How To Vent Bathroom Exhaust Fan In Attic

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How to vent bathroom exhaust fan in attic.

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. A grille in each bathroom attaches to ducts which then fasten to a y connector at the fan. You mount a switch in each bathroom. No you cannot vent your bathroom exhaust fan into the attic.

A single exhaust exits through the roof figure a. Options for venting a bathroom exhaust fan include best to worst. This involves running ductwork from the fan usually though an attic and out through the roof. The manufacturer will give guidance on the total duct length permitted.

It is because of this that many builders tend to advise against this method. 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. Either way the vent will have to go directly to the outside and installed with a vent hood cover. You should never exhaust the bathroom fan directly into the attic.

Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons. Although this isn t always possible in attic crawl spaces you should always insulate the duct to prevent condensation problems. Duct already wrapped in insulation at home centers. Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.

Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. This system is quiet too. Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside. Because the fan is in the attic you ll hardly hear it.

The correct way to vent a bathroom fan through an attic is to terminate the vent either to the roof or to the gable wall. 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. Look for the special fans starting at 160 at heating cooling equipment dealers. Through the roof or an exterior gable wall.

The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood.