Bathroom Exhaust Duct In Attic

It cannot move air to a crawlspace or attic.

Bathroom exhaust duct in attic. It may also violate a shingle warranty. One attic mounted fan for two bathrooms one in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms. Another consideration to think about is the placement of your fan. 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.

See bathroom vent duct termination for details about how to terminate the bath exhaust vent duct. 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. 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.

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. Example model ventilation codes. It is because of this that many builders tend to advise against this method. If you have a bathroom with a separate enclosed toilet you ll also need an additional fan for that space.

Ceiling fans vent either into the attic or outside through the roof. In order to accomplish this the roof has to have a hole cut in it. Exhaust air from toilet rooms and bathrooms shall not discharge into attic crawl space or other areas inside building. T he result of the insulation problem around a bathroom exhaust fan is either water stains or mold near the vent of your bathroom.

Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside. While this may seem obvious homeowners may out of convenience direct the vent into either of these locations. If you have two bathrooms that are close together and one has an exhaust fan and the other doesn t you might be wondering if you can tie a new exhaust duct into the existing one. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof.

No you cannot vent your bathroom exhaust fan into the attic. Insulation problems will lead to other problems like the fan not being able to extract any humidity from the bathroom at all.