Bathroom Vent Flap Noise From Wind

This simulates the on state of the fan.

Bathroom vent flap noise from wind.

When the gust of wind stops the velocity of air by the vent reduces to zero and the pressure increases thus suddenly stopping the flow of air and making the flapper close hard enough to be heard. Hube nov 14 2007. Those others are roof attic vents. This noise can get annoying but there is a remedy for it.

Same effect occurs when the shower curtain is drawn to you in the shower. Although not the cheapest will solve the problem. The flap still moved when the wind is blowing. Noise is often a problem unfortunately which is caused by the flaps that close the vent off when the fan is inactive.

Four bolts were put through the flap towards the bottom to add weight to prevent flap from open so often and reduce the angle of swing and electrical tape was applied where the flap contacts the body of the vent to soften the noise. This pressurises the house a bit on one side and depressurises it on the side of the exhaust hood. There are a couple of things that can help to reduce the problem. Sometimes wind and roof vents do not get along well.

With gusts of wind that causes air to actually move from the house out through this exhaust duct. The flapper should have a thin piece 1 8 of foam stripping to sit on when closed this foam strip will stop the noise considerably. The vent hood ducts through a rigid or flexible pipe to a cap on the roof or side of your home. If the noise drives you crazy new spring loaded backdraft dampers 9 to 30 depending on the size should solve the problem.

By replacing the old flap with one that is weighted or has a spring you can stop the wind from opening the vent flap. If you hear a banging noise coming through your bathroom vent when it is windy chances are that the wind is picking up the vent flap and then letting it bang closed. If this noise is annoying the flaps can be replaced with ones that are electronically controlled. Another step would be to alter the angle that the vent is installed.

The noise is because the flapper is hitting on a metal to metal surface. Putting a magnet on may cause recir of the humidity from the vent. This flapping noise comes from the wind blowing from the other side of the house. Easier fix should not interrupt the air flow.