Asked by: Daud Labbe
home and garden home appliances

Do you have to vent bathroom fan outside?

Last Updated: 19th June, 2020

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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.

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Considering this, do exhaust fans need to be ducted?

To put it simply, if you have a colourbond, flat or narrow pitched roof or sarking (silver paper insulation) in your ceiling space then you will need to have a 'ducted' exhaust unit installed. The recommended air flow rate of exhaust fans state they should be between 50 – 100L/s.

Similarly, how far can you run a bathroom fan vent? Minimum vent fan duct lengths Fantech recommends a minimum of eight feet of insulated flex duct between the exhaust inlet register or grille and the fan motor. The company does not cite a maximum exhaust duct length.

Similarly one may ask, how much does it cost to vent a bathroom fan outside?

Cost to Install Bathroom Exhaust Fan Through Roof A bathroom exhaust fan costs between $15 and $300. With labor, expect to pay $60 on the low end and $500 on the high end. This cost depends on the fan price and the project difficulty. You can also redirect air and moisture outside with a roof vent.

Can you use PVC pipe to vent a bathroom fan?

To prevent condensation from happening, it's best to insulate the outside of the pipe. I'd give serious consideration to using foam core PVC pipe as the vent pipe for your fan. The fittings can be glued and any water that might form in the pipe will never leak onto your ceiling or down a wall.

Related Question Answers

Prudenci Glavatsky

Professional

Can you use dryer vent duct for bathroom fan?

Smooth metal duct also maximizes vent fan airflow performance. But flex duct and insulated flex duct are approved by bath vent fan manufacturers are very widely used for fan venting because of its ease of installation and low cost, as we describe next.

Terje Garriz

Explainer

How do I vent a bathroom fan into the wall?

Appropriate venting runs up into your attic, then along or through floor joists until it reaches the eaves. From there, it can be exhausted out a soffit. In some instances it may be more practical (and less expensive) to run the vent directly out a wall, or through a vent stack in your roof.

Holanda Bernales

Pundit

Is it OK to vent bathroom fan into soffit?

A: It is never a good idea to discharge a bathroom or kitchen fan through a soffit, gable or ridge vent, or the roof itself. The most efficient way to vent bathrooms is to do so downward through a basement or crawl space and outside through the rim joists.

Jerrod Pacio

Pundit

Do kitchen exhaust fans have to be vented outside?

It's far preferable to vent the air outdoors than to recirculate it into the room. A vented hood that removes steam, smoke, heat, and cooking odors is the best way to keep your kitchen clean, since it gets rid of grease particles that would otherwise accumulate on your walls and cabinets.

Haide Lafferentz

Pundit

Where is the best place to put an exhaust fan in a bathroom?

Typically a bathroom exhaust fan should be mounted as close to or inside (if rated for tub shower use) to the shower or tub as possible. This will maximize the effectiveness of the unit. Units located in a powder room, should be directly over the toilet.

Alpha Gochi

Pundit

Who can install bathroom exhaust fan?

If you hire an electrician, you may also need to hire someone –- a handyman, perhaps -- to patch drywall or do other finishing work. Installing a bathroom exhaust fan usually takes three to four hours, and costs between $165 and $350.

Justas Cortezon

Pundit

Do bathroom exhaust fans really work?

If the fan holds up the toilet paper, then the fan is working properly. Keeping the bathroom door open while running the fan will allow for air exchange from other parts of the home. We recommend using bathroom exhaust fans for 15 minutes after using the shower to help move humid air out of the living space.

Ekai Hilgefort

Teacher

What does bathroom exhaust fan do?

A bathroom vent fan is a mechanical ventilation device that exhausts indoor air to the outdoors via a flexible tube or metal duct. A vent fan will draw out moisture and odors from the bathroom, improving air quality.

Nam Genco

Teacher

Can you tie two exhaust fan vents together?

Each bathroom has its own exhaust fan; each fan vents separately out the roof. If you have two bathrooms that are close together and one has an exhaust fan and the other doesn't, you might be wondering if you can tie a new exhaust duct into the existing one. Well, you can't!

Stefani Jukhnin

Teacher

How much does it cost to install an exhaust fan?

Type of Fan
This is the first determining factor of installation cost. A standard exhaust fan costs around $70 to $120. A combination fan and heater costs $110 to $210. Installing a simple fan that gets the job done adequately will lead to no extra costs.

Ahinoam Wernner

Teacher

Are bathroom exhaust fans Universal?

Wall fans are mounted to the exterior wall of your bathroom and pull the warm, steamy air out of your bathroom and exhaust it directly outside your home. Universal Fans: Universal fans are versatile bathroom fans that can be installed either in the wall or the ceiling.

Valdecir Valderas

Reviewer

Can I install a bathroom fan myself?

Bathroom exhaust fans remove moisture, heat and odors from the bathroom. Each will need its own exhaust fan. Whether you need to install a new wall bathroom exhaust fan or a ceiling bathroom exhaust fan, bathroom fan installation is a project you can do yourself.

Aythamy Peteiro

Reviewer

How much do bathroom fans cost to run?

At the midpoint, 70 watts, if a kilowatt costs 10 cents per hour, the fan would cost 0.7 cents per hour (0.07 kwh x 10 cents).

Eliseu Noeme

Reviewer

Is it easy to replace a bathroom fan?

The installation is easiest if you're replacing an existing fan. You can use the existing switch, wires and ductwork. Also, it helps to get a fan that's the same size as your existing fan so you won't have to adjust the size of the ceiling hole. The size of your bathroom can help determine how many CFMs you need.

Yelyzaveta Song

Reviewer

What is code for venting a bathroom fan?

Bathroom Exhaust Fan Venting Code Summary
Summarized, if you install a window in the bathroom, it must be at least 3 square feet in area.

Arabel Kaltenthaler

Supporter

Can you vent a bathroom fan into plumbing vent?

First is that you have a serious risk of venting sewer gasses into your home. This is why drain vents open above the roof line or use one-way air admittance valves. This is likely to be unpleasant and possibly unhealthy. Second is that a drain vent is typically too small and too moist to properly vent a bathroom fan.

Ismael Blundell

Supporter

Are all bathroom exhaust fans the same size?

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 minimum allowed fan size is 50 CFM, so if your bathroom is, for example, only 42 square feet, you still need a 50 CFM fan.