Air coming out of dryer when bathroom fan is on
Turning on the bathroom fan pulls air backwards into the house through the dryer's lint filter. When both appliances run simultaneously, this airflow causes fog and heavy condensation to build up inside the bathroom.
What the numbers show
Counted from the threads quoted below. How we count
- People have been saying this in most months since September 2026.
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.
Air coming out of dryer when bathroom fan is on
- 1Using a coil brush to manually scrape thick debris off the fins.Did this help you?
- 2Removing the outer casing and spraying the coils from the inside out with a low-pressure garden hose.Did this help you?
- 3Using aerosol-type condenser coil cleaners and a pump sprayer.Did this help you?
- 4Relocating the dryer vent so it exhausts elsewhere.Did 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 went to cover the top of my daughters unit (from leaves) and when I looked closer there’s all kinds of debris and dryer lint in the fins because her dryer vent I right there. I took the sides off and used a brush to get the stuff off but the fins are so dirty.”source ↗
“I am going out to check my own condensers here at my house because my 2 units are on either side of my dryer vent also!! It’s wild.”source ↗
“When I turn on the bathroom exhaust fan, I can feel air coming out through the dryer lint filter area, even though the dryer is not running.”source ↗
“Also, when I run the dryer and bathroom exhaust fan at the same time, the bathroom starts getting foggy/condensation builds up.”source ↗