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Questions tagged [exhaust-fan]

For questions about exhaust fans -- i.e. fans used to remove air from specific rooms in a building and exhaust it to the outside in order to control humidity and/or combustion products. Exhaust fans, unlike [ceiling-fan]s, are installed into the building's structure, either in a fitting within the room's ceiling, or remotely, drawing air from the room via a duct and grille.

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24
votes
4answers
220k views

Does a bathroom exhaust fan have to vent to the outside?

Is it normal and/or code compliant to have a bathroom exhaust fan venting to the attic? I've seen this a couple times now, and the first time I saw this I thought it was very odd. But I mentioned ...
17
votes
5answers
9k views

Exhaust fumes seeping into our 4th floor apartment at night through bathroom and shower vents/fans

This is our second fall/winter in our 4th floor apartment, and we've noticed that whenever the weather becomes cool, exhaust fumes which seem to come from the garage in the basement of the apartment ...
12
votes
6answers
93k views

What is the purpose of a bathroom exhaust fan?

Okay I actually do understand the purpose of the bathroom fan; it gets the steam out of the bathroom after a super hot shower, right? Well turns out I never turn it on. I suppose I don't shower in ...
9
votes
3answers
38k views

Can I vent my bathroom exhaust fan into a plumbing drain vent?

I installed a bathroom fan in the ceiling. My bathroom is in the room right next to the laundry room. The washing machine has the standard drain pipe vent of a pvc pipe venting to the outside ...
9
votes
2answers
21k views

What are the pros and cons of soffit vents vs. roof vents?

During my latest foray into the attic, I discovered that my bathroom exhaust fans vent directly into the attic. I'm worried about moisture buildup and I'm considering routing the exhaust to an ...
9
votes
3answers
33k views

Why is water leaking near my bathroom's exhaust fan?

This weekend when the snow started melting on my roof, I noticed a small water spot developing around all three bathroom exhaust fans in my house. I'm guessing the water leaked in around the exhaust ...
8
votes
3answers
2k views

Should a bathroom fan vent to a separate duct system?

Is it acceptable to route a bathroom exhaust fan to the return of a central air system? I'm afraid this will cause mold to grow in the air return ducts. There is currently a fan in our bathroom and ...
8
votes
2answers
28k views

How can I seal the gap around a bathroom exhaust fan?

I've got my exhaust fan installed in the ceiling of the bathroom, now I'm wonder how best to seal the gap around it. The fan housing is obviously sheet metal, and the ceiling has the plastic vapor ...
7
votes
4answers
43k views

Is it possible to vent two exhaust fans through a single wall penetration?

I have two bathroom exhaust fans that need to be vented out of the house, but I'd like to do it using a single wall penetration. Is there a code compliant, safe way to do this? Both bathrooms are on ...
6
votes
2answers
1k views

What kind of vent is pictured here and what are its uses?

While my roof was being replaced, I requested that they install two roof vents. One for laundry and one for bathroom fan. They installed two of these. I just tried connecting the bathroom fan to this ...
6
votes
1answer
17k views

Is it better to vent a bathroom fan out the soffit, the side of the house, or the roof?

Working on a friend's house, we're installing a bathroom fan. He had planned to vent the fan out the closest soffit, which is only a few feet away. I'm trying to persuade him to vent it out the roof ...
6
votes
3answers
3k views

What's the right connector for connecting #12 solid copper to #14 stranded?

Still working on installing my exhaust fan. It required a dedicated 20A circuit so I ran #12 copper. The wiring from the unit appears to be #14 stranded. It's also silver colored but I don't know if ...
5
votes
3answers
51k views

How can I rewire my bathroom fan, light, and receptacle?

My bathroom has one switch that powers the fan and light. In that electrical box, there is also a hard wired electrical outlet that sits in the bathroom. Since I don't have room for a 2 gang box in ...
5
votes
1answer
794 views

Can I place ventilation ducting on top of joists if there is space?

I'm installing a ceiling-mounted extractor fan above a kitchen island. The problem is with the placement of ventilation ducting in the ceiling: the joists are running in the opposite direction to the ...
5
votes
3answers
8k views

Is GFCI protection required for a dedicated exhaust fan circuit?

I'm considering installing an exhaust fan in my bathroom which includes light and heat, and requires a dedicated 20 amp circuit. Would this circuit need GFCI protection? The instructions for the unit ...
5
votes
6answers
15k views

How should I vent bathroom exhaust fans in an old brick house with slate roof?

I recently moved into an old brick house (slate roof), containing several bathrooms without vents. It's a problem that I've been wanting to correct, though I've put it off because I'm not sure if ...
5
votes
1answer
1k views

Is there aluminum wiring in my vent fan?

I just purchased and installed a new Panasonic FV-10NLF1 inline exhaust fan. My house has copper wiring, but the wires on the fan appear to be aluminum (they are silver in color). I didn't think ...
5
votes
6answers
8k views

Air sealing a whole house fan

I have a whole house fan installed in my house from the previous owners. I love the fan, as it lets me cool down the house quickly in the evening -- or after I fill the house with smoke from ...
5
votes
1answer
1k views

Why won't my new exhaust fan wired between switch and light fixture work?

DIY electrical guy here. I have one 2/12 coming into the top of an existing wall switch (sgl. pole) that powers an existing light fixture. So I assume (right or wrong) that the current is coming into ...
5
votes
3answers
12k views

Installing bathroom exhaust fan: what to do with vapour barrier and insulation?

I'm adding a bathroom exhaust fan, which is being mounted in the ceiling of the bathroom (in the attic) and venting out through a vent in the wall. right now, there is a vapour barrier (paper) ...
5
votes
2answers
2k views

Is it OK to vent a first floor bathroom with a fan and a duct running through the basement?

I have a bathroom on the first floor of a two-floor house where the popcorn ceiling has dilated and cracked open twice within a year, and some mold is always coming back next to the ceiling, so I need ...
4
votes
1answer
2k views

Why are my bathroom light and fan wired to the same switch? [closed]

In my apartment my bathroom light and fan comes on at the same time. Is that standard for an apartment?
4
votes
1answer
641 views

Can we build some sort of ventilation system in our rental apartment?

There isn't an exhaust fan in our kitchen. Everytime we fry or bake something we set off the smoke detector. There's a window pretty close to our kitchen. Is there a way to rig up some sort of ...
4
votes
1answer
429 views

Bathroom fan and clothes dryer share an exhaust duct

My dryer which is located in our garage and our downstairs bathroom vents are connected. When the dryer is running warm air is moving to the outside, but also some of the air is coming back into the ...
4
votes
3answers
5k views

Can I vent a bathroom fan through the eaves?

I want to fit a fan in our bathroom. The easiest way to do this seems to be to drill down from the loft and put it in directly above the shower. I'm then considering running the vent (flex pipe) ...
4
votes
1answer
1k views

Connecting a bathroom fan/light combo?

I'm replacing my old bathroom fan with a new fan/light combo. The new fan/light has four(4) wires, but the existing switch has only three(3) wires. How do I wire this set-up? There are white, blue, ...
4
votes
3answers
2k views

Fire hazard of exhaust fan with heating bulbs in bathroom?

Our strata gave us permission to install an exhaust fan with 4x 250W heating bulbs into our bathroom. We are on the top floor and the roof cavity above us is the ceiling for the building. There are no ...
4
votes
1answer
13k views

How do I install a 1st floor bathroom fan?

My bathroom is on the first floor with a finished bedroom directly above and an unfinished basement directly below. It would appear to be easier to install a wall or floor fan and direct exhaust down ...
4
votes
1answer
5k views

How do I lower the humidity in my non-vented laundry room?

I've lived in my house for about a year now and I have this small room (maybe 5x6) that contains my washer and dryer. I have central air and this room does not have a vent. Also this room does not ...
4
votes
1answer
338 views

Ice In Radon Mitigation System

I have a fan powered radon mitigation system installed in my house. It was installed in 2016 and I have not had any issues with it until this winter. I live in northern Iowa where we have been ...
4
votes
1answer
241 views

What is the best way to build a box to elevate my bathroom fan above joists?

I want to create a register/ return air type box about 4" high so my bathroom fan's exhaust will be above the joists so that the duct can have the shortest and most direct run to a gable vent. Is ...
3
votes
3answers
18k views

Will an exhaust fan made for ceilings work in a wall instead?

Does anyone know whether a bathroom exhaust fan designed to be installed in a ceiling would have any problems if installed in a wall instead? From a mechanical, ball bearings, noise perspective. Not a ...
3
votes
2answers
23k views

How can I quiet a bathroom exhaust fan that became loud only after the duct was added?

I had a fan added in my bathroom. Surprisingly there wasn't one at all. When the fan was first installed they had it venting into the ceiling. It was a .5 sone fan and you could hardly tell that it ...
3
votes
2answers
22k views

How do I remove this old bathroom exhaust fan?

My ancient 1960s bathroom fan (a NuTone 8832) stopped working. I removed the cover and fan, but the "metal box" assembly is still in the ceiling. I'm not sure how to get it out. Here's the unit, with ...
3
votes
2answers
23k views

What wiring do I need for a fan/light/night-light fixture?

I am replacing a bath fan/light with a fan/light/night light combination fixture. I need a new wall switch with 3 controls. I currently have just a cable with hot, neutral and ground running through ...
3
votes
1answer
2k views

How do I support vertical runs of round ducting?

Supporting ducts horizontally seems pretty straight forward--just a loop of strapping underneath to support it. What about when the duct runs vertically? Do you use the same kind of strapping but ...
3
votes
2answers
4k views

What options are available for ventilation above a stove?

We are taking out our cabinets above our stove area, to create an open plan to the dinette area on other side of counter. Can we have a ceiling mounted fan above stove? (flush with the ceiling) What ...
3
votes
4answers
129 views

Should my mirror fog up when showering with a proper exhaust fan running?

I run the exhaust fan when showering but even so, the mirror fogs up completely. Is this an indication that the fan is not sized or functioning correctly? Or is this expected behavior, as no exhaust ...
3
votes
2answers
358 views

Replacing Bath Fan Switch with Timer Switch

I want to install a timer switch (it has four wires, red (load), black (hot), white (common), green (ground) to replace one switch in a 2-gang switch box having five incoming cables (see first photo). ...
3
votes
2answers
15k views

Seperating bathroom light and exhaust fan on single switch

I have a single switch that turns on both the bathroom light and a separate exhaust fan at the same time. I want to change this to be able to power them on independently via a dual rocker switch or ...
3
votes
2answers
7k views

How to lubricate a buzzing fan?

I bought a little mini fridge (ok, it's actually one of those wine cooler thingies) that buzzes loudly. Took it apart and discovered the source of the problem: a little fan in there, similar to the ...
3
votes
1answer
3k views

Bathroom in-wall exhaust fan with dimmer?

In searching this SE, I see many questions discussing traditional ceiling fans and dimmer switches. This question revolves around bathroom in-wall exhaust fans and dimmer switches. Is it safe to ...
3
votes
1answer
3k views

How-to wire a Fan/Light in Bathroom with power at Switch box and Fan/Light box

I am helping a friend finish a small remodel to a MIL Apartment. Current subject: Bathroom I am trying to wire a new Fan/light to the separate switches at the wall. I want the (1) wall vanity light ...
3
votes
2answers
812 views

Should I vent 2nd floor bathroom exhaust down?

I am looking to install an exhaust fan in a bathroom where one does not already exist. I've read that it is preferable to run exhaust ducts down instead of up, but does that apply here? We would be ...
3
votes
2answers
6k views

Can I connect the exhaust vent from my range hood to the existing ceiling exhaust fan vent?

I recently bought a condo that I discovered after the fact to have a "Recirculating Range Hood" over my gas stove. My smoke alarm consistently sounds off when I cook. My HOA has denied multiple ...
3
votes
1answer
1k views

rewire ventilation fan to use pull chain instead of wall switch

I'm converting part of an unfinished space to make a darkroom. I'm installing a bathroom ventilation fan over the sink but there is no convenient place to install a switch for the fan. I purchased a ...
3
votes
1answer
131 views

How can I repair a bathroom fan under garage that is leaking in the winter?

I have a rigid metal exhaust pipe coming out of the bathroom fan over my downstairs bathroom. It goes up at approximately a 30 degree angle for about twenty feet and stops just before it gets to the ...
3
votes
1answer
1k views

Can I vent a bathroom fan through an attic window?

Would venting a bathroom exhaust fan into the attic and through the attic window cause any problems? I was thinking this would prevent cutting a hole in the roof or the soffit. My thought was to ...
3
votes
1answer
42k views

How can I stop exhaust fan vent condensation problems?

So, our bathroom fan leaks when it is cold. In the attic, the PVC pipe connected to the exhaust is uninsulated, and frosted -- shock! So, my question is, what is the best way to fix this? Do I cut ...
3
votes
1answer
532 views

Bathroom Vent is tied to ceiling vent in adjacent room

I live in a bungalow with a bathroom on both levels. The bathrooms both have exhaust vents. Outside of each bathroom is a ceiling vent. The previous owner stuck towels in these to block them off. ...