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


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Old 02-08-17, 04:39 PM
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Question 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!
 
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Old 02-08-17, 04:42 PM
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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.
 
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Old 02-09-17, 09:14 AM
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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:
 
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Old 02-09-17, 11:13 AM
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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.
 
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Old 02-09-17, 11:16 AM
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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
 
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Old 02-09-17, 12:05 PM
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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.
 
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Old 02-09-17, 12:35 PM
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Czizzi is correct. That is my problem. The roof vent has a flap facing the weather side.
 
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Old 02-09-17, 12:43 PM
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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.
 
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Old 02-09-17, 05:01 PM
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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.
 
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Old 02-09-17, 05:55 PM
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At the risk of being redundant... put a rubber bumper on the flapper.
 
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Old 02-22-17, 09:19 AM
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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?
 
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Old 02-22-17, 09:34 AM
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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.
 
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Old 02-24-17, 04:44 PM
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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.
 
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Old 02-25-17, 11:06 AM
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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?
 
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Old 02-25-17, 01:05 PM
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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.
 
 

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