we redid our bathroom, our builder got us a “whisper quiet “ fan. After a month, you couldn’t hear yourself think.”source ↗
“Can anyone tell me what’s wrong and what this noise could be please? It’s been doing this on and off for about 2hours..🙏🏼😭”source ↗
“I’m looking for advice on the best way to vent a bathroom exhaust fan. I’d prefer to vent through the soffit rather than the roof because I really don’t want to cut through relatively good shingles and create another potential leak point.”source ↗
“My main concern with a soffit vent is whether humid bathroom air can get pulled back into the attic through nearby soffit intake vents.”source ↗
“Remodeling a small bathroom and wanted to add a ventilation fan. After demo, I realized my only options are venting above a window (and through the header above) or directly above the AC condenser.”source ↗
“Would above the condenser lead to issues? Not sure what the best move is here”source ↗
Where this came up
People with this problem also raised
- 3Loud noise from passenger dashboard when turning air to max
- 5Bathroom exhaust fans that plug in
- 8Why does my ceiling fan keep clicking?
- 2Should I retrofit a bathroom exhaust fan or replace the whole unit?
- 2Why does my bathroom mirror still fog up when the exhaust fan is running?
- 2How to vent a ceiling bathroom fan through a snowy roof