I have a bathroom exhaust vent with louvers similar to the image below. It vents out the side of the house above the bathroom between two bedrooms. When it's breezy out, the flaps rattle so that it sounds like we've got critters in the attic. (It was actually pretty freaky to hear, since we had just moved in.) The bathroom fan is never (rarely) used, so I'm certain it's not the cause of the flapping.

So - is this normal and what's a recommended (quieter) alternative which would provide adequate exhaust without allowing pests to enter?

Sub-question - Last year, I blew in 6-8 inches of insulation in the attic. What might be the likelihood of replacing the vent just from the outside without needing to trek up there and disturb/compact all my hard work?


enter image description here

1 Answer 1


I used something like this (4 in. Round Wall Vent). It only flaps when the wind is really blowing. 4 in. Round Wall Vent

Here is another option that should have no clickey clackey at all:

Cape style backdraft damper

cape style backdraft damper 1 cape style backdraft damper 2

  • Thanks. So, you've still got the louvers behind the steel hood? Sep 1, 2015 at 15:45
  • It is one big flap—you can see the bottom of it in the photo. If you want one that has no potential for clickey clackey, try these: conservationmart.com/…. You'd still need some sort of mesh to keep critters out. Sep 1, 2015 at 19:12

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.