Bathroom Vent Flap Noise From Wind

Sometimes wind and roof vents do not get along well.

Bathroom vent flap noise from wind.

This simulates the on state of the fan. This flapping noise comes from the wind blowing from the other side of the house. Often a stiff wind will open vent dampers causing them to periodically clang shut. This noise can get annoying but there is a remedy for it.

This pressurises the house a bit on one side and depressurises it on the side of the exhaust hood. With gusts of wind that causes air to actually move from the house out through this exhaust duct. Hube nov 14 2007. Either apply this thin foam strip to the flap disc or to the edge that the flapper rests on whichever is the easiest.

The noise is because the flapper is hitting on a metal to metal surface. 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. 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.

Easier fix should not interrupt the air flow. 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. Another step would be to alter the angle that the vent is installed. 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.

Same effect occurs when the shower curtain is drawn to you in the shower. 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. There are a couple of things that can help to reduce the problem. If this noise is annoying the flaps can be replaced with ones that are electronically controlled.

By replacing the old flap with one that is weighted or has a spring you can stop the wind from opening the vent flap. Although not the cheapest will solve the problem. If the noise drives you crazy new spring loaded backdraft dampers 9 to 30 depending on the size should solve the problem. 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.