Why must bath fans be exhausted to the outside?

Cheyenne McClure asked a question: Why must bath fans be exhausted to the outside?
Asked By: Cheyenne McClure
Date created: Tue, Jun 22, 2021 8:02 AM

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Those who are looking for an answer to the question «Why must bath fans be exhausted to the outside?» often ask the following questions:

❔ Why must bath fans be exhausted to the outside body?

38. Bathroom vent fans must be vented to the out of doors. Venting this fan into the attic is simply asking for problems. The excessive moisture will cause …

❔ Why must bath fans be exhausted to the outside of home?

Regardless of what kind of ventilation system you have for the rest of the house, exhaust fans are recommended in the bathrooms to provide local exhaust to remove excess moisture, cleaning chemical fumes, etc. The fan should be ducted to exhaust outside of the home, not into the attic.

❔ Do bathroom fans go outside?

  • IMO, and IME, bathroom fans should always be vented outside. Bathrooms are one of the biggest (if not the biggest) producer or water vapor in your home. When water vapor is trapped is can cause things like mold, mildew, damage to furniture, added difficulty in conditioning the air, and many more.

10 other answers

Bathroom vent fans must be vented to the out of doors. Venting this fan into the attic is simply asking for problems. The excessive moisture will cause condensation on the roof members, insulation and eventually cause mold. It is never OK to vent directly into an attic even if the attic itself is vented. So, the simple correct answer is NO.

Wood rot is an absolute certainty over time if you dump bath exhaust into an attic. This moist air must exhaust to the exterior of your home. This is non-negotiable.

Regardless of what kind of ventilation system you have for the rest of the house, exhaust fans are recommended in the bathrooms to provide local exhaust to remove excess moisture, cleaning chemical fumes, etc. The fan should be ducted to exhaust outside of the home, not into the attic.

"It was common in the '70s and '80s for it to be vented into the attic space," says Bayne. "Building codes today require that the exhaust is vented outside through insulated ducting to a roof vent that goes directly to the exterior." Otherwise, you may be contributing to moisture and mold problems in your attic or wall spaces.

Bath exhaust fans are about keeping your house in top shape by moving water out of your bathroom. Water is everywhere in a bathroom: splashing on the floor, beading up on the walls, dripping down the mirror. And there is one other invisible place where you will find water in the bathroom: in the air.

Newer fans are typically going to have either 4” or 6”ducting. This is important to know because if your fan is set up for 4” ductwork and you try and use the existing 3” duct work, the sound level will increase and the performance level will decrease. Bath fans must me exhausted to the outside, not the attic.

Experts say bathroom fans can become overheated when clogged by lint and dust, when left on too long or because of simple failure. The heat can ignite the lint, causing the fire. Run the fan for only short periods, and never leave it on overnight or while no one is home.

If you are not in a hot and humid climate like Florida, you should most definitely vent your bathroom exhaust fan to the exterior. Venting the fan to a soffit vent or to the ridge vent is not enough as air can easily be sucked back into the attic or the air could condense too quickly.

We insulate the bath vent ductwork to minimize the condensation that will otherwise occur as warm moist bathroom exhaust air passes through cool ductwork in the building attic or roof cavity. Our photo above shows a long routing of bath vent fan ducts across an attic floor to an exit at the building soffit or eaves and the condensation of moisture in such vent lines.

By Robert C. Young. A bath fan will remove moisture from the air and help prevent moisture-related problems, such as mildew, that could become big, expensive problems later. Installing a bath ...

Your Answer

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