Seal Gap Around Bathroom Exhaust Fan

Using a saw cleanly cut all a hole in the ceiling drywall no more than 1 inch larger in diameter than the fan box. I ve got my exhaust fan installed in the ceiling of the bathroom now i m wonder how best to seal the gap around it. On occasion a home improvement enthusiast may discover that the opening cut in the drywall to install a bath fan is not completely covered by the fan s.

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Before entering the shower set the timer switch for about ten or 15 minutes longer than you ll be in the shower.

Seal gap around bathroom exhaust fan.

I use the minimum amount of caulk to fill the gap and seal the housing to the drywall. There will be residual caulk if the bead is cut but the bead is hidden under the fan grill. In all likelihood you will never have to uninstall a high quality bath fan once it goes in. Bath exhaust fan with rigid foam box image courtesy of the doe 3.

The fan housing is obviously sheet metal and the ceiling has the plastic vapor barrier on top of the drywall. Cut an access in the box for the exhaust duct. Which isn t to say you couldn t use rope caulk instead of tube caulk. How to patch drywall around a bath fan.

Venting a bath fan into an open attic is a recipe for rot mold and other issues. Similar to a dryer exhaust bath fans should vent outside. Fully insulated bath exhaust fan image courtesy of the doe summary. One great and inexpensive addition is a simple timer switch.

Seal the box to the ceiling gypsum board and seal around the exhaust duct with caulk or canned spray foam. Air seal around kitchen and bathroom exhaust fans to keep conditioned air from leaking into unconditioned space. Cover the box with attic insulation.

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