Why must bath fans be exhausted to the outside of room?

Orlo Davis asked a question: Why must bath fans be exhausted to the outside of room?
Asked By: Orlo Davis
Date created: Sun, Jun 20, 2021 9:01 AM

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Those who are looking for an answer to the question «Why must bath fans be exhausted to the outside of room?» 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 bring air outside the room?

Bathroom vent fans are rated for the amount of air they can move, measured in cubic feet per minute, or CFM. Standard fan sizing applies to bathrooms that are 100 square feet or less. The rule of thumb is that you need at least 1 CFM per square foot of room area.

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.

Description. Description. 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.

Bathroom code does address the issue of moving odor- and moisture-laden air from the bathroom to the outside. Surprisingly, bathroom fans are not required by some building codes. All municipalities have different requirements, but some do not draw a hard line on requiring exhaust fans.

Exhaust air from bathrooms and toilet rooms shall not be recirculated within a residence or to another dwelling unit and shall be exhausted directly to the outdoors.”. Just remember the goal of a bathroom fan is to exhaust obnoxious gasses & moisture resulting in a healthier, safer living environment.

Bath fans help remove odors and moisture — and can be used in some homes to satisfy whole-house ventilation requirements. By Martin Holladay| August 7, 2014. Manufacturers offer a wide range of bathroom exhaust fans,from simple models with few bells and whistles to energy-efficient models with sophisticated controls.

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.

The reason for placing the bathroom vent motor in the attic and running an exhaust duct behind the toilet was that some jurisdictions do not allow to have the bathroom vent assembly installed lower than any sink, tub, toilet edge or shower head.

Answer (1 of 5): Depends on your definition of cool down. If you looking at cooling the room by say around 10 deg C, I must say it won’t work. Exhaust fan can only bring fresh air into the room. The room can be made a bit cooler (around 3 to 5 deg C) if the outside air is cooler than the room’s a...

Wall mount fans that exhaust directly are also the most prone to backdrafting, and they are less effective at evacuating the warm, moist air that will rise to the ceiling. I always use ceiling fans (super quiet and efficient Panasonic) with rigid aluminum ducting with foil-taped joints, sloped ¼" per foot to the outside for drainage.

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