Bathroom Vent Discharge Into Attic

Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof.

Bathroom vent discharge into attic. Options for venting a bathroom exhaust fan include best to worst. Through the roof or an exterior gable wall. 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.

Each fan vents separately out the roof. Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside. Leaking and damaged vents as well as improperly installed ones also can cause problems. One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms.

Each bathroom has its own exhaust fan. Exhaust air from toilet rooms and bathrooms shall not discharge into attic crawl space or other areas inside building. Health and structural issues when a bathroom is not vented properly. Now where the discharge point is is going to be up to you.

The bath should be vented by either a 20 cfm continuous vent fan or a 50 cfm vent fan that is intermittent or switched. If you re simply replacing the fan the ducts should already be set up for you. M1507 2 exhaust air from bathrooms and toilet rooms shall not discharge into an attic crawl space or other areas inside the building. When venting a bathroom exhaust fan make sure to vent the air to the outside rather than into your attic where it can cause mold and mildew to form.

Allowing the exhaust to vent into your attic can potentially cause several moisture problems. Exhausting of the bath vent fan must indeed be to the building exterior. M1501 1 air shall not be exhausted into an attic soffit ridge vent or crawl space. A lot of options.

In order to accomplish this the roof has to have a hole cut in it. Rusted fixtures condensation from moisture laden air can cause health and structural problems as well especially when the bathroom vents discharge moist air into attics or crawl spaces. 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. That will take it from the bath exhaust fan to a discharge point.

Both bathrooms are vented by a single in line fan that has one exhaust vent running through the roof. This involves running ductwork from the fan usually though an attic and out through the roof. Sizing a bathroom fan can be somewhat tricky as the information out there is all over the place. No you cannot vent your bathroom exhaust fan into the attic.

The next thing you need to do is make sure the exhaust is successfully making its way out of your home.