Bathroom vent flap making a lot of noise when windy - took video - suggestions?

Hello,
All of the vents in the bathrooms of the entire house make a lot of noise when its windy outside, which is supposedly very common.

However, this noise echoes throughout the entire house, and I definitely can't get used to the sound, so I want to come up with a solution.

Here is a video of where the noise is coming from: All I did was remove the vent fan in the bathroom to expose this:
https://goo.gl/photos/rCi3wFULUQeRbGh7A What do you think might be a good way to quiet this thing down? I was thinking of adding a small weight to the bottom of the vent flap (sandwhich a magnet to it?) to maybe try and hold it down better, but I am not sure. Whatever I try, it can't be held down too much or it won't open when I turn the vent fan on.

Any help or advice is greatly appreciated, thanks!

 

I have the same problem. But my noise is at the roof pipe vent. The opening faces the wind side. I thought about putting a very weak spring. I just got use to it. Not worth the hassle of try to fool with it.

 

This is definitely too loud and too frequent to ever get used to.

I uploaded 2 photos showing how its vented outside. I believe the vents to be the shiny silver boxy ones:

 

I don't think so. The one on the far left is most likely the bathroom fan vent, but the picture is hard to see detail. Those others are roof/attic vents.

 

Putting a magnet on may cause recir of the humidity from the vent. 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. Easier fix, should not interrupt the air flow

 

Bathroom ceiling fans are supposed to have a damper on the unit itself. If your damper is on the roof vent that would be part of the cause.

 

Czizzi is correct. That is my problem. The roof vent has a flap facing the weather side.

 

This is probably as simple as putting a couple rubber bumpers on the corners of the roof flapper. The round kind like what's on the back of a cabinet door.

 

Exactly. It is the bathroom fan vent.

The bathroom fan vents are what is making the noise... not anything on the roof. The video I took is of the bathroom fan vent.

 

At the risk of being redundant... put a rubber bumper on the flapper.

 

So I contacted the builder, and they said its normal for them to flap like that in the wind and there isn't anything else they can do with them.

Wouldn't a rubber bumper prevent it from closing all the way?

 

Yes. If you must stick a piece of felt under the flap. It won't last forever. You'll need to replace t every year or so.

 

I usually install a 5C523 backdraft damper in the duct between the vent and the outlet. The damper should be installed in a vertical section of the 4 inch duct.

I usually only need a pocket knife and some foil tape to install the damper since the duct is usually only thin aluminum.

 

Do you remove the flapper that's next to the vent motor and then install this flap/damper? Or do you leave the other one in place and add an additional flap/damper?

 

I leave the existing damper in place.

The backdraft dampers at Grainger come in even numbers. The most common size is the 4 inch 5C523. It is spring closed and has a gasket but it must be installed vertically so that gravity helps it close.

Install it in the vent duct in the attic.