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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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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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1answer
22 views

Replacing bathroom exhaust fan

Old fixture: combination fan and light New fixture: fan only New fixture wiring: 1 white, 1 black, 1 green Existing wiring: 1 white, 1 black, 1 bare copper, 1 red Wall switch: red & black ...
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60 views

Questionable electric work

My bathroom light is connected to the same switch that runs my exhaust fan. The switch doesn't go all the way up without an extra bit of a push and then sometimes when the switch is completely off ...
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1answer
20 views

Replace Broan 670 with new fan/light from bathroom

I have what I think is a Broan 670 exhaust fan installed in my bathroom. I would like a fan/light combo instead. I am unable to easily access it from the attic so I am hoping to replace it from the ...
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1answer
43 views

Light and fan switches

I would like to have a double wall switch for the toilet where one switch (#1) turns on both the light and the fan while the second switch (#2) turns only the fan. Please note the light and the fan ...
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1answer
54 views

Bathroom fan/light wiring help

I have old switches at home for the fan and lights. In short, 2 switches to control fan and lights separately. Recently, I've been trying to add a timer switch which requires neutral and it doesn't ...
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4answers
230 views

Why is my Panasonic Whisper series bath fan starting up so slowly?

I recently had a Panasonic Whisper Series bath fan installed in my bathroom by a plumbing/HVAC company and wired up by a separate electrician. The fan starts up extremely slowly: it sounds like ...
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2answers
217 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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3answers
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Can 14/3 wire, with all three conductors hot, be the only cable in a switch box?

I currently have a bathroom light and a single pole switch at the door. The power for the light first comes into the ceiling box directly above the light. The hot is tapped in right there by using the ...
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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
57 views

New bathroom fan has a 2 prong plug. Old fan was straight wired. How do I convert?

My new exhaust fan has a 2 prong plug, my old fan was straight wired so I don't have a receiver. How do I convert to straight wire?
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1answer
80 views

How to wire 3 separate switches to a single exhaust fan

I have installed multi port exhaust fan in the attic to serve 3 separate bathrooms. How can I wire the fan so that the fan can operate independently from a switch in any of the bathrooms?
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1answer
251 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 ...
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Exhaust fan outlet broken

Can anyone tell me if I can buy an outlet for my bathroom exhaust fan? It cracked and I want to replace. Thanks in advance
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257 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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15 views

Two Exhaust Vent on the ame circuit

Can I install two bathroom exhaust vents (adjacent bathrooms) on the same circuit but with each having their own switch?
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1answer
114 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
60 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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1answer
83 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 ...
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2answers
61 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
214 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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2answers
422 views

What Type of Ducting Should Be Used for a Bathroom Exhaust Fan?

I'm planning on installing a Bathroom exhaust fan (Just a note, the port is 4") and am curious as to what kind of duct should be used. I've heard that the duct should be insulated to prevent water ...
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2answers
209 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). ...
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1answer
306 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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2answers
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difficulty of replacing bathroom fan

I have a fan in one of the bathrooms of a 1930s house and there's a relatively low ceiling. The fan seems to work ok and it's in pretty decent shape(seems to be from 2013), but I think we need a bit ...
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2answers
80 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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1answer
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How do I wire in a bathroom light/fan to this box?

This is a very old house. I wanted to add a light/fan to this bathroom while the ceiling was down for repair. When I opened the switch box this is what I found (second picture). A GFI wired correctly,...
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Can I re-use the housing/wiring from a Nutone 669 bathroom exhaust fan (w light) when installing a Nutone 769?

I don't have easy access to the attic to remove the existing housing, but the dimensions are identical and the wiring is already done (two switches - one for fan, one for light). 769 fan specs are ...
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201 views

Can I put in a vented bathroom fan in my condo

I just purchased a condo in Myrtle Beach, SC - it is the first time I have owned a condo versus a house. While exploring, I found that the bathroom fans don't vent outside, they just circulate the air ...
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56 views

How do I calculate fan size for a single room exhaust system to reach a desired cfm when restricted to specific duct size/route?

I am wanting to exhaust a sealed room (except for air intake and exhaust). The room is 512 ft3, and due to positioning, orientation, and existing construction, I am restricted to using 6" flexible ...
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1answer
81 views

Downstairs exhaust fan venting into upstairs?

I recently purchased a bi-level home with two full baths. The inspection didn't include ductwork, but it seems to me that the downstairs bathroom is somehow venting into the rest of the house. There ...
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4answers
461 views

Mini Split Condenser in Garage? With ventilation?

I live in a fairly warm and dry environment and due to HOA restrictions am unable to place a window A/C unit, outdoor unit, or a system on the roof. I understand that A/C shouldn't go in attics due to ...
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3answers
358 views

Compensate inadequate exhaust vents for whole house fan by installing a power vent in attic?

I would like to install a whole house fan in my 2400 sf house. However, with only three 1 ft x 2 ft gable vents, I'm looking at an NFVA of only 3 sf of exhaust vent when taking into consideration that ...
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2answers
144 views

Help with bathroom timer and light switch install

I’m fairly new to doing my own electrical so be gentle if this is a simple question. I’m trying to install a fan button timer along with a new rocker switch for my bathroom. In the image below the ...
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1answer
194 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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3answers
883 views

How do I remove a blower wheel from a shaft that uses a slip ring?

Exhaust fan blower wheel is attached to the shaft of a 1/100 hp induction motor; I can see a ring thru’ the vanes; how to remove? How do I remove a blower wheel from a shaft that uses a slip ring?
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2answers
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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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49 views

How to convert bathroom ceiling exhaust fan to a ceiling fan

I'd like to remove a bathroom exhaust fan and in it's place install a small ceiling fan for better circulation. This bathroom does have a window that opens so I'm not concerned about code nor ...
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1answer
826 views

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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1answer
206 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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62 views

What's wrong with my replacement fan motor?

I have one of those integrated bathroom 3-in-1 ceiling units (light, heat and exhaust fan). Recently the fan spontaneously stopped working. I took the unit down to inspect the fan motor and took it ...
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1answer
73 views

Bathroom light and fan combo safety and wiriing

I am putting a new bathroom light and fan combo in my bathroom. I already have a light above the mirror of the bathroom that provides light for the rest of the area. However the fan/light combo I ...
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1answer
57 views

Wiring bathroom exhaust fan / light

I have a bathroom with 2 wall switches, 1 for vanity wall light and 1 for exhaust fan. I want to replace the exhaust fan with a combination light/exhaust fan. The switch that operates the old exhaust ...
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2answers
1k views

Bathroom Wiring - Existing light - Add Bath fan - Add gfci outlet

I have a single light fixture in my bathroom on onw switch. The room has no fan and no outlets. I want to add one fan, and add one gfci outlet. I have two ideas. Looking for pro / con / feasibility +...
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2answers
78 views

Can I attach a extract fan on a portable a/c unit exhaust hose?

I have a window a little far(+-5 meters) from the room i wish to add an portable a/c. Is it possible to use an extractor fan to help pull the exhausted air from the portable a/c?
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2answers
89 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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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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774 views

Bathroom exhaust/light combo - light doesn't come on until fan on

In our guest bathroom, we have a fan/exhaust combo with 2 switches. Today my wife noticed that the light wouldn't turn on until she turned the fan on. Then she could turn the fan off and the light ...
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316 views

Installing bathroom exhaust fan ( light , fan , and heater with three seprate switches on wall

Need help on wiring light unit. Have three plug-ins inside unit. One for light , one for fan , and one for heater. Have three cables coming into unit. All three cables are 2 wire with ground wire. ...
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3k views

Exhaust fan venting through soffit where attic has no vent

I am installing a bathroom exhaust fan in a portion of the house which is a small addition to the original house. The attic above the addition is separated from the rest of the attic by the original ...