How Do I Vent Out Attic From Bathroom Fan Through

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

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. 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. Nail the lower corners with roofing nails and tar the heads.

In order to accomplish this the roof has to have a hole cut in it. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. This system is quiet too. This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo.

You mount a switch in each bathroom. A single exhaust exits through the roof figure a. Apply a bead of asphalt roof cement on the bottom of the vent. A grille in each bathroom attaches to ducts which then fasten to a y connector at the fan.

It is because of this that many builders tend to advise against this method. 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. Either way the vent will have to go directly to the outside and installed with a vent hood cover. No you cannot vent the bathroom exhaust fan into the soffit vents.

Drive nail through house wall from attic. From outside use 4 inch hole saw to cut hole for wall cap. In this video this old house general contractor tom silva explains how to vent a bathroom fan. 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. Slide the vent under the shingles so they cover the top half of the vent flange. 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. 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.