How To Vent A Bath Fan Through A Metal Roof

The master bathroom and the 2nd bathroom vent through the roof and through the same opening.

How to vent a bath fan through a metal roof.

Installing some type of ventilation mechanism on a metal roof is not a lot different from the addition of vents to any type of roof. The bathroom exhaust ventilation fan disperses air through an opening in the fan housing which is usually 3 inches in diameter and ideally faces in the direction of the ventilation system outlet. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. Take the end of the duct with the connector fitting and attach it to bath vent fan.

However there are a few simple tips that will help make the process a little easier and also ensure that the vents are placed to allow the maximum benefit. I recommend that my clients vent their bath fans out a gable wall if at all possible when not using an hrv or erv that is. The 2nd bathroom vent drips on the floor and is ruining the ceiling. Pass the opposite end of the duct through the hole in roof.

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. Run a thick bead of tri polymer sealant along the underside of vent hood. Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot. Next use aviation snips to cut slits into the sheet metal sleeve.

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 3 or 4 inch duct connects to the outlet on the fan housing and runs to a side wall or to the roof and connects to a vent cap that allows the. Bend over the tabs then nail the tabs to the roof.