Bathroom Vent Flap Noise From Wind

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.

Bathroom vent flap noise from wind. There are a couple of things that can help to reduce the problem. Hube nov 14 2007. The noise is because the flapper is hitting on a metal to metal surface. With gusts of wind that causes air to actually move from the house out through this exhaust duct.

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. Putting a magnet on may cause recir of the humidity from the vent. Although not the cheapest will solve the problem. This pressurises the house a bit on one side and depressurises it on the side of the exhaust hood.

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. If the noise drives you crazy new spring loaded backdraft dampers 9 to 30 depending on the size should solve the problem. Either apply this thin foam strip to the flap disc or to the edge that the flapper rests on whichever is the easiest. Sometimes wind and roof vents do not get along well.

The flap still moved when the wind is blowing. Same effect occurs when the shower curtain is drawn to you in the shower. Often a stiff wind will open vent dampers causing them to periodically clang shut. You are probably better of putting a stick on felt pad on the flap itself so that when it does bang it is more muffled.

This noise can get annoying but there is a remedy for it. Noise is often a problem unfortunately which is caused by the flaps that close the vent off when the fan is inactive. Another step would be to alter the angle that the vent is installed. This simulates the on state of the fan.

The vent hood ducts through a rigid or flexible pipe to a cap on the roof or side of your home. By replacing the old flap with one that is weighted or has a spring you can stop the wind from opening the vent flap. This flapping noise comes from the wind blowing from the other side of the house. Easier fix should not interrupt the air flow.