How Do I Vent Out Attic From Bathroom Fan Through

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.

How do i vent out attic from bathroom fan through.

From outside use 4 inch hole saw to cut hole for wall cap. This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo. Use rigid metal ducting aluminum or galvanized steel with lengthwise seams facing up and joints sealed with foil tape or duct mastic or rigid plastic pipe. The lower half of the flange sits on top of the shingles.

In this video this old house general contractor tom silva explains how to vent a bathroom fan. No you cannot vent the bathroom exhaust fan into the soffit vents. Slide the vent under the shingles so they cover the top half of the vent flange. 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.

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. You mount a switch in each bathroom. Nail the lower corners with roofing nails and tar the heads. Apply a bead of asphalt roof cement on the bottom of the vent.

Options for venting a bathroom exhaust fan include best to worst. Drive nail through house wall from attic. Through the roof or an exterior gable wall. If you vent the bathroom exhaust fan to close to the soffit vents which are vented plates under your homes outer edge and roof your home the air can be sucked right back into the attic from the soffit.

This system is quiet too. This involves running ductwork from the fan usually though an attic and out through the roof. It is because of this that many builders tend to advise against this method. A single exhaust exits through the roof figure a.

Either way the vent will have to go directly to the outside and installed with a vent hood cover. 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. If you vent through a soffit where attic vents are often located the moisture will get sucked back up into the attic or roof venting. A grille in each bathroom attaches to ducts which then fasten to a y connector at the fan.

This will serve as a reference point for positioning the wall cap.