Run Bathroom Duct Through Roof Or Underhang

This article describes the recommended slope direction on bath exhaust fan ducts to avoid icing and related building leaks.

Run bathroom duct through roof or underhang.

Bathroom exhaust venting does not have to exit up through the roof and in fact that s not necessarily even the best termination. Hot air likes to rise venting through the roof is the shortest path so it has the least possibility of condensation and shorter runs are more efficient. One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms. Each fan vents separately out the roof.

In order to accomplish this the roof has to have a hole cut in it. Try to keep it close to the fan location. Start in the attic and drill a hole through the roof in the desired vent location. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof.

This is typically the case for ducts that run through a dropped ceiling or soffit or between joists so long as the floor system sits on top of a conditioned basement or crawlspace. The point of a bathroom exhaust vent or any vent really is to remove hot moist air from the house. Fantec makes some nice remote fan systems virtually silent in operation and you only need one fan for the 2 or more bathrooms. 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.

Whether it s new construction or a remodel a bathroom vent should always vent through the roof instead of an eave overhang or soffit. From up on the roof use a jigsaw or reciprocating saw to cut a 4 in. Each bathroom has its own exhaust fan. And while both a roof vent and an overhang vent perform this task there is one big difference.

Bath vent fan slope. Leave the drill bit sticking through the roof so you can find the hole. This article series explains how to install bathroom exhaust fans or vents the vent ducting the vent termination at the wall soffit or roof vent fan wiring bath vent duct insulation bath vent lengths clearances routing and we answer just. An exhaust vent fan can exhaust out through a gable end side wall or out through a soffit overhang.

The master bathroom and the 2nd bathroom vent through the roof and through the same opening. The 2nd bathroom vent drips on the floor and is ruining the ceiling. It is because of this that many builders tend to advise against this method. And of course a bathroom with a window doesn t require an exhaust vent.

This involves running ductwork from the fan usually though an attic and out through the roof. Both bathrooms are vented by a single in line fan that has one exhaust vent running through the roof.