Roof Vent Flaps In Wind

We had a satisfied customer submit this video to us to prove a point.

Roof vent flaps in wind.

Keep in mind that wind blowing across a vent opening creates a vacuum the faster things blow thus creating flap rattles as the wind gusts. Mounting the damper inside the vent protects it from damage and prevents noisy flapping from wind as well as better airflow. Often a stiff wind will open vent dampers causing them to periodically clang shut. Lift up the edges of the surrounding roof.

This flapping noise comes from the wind blowing from the other side of the house. Cheap metal vents can be very loud and obnoxious in the wind. This video is my attempt at keeping mine from clanging in the wind. Set the screw aside for reuse later.

The vent in the video is. This is usually just a few screws. Vertical vents were a source of whistles and banging flappers. With gusts of wind that causes air to actually move from the house out through this exhaust duct.

Disconnect the vent tube from the problem vent in the attic. When the vent hood fan turns on the air pressure rushing out forces the vent to open breaking the magnetic force holding the flapper closed. The vent hood ducts through a rigid or flexible pipe to a cap on the roof or side of your home. This pressurises the house a bit on one side and depressurises it on the side of the exhaust hood.

If the noise drives you crazy new spring loaded backdraft dampers 9 to 30 depending on the size should solve the problem. A noisy vent cover. When the vent hood fan is shutoff and the airflow diminishes and the flapper begins to close. These types of vents are easy to remove and clean which prevents clogging.

This is one that has been bothering me and a lot of my neighbors. There are a couple of things that can help to reduce the problem. This actually seemed to work pretty well. Sometimes altering the cap on the vent reduces the vacuum.

Climb onto the roof and locate the vent that is causing the noise.