Bathroom Vent Into Attic

However there are a few real potential downsides when a bathroom vent is improperly terminated inside an attic. This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo. This section notes that air exhausted from the bathroom must be sent outdoors not indoors to the same residence or indoors to any other dwelling unit.

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A lot of options.

Bathroom vent into attic. If you re simply replacing the fan the ducts should already be set up for you. So what you want to do is you want to install a duct a vent duct and you can use flex duct for this. It may also violate a shingle warranty.

This is much easier to do if you have attic access because if you don t you usually have to remove some ceiling drywall and run the ducts along a joist. Allowing the exhaust to vent into your attic can potentially cause several moisture problems. Bathroom vent fan codes venting into attic mold structural issues bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.

The exhaust needs to vent outdoors. Note that a quick call or visit. Mold growth wood rot and structural deterioration moist bathroom air is sucked back into the home interior excess moisture attracting rodents and pests.

But while you can t have two fans with one vent you can make one fan and one vent serve two bathrooms. Now where the discharge point is is going to be up to you. The building code requires a bathroom exhaust fan to vent outside the building so installation of a new bathroom fan necessarily involves installation of ductwork.

That will take it from the bath exhaust fan to a discharge point. Venting a bathroom exhaust fan into your attic is never a good idea here are three better options. A grille in each bathroom attaches to ducts which then fasten to a y connector at the fan.

Dumping bathroom exhaust into an attic or under roof space invites costly mold contamination frost under the roof in freezing climates moisture damage to roof sheathing possibly even plywood delamination or rot roof failures and shorter roof shingle life. If you vent the bathroom exhaust fan to close to the soffit vents which are vented plates under your homes outer edge and roof your home the air can be sucked right back into the attic from the soffit. While this may seem obvious homeowners may out of convenience direct the vent into either of these locations.

No you cannot vent the bathroom exhaust fan into the soffit vents. It cannot move air to a crawlspace or attic. Building codes prohibit bathroom vent fans from terminating or exhausting into.

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