Bathroom Exaust Into Attic

Through the roof or an exterior gable wall.

Bathroom exaust into attic.

Exhaust air from toilet rooms and bathrooms shall not discharge into attic crawl space or other areas inside building. There are several other factors to consider for proper ventilation such as. While this may seem obvious homeowners may out of convenience direct the vent into either of these locations. An enclosed toilet would require its own exhaust fan exhaust fans approved for installation in wet areas would need to be located over or near the shower or tub bathroom doors should have at clearance to the floor.

It cannot move air to a crawlspace or attic. Although this isn t always possible in attic crawl spaces you should always insulate the duct to prevent condensation problems. 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. You can find 4 in.

It may also violate a shingle warranty. 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. That will take it from the bath exhaust fan to a discharge point. It is because of this that many builders tend to advise against this method.

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. Now where the discharge point is is going to be up to you. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. This involves running ductwork from the fan usually though an attic and out through the roof.

Options for venting a bathroom exhaust fan include best to worst. 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. Exhausting of the bath vent fan must indeed be to the building exterior. The bath should be vented by either a 20 cfm continuous vent fan or a 50 cfm vent fan that is intermittent or switched.

Duct already wrapped in insulation at home centers. 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.