Install Bathroom Vent Into Attic

Each bathroom has its own exhaust fan.

Install bathroom vent into attic.

For optimum performance locate it between. In order to accomplish this the roof has to have a hole cut in it. A lot of options. These are easy to use and can be purchased at most home improvement stores.

In lieu a window 3 feet square or more capable of being opened at least halfway will suffice. Use a circuit tester to ensure that the power is turned off. Install bathroom electrical circuits. Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic.

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. Measure the vent fan. Drill a reference hole draw a mark on the bathroom ceiling where you d like to install the vent fan. The attic bathroom will need electricity to supply at least two 20 amp gfci outlets and one switch controlled ceiling light.

Bathroom exhaust fans are not required by most codes. 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. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. Remove your old exhaust fan.

No you cannot vent your bathroom exhaust fan into the attic. Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside. Bathroom exhaust fans perform an important function by removing excess moisture from your home. That will take it from the bath exhaust fan to a discharge point.

Each fan vents separately out the roof. Turn off the breaker box. One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms. You might have to remove a few screws to get it out.

Remove the grill cover. Now where the discharge point is is going to be up to you. Either way the vent will have to go directly to the outside and installed with a vent hood cover. Do not spill bath vent air into the building attic or roof cavity where it will condense on and damage building insulation roof sheathing possibly framing and where it will certainly encourage mold growth.

It is because of this that many builders tend to advise against this method. You should never exhaust the bathroom fan directly into the attic. See details at bathroom vent codes. Both bathrooms are vented by a single in line fan that has one exhaust vent running through the roof.