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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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Bathroom exhaust fan through clay tile roof

I've installed an exhaust fan in an upstairs bathroom and need to vent it through the clay tile roof. (pic attached) The standard 4" pipe jacks and flashings I'm finding at Home Depot don't seem to ...
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2k views

Using PVC pipe for bathroom exhaust fan duct

I have to run a length of about 3 meters of duct (from the fan to the outside), where there will be 2 90° bends. I was going to use plastic flexduct, but I can make the bends bends and some of length ...
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57 views

Can mold growth be removed and cleaned up in a two-story apartment building successfully?

I live in an apartment building that has 24 units which all the bathrooms vent into the hollow walls or their neighbors bathrooms upstairs. (so in their ceiling, the smell and moisture comes out ...
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1answer
9k views

How to improve light quality from a bathroom exhaust fan?

I have an interior bathroom with no windows. In the ceiling is a NuTone 763RLN exhaust fan with light bulb fixture. This unit was built in 2003, so the only light bulb specification provided is "100 ...
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0answers
210 views

Can a horizontally-vented kitchen exhaust have a downward-facing outlet in a soffit?

Can I vent a kitchen exhaust fan horizontally to an exterior soffit, ending with a downward outlet/cap? (Or must the outlet be horizontal (through a wall) or upwards (through a roof)?
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How can I tell if my bathroom ceiling vent is working properly?

Seems to take the vent forever to clear shower vapor from room. I purchased a vent that had a good rating. It is vented to the outside. How do I know if it is working properly and actually venting to ...
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3k views

How do I wire a bathroom exhaust fan/light to two switches?

I could use a diagram to wire the following: a bathroom exhaust fan with light on two separate switches. I also need a 3rd switch for a vanity light and a GFCI. My power comes from the attic (12/2 ...
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1answer
1k views

What power and type of in-line bathroom extractor fans should I be looking for?

We had some mould appear in our bathroom and I suspected that our inline extractor fan was underpowered. As it happens the extractor just stopped working, so I'm in the market for a replacement. I ...
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Is it possible to retrofit an external kitchen fan in an existing house?

I have a 2-storey half duplex that was built in 2008. The kitchen (1st floor) has a range hood fan that exhausts to the side of the house through 8" aluminum duct. The outside vent is not directly ...
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1answer
45 views

In-line fan installation

Can an In-line bathroom fan be installed horizontally or just vertically ? Been searching all over but no manufacturer specify that on their guide. Thank you
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4answers
487 views

Combatting moisture in crawl space after venting window is sprayed with insulation?

I had a crawl space (top left) in my house which had a 12"x6" venting window. There is a room above the crawl space, so I decided to spray the walls of the space with closed-cell foam insulation which ...
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1answer
8k views

Fast trick to figure out to where bathroom fan vents out

Recently had a guy come out to clean the clothes dryer and clothes dryer vent. Asked him to clean out the bathroom fan vent as well. He looked up the attic, on the roof, and along the siding, and ...
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4answers
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Should I switch to a vertical exhaust fan to avoid 90 degree bends?

I am replacing the original kitchen exhaust fan on my 1950s house. The old one vented sideways to an immediate 90-degree bend (to 8-inch rigid ducting) and then straight up about 24~36 inches to the ...
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2answers
78 views

Is 4“ Ducting Used for a 4” Bath Fan?

I'm interested in installing a bath fan and am currently planning ou the project. The fan specs (https://www.homedepot.com/p/Delta-Breez-GreenBuilder-Series-100-CFM-Wall-or-Ceiling-Bathroom-Exhaust-...
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2answers
81 views

Could someone explain these wiring diagram symbols please?

This is for a bathroom ceiling fan. I recognise the pull cord switch. It's the two middle symbols I'm not sure about. The square one on the right. Is that just a switch? Something like this: https://...
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5answers
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How can I connect a timer to my bathroom exhaust fan?

I have a bathroom fan, but it only runs when the light is on (i.e. no delay). The fan itself is really good, but it should really run on after (I think this might be part of the Building Regulations ...
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5answers
13k views

How can I wire an exhaust fan to turn on from multiple locations?

I just bought a Panasonic FV-20NLF1 inline bath exhaust fan that I planned to used to exhaust 2 different bathrooms. I want each bathroom light switch to control the fan, so when the lighting turns ...
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1answer
85 views

Exhaust Fan Runs With No Power at All!

How can my furnace exhaust fan run with the power off, the thermostat off, and the breaker off?!
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2answers
386 views

filtered air intake for whole house fan

I'm installing a new whole-house-fan, and am expecting good results. We live at 8,000' and have ~40 degree (f) temperature swings between day and night with very little humidity. But we also have ...
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2answers
699 views

Can I ground my new exhaust fan to the metal box where there is no grounded conductor?

Can I add a green ground screen to my exhaust fan's housing (metal) and connect the green ground wire to it? There is no ground wire in the old supply wiring.
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3answers
264 views

Why is my bath exhaust fan noisy only when installed in the ceiling box?

The house and fan are 45 years old. The fan in the guest bathroom sounded like a jet plane since we bought the house, but we finally decided enough was enough after some house guests complained. (Note:...
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7k views

bathroom fan does not turn on, just hums for 2 minutes then finally starts up

Lately every once in a while, when I turn on my bathroom fan, it does not start up. Rather there is this low humming sound for about 2 minutes. Then finally, the fan starts to run. Why does this ...
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1answer
42 views

How should I apply spray foam around a ceiling mounted bathroom exhaust vent?

I have a ceiling mounted exhaust fan that has a substantial (2-4" air gap along the sides after it was installed such that when it is running a lot of the air just gets pushed back around the sides of ...
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2answers
63 views

How to install an extraction fan in a ceiling which has an existing hole larger than required

I have an existing issue with my bathroom ceiling fan, as detailed in this post: How to fix an ineffective Extraction Fan setup in bathroom I now wish to change it to a Fan that: a) Has a new motor,...
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1answer
88 views

Clothes dryer causing humidity problems in garage - would extraction fan help?

We have a double garage with a high ceiling which is also where our laundry is. We have a problem with humidity in there due to the clothes dryer being in there which is used very regularly. This is ...
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1answer
509 views

Restrictions on 90 Degree Elbow for a Bathroom Exhaust Fan?

The manual for a certain (100CFM/4") bathroom exhaust fan has a restriction on using 90-degree elbows close to the unit. Why is this? Is it okay to use 90-degree elbows further down the exhaust path? ...
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1answer
2k views

Bathroom exhaust fan wiring issue, power to light then switch?

I am installing a new exhaust fan into my bathroom. I plan to use a 2 function rocker switch to operate the fan and light independently. The power passes through the light first, and then to the ...
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1answer
65 views

How can I remove exhaust pipe cover that's sealed with silicone?

I want to remove and replace the exhaust pipe cover shown in the picture below, but I can't get it off. The wall is made up of (in the order from outer most material to the inner most material: ...
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2answers
2k views

How can I vent a bath fan with no access to exterior?

We are redoing our bathroom and just discovered when we were replacing the fan that is wasn't vented out anywhere. How can we vent now? It's between floors with no windows and a brick wall. The only ...
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1answer
98 views

Extending a hard-to-access exhaust fan duct

Just pulled out an old bathroom fan. It was screwed to a 12-inch-long piece of non-flexible duct (so it came out with the fan casing). The end of the duct is buried in the insulation up in the attic. ...
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2answers
4k views

Is a 20A switch needed for a bathroom fan/heat/light combo unit?

I have a dedicated 20A circuit going to my bathroom that I plan to use to hook up a fan/heater/light/night light combo unit. I would like to use the compact combo 2 or 3 decora rocker switches. A ...
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1answer
41 views

Cold bathroom that has exhaust

So I have started to notice the bathroom with an exhaust is starting to get really cold as the temperature is getting colder. Is there something I can do about this? Should it really be that much ...
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1answer
4k views

Adding exhaust fan to existing single light switch

I have added an exhaust fan in bathroom to an existing single light switch that operates one light. I'd like the switch to turn the light and the fan on together. The existing switch has one feed of ...
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1answer
4k views

Maximum length for bathroom extractor/exhaust fan vent

Our bathroom extractor fans are vented into the attic of our ~70yr old house in Philadelphia. According to our home energy auditor this is pretty common here. We want to vent these to the outside ...
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1answer
150 views

Should there be an air outlet in an attic with a whole house fan?

There has been a whole house fan between the second floor and attic of my house for some time. We usually have it on with the downstairs windows open. I just had a thought: Should there be an open ...
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1answer
2k views

How do I extend a length of aluminum flex vent hose?

I'm replacing a bathroom ceiling fan, and need to add a short extension (approximately 18") to the length of the existing vent hose. The existing hose is 4" aluminum flex. I have a couple questions. ...
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1answer
33 views

How to replace bathroom fan?

For about two years now, two of my bathroom fans have not worked and I haven't gotten around to changing them. But I am wondering the best way to replace it. The current fan/light I have installed is ...
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2answers
48 views

Vibrating attic fan

I recently replaced the motor in my PR3 Master Flow attic fan. The fan with the the new motor vibrates significantly more than the old one. I may have been a little too aggressive trying to get the ...
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3answers
124 views

How do I balance an attic fan?

I have recently replaced a motor for my attic fan because the original one burned out. I did measurements for the height of the fan blades in relation to the supports and ensured that when I re-...
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2answers
1k views

Exhaust Fan tripping GFCI

Our shower exhaust fan is tripping the GFCI when turned on. When I disconnect the FAN (there is a molex plug in the fan) the GFCI does not trip when the switch is turned on or off. Looking for ...
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1answer
42 views

Is this an appropriate replacement for our current bathroom extractor fan?

Our existing fan is old, inefficient and extremely loud. I believe it is an old P Series centrifugal extractor made by Greenwood Airvac, although I am unable to be certain as the model and serial ...
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1answer
644 views

Installing a Bath Fan Without Attic Access?

I'm looking to install a bath fan (https://www.homedepot.com/p/Delta-Breez-GreenBuilder-Series-100-CFM-Wall-or-Ceiling-Bathroom-Exhaust-Fan-ENERGY-STAR-GBR100/204347760) in a bathroom on the second ...
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1answer
219 views

Installing a Bath Fan Roof Vent Without Attic Access?

I'm interested in installing a bathroom extractor fan where there was a previously small regular fan, but there isn't an attic above the bathroom. The switch is already wired from the previous fan ...
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2answers
152 views

Where do you put the oil when oiling a fan?

I know some fan motors have ports to oil but many do not (bathroom exhaust fan, bathroom heater fan, regular house fan, etc). How do you oil the ones that do not have ports? Specifically, where do ...
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1answer
864 views

Bathroom exhaust leaking when it rains

I have a water leak in my bathroom from around the exhaust housing that fits up into the ceiling. It only happens when it rains . How do I fix this problem?
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1answer
420 views

Garage gable fan proper installation

I want to add a gable fan in my garage to help cool it and help to let out the humidity in the winter. My garage doesn't have a high peak, so there is about 24" of height at the peak on the gable and ...
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2answers
2k views

There is a red wire in my ceiling junction box. What does it do? Where would I hook the ground wiring from the fan?

I am installing a vent fan in my basement bathroom. I am ready to wire it in, but I do not know what this red wire is for: https://imgur.com/a/uSnRLuv I also am not sure what the green ground wire ...
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1answer
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installing bathroom exhaust fan in drop ceiling

What is the best way to install a bathroom exhaust fan in a short, dropped ceiling? From what I can tell without having removed anything, the tiles look to be at most 3 inches below the actual ceiling ...
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2answers
140 views

Clearance for bathroom vent fan

I am looking to add some storage space to my bathrooms by installing some wall-mounted, pre-built upper cabinets. The bathroom is arranged such that the only reasonable location for a cabinet would ...
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2answers
916 views

Bathroom exhaust fan/light combo only fan works

I bought a new bathroom exhaust fan and light combo. It came with two sets of wires, one for the fan and one for the light. It also came with an extra ground for the motor (where should I put that)? ...