Bathroom Vent Discharge Into Attic

So what you want to do is you want to install a duct a vent duct and you can use flex duct for this.

Bathroom vent discharge into attic. Through the roof or an exterior gable wall. Each bathroom has its own exhaust fan. Leaking and damaged vents as well as improperly installed ones also can cause problems. M1507 2 exhaust air from bathrooms and toilet rooms shall not discharge into an attic crawl space or other areas inside the building.

Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside. A lot of options. The next thing you need to do is make sure the exhaust is successfully making its way out of your home. No you cannot vent your bathroom exhaust fan into the attic.

It is because of this that many builders tend to advise against this method. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. Both bathrooms are vented by a single in line fan that has one exhaust vent running through the roof. Now where the discharge point is is going to be up to you.

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. Each fan vents separately out the roof. Exhaust air from toilet rooms and bathrooms shall not discharge into attic crawl space or other areas inside building. In order to accomplish this the roof has to have a hole cut in it.

The exhaust needs to vent outdoors. One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms. The bath should be vented by either a 20 cfm continuous vent fan or a 50 cfm vent fan that is intermittent or switched. This involves running ductwork from the fan usually though an attic and out through the roof.

You should never exhaust the bathroom fan directly into the attic. It may also violate a shingle warranty. Health and structural issues when a bathroom is not vented properly. Allowing the exhaust to vent into your attic can potentially cause several moisture problems.

If you re simply replacing the fan the ducts should already be set up for you. Sizing a bathroom fan can be somewhat tricky as the information out there is all over the place. Options for venting a bathroom exhaust fan include best to worst. M1501 1 air shall not be exhausted into an attic soffit ridge vent or crawl space.

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.