Vent Bathroom Fan Through Existing Roof Vent

The 2nd bathroom vent drips on the floor and is ruining the ceiling.

Vent bathroom fan through existing roof vent.

See below for a shopping list and tools subscribe. This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo. The 2 pipes one a 4 master and the other a 3 2nd do not go through the ceiling but into a common box that goes through the roof. A grille in each bathroom attaches to ducts which then fasten to a y connector at the fan.

The bathroom fan vent was run to the outside of the house but was removed as the addition surrounded vent. It is really a matter of choice as to where the bathroom fan is vented to the outside as long as it exhausts directly outside. You can find 4 in. 1 answer from this member.

This old house general contractor tom silva shows how to properly install a roof mounted bath fan vent. It is best to install a fan to it s own dedicated roof vent. The existing vent is louvered with a screen behind it. The master bathroom and the 2nd bathroom vent through the roof and through the same opening.

The good majority of bathroom fans are vented through the roof while some people are choosing to soffit vent them as an alternate. The contract nicely wrapped the exhaust hose around the fan and installed the roofing with out re plumbing it. All the floor joists have some kind of wiring or vents running through them. If you re tempted to vent your exhaust fan through an existing roof vent or even vent it into the attic don t do it.

A single exhaust exits through the roof figure a. As a slant back vent the original photo shows it installed backwards. Warm moist bathroom air will condensate on its underside and can cause moisture damage mold on the roof sheathing. It should not be used for double duty for a bath fan exhaust.

The bathroom exhaust pipe would be pushed up to the screen i wouldn t be cutting the existing vent secured by a box with a 4 in hole cut in it to hold the pipe exactly that will be attached to one of the supports holding the existing gable vent. Bathroom fan vent size pipe material exhaust bath fan through attic and roof install roof vent for bathroom fan if you cannot walk across the image of bathroom and closet 20000 reviews of the best bathroom and closet pictures. However it is possible to use the existing roof vent often the duct is secured to one side of the roof vent so that it can still be used for attic ventilation. Duct already wrapped in insulation at home centers.

First you ll partially block your roof vent with the piping reducing the flow of cooling air through your attic.