More in Ventilation

Draft-Proof Bathroom Fan

Repairing or replacing a damper flap helps reduce drafts on a bathroom exhaust fan


What can I do to make my bathroom exhaust fan draft-proof?

Sandra, Toronto, Ontario


Tom Silva says: A bathroom fan is never going to be 100-percent draft-proof, but it could be that your exhaust fan has lost its damper flap. There is a passage that runs to the exterior of the wall, and as that goes through the wall, inside there's a little damper or flap that covers it. It's not very heavy, but it's heavy enough to keep a major draft from blowing in. When wind wants to blow up it, the wind actually pushes the damper
shut. But if that is missing, you are going to get a lot of air coming
back at you through that passage. Some dampers have louvers instead of a flap, but the same thing will result if a louver is missing or they aren't closing tightly. Either way, you should be able to repair or replace the damper relatively inexpensively.


TV Listings

Find TV Listing for This Old House and Ask This Old House in your area.