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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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2answers
111 views

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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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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1answer
47 views

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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35 views

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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0answers
292 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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0answers
62 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
167 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
911 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
658 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
447 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
422 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
1k 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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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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0answers
105 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
1k 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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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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1answer
74 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
86 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
77 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
2k 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
271 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
141 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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0answers
887 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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1answer
370 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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1answer
4k 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 ...
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3answers
656 views

How to deal with the trapped air in a loft attic?

I live in an apartment (not a house) with a loft attic. It has enough space and I use it as a study room. In summer, the air is extremely hot as I walk up the steps to the attic. Initially I was ...
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0answers
229 views

How to insulate whole house fan opening for the winter (from the inside)?

There is a 3'x3' opening in the ceiling of my second (top) floor. The opening leads into the unheated attic. I want to both seal and insulate this opening to keep out the cold in the winter. (I live ...
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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)? ...
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3answers
142 views

Living near a highway in SoCal with no standard windows - how to install A/C?

I have an air purifier and keeping all windows/doors closed is going to be a must. But the humidity and temperature are issues now. I can get a dehumidifier but then I'm left with the temperature ...
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1answer
882 views

Bathroom exhaust vent into crawlspace

It is acceptable to vent a bathroom exhaust fan into a crawlspace? The crawlspace in question is uninsulated, has a dirt floor, and varies in height between 5' and 7'. The vent would enter roughly in ...
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1answer
30 views

Filtration system for smoke from oil lamp

I like to light a little oil lamp/ candle (lamp size about 2 inches in diameter) in my bedroom. Unfortunately the soot tends to make the wall and cupboards yellow. Is there a way to install a ...
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1answer
3k views

Possible source of dripping from bathroom exhaust fan?

During the winter, I experienced "Chinese water torture". The bathroom exhaust fan is located above the toilet. While seated on the throne, drops of water would hit my head every so many seconds. ...
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0answers
420 views

Increasing exhaust fan duct size

I have a bathroom exhaust fan that has a 3 inch duct outlet. However, I would like to use a 4 inch insulated flexible duct. Is there an adapter I can use to accomplish this or do I have to first use ...
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2answers
817 views

Should I increase the duct size of my bathroom fan outlet?

I have a new bathroom fan that I'm installing that is 70 CFM. It will only be in the water closet part of the bathroom as the bathroom already has a larger 150 CFM fan in it. The 70 CFM fan has a 3 ...
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1answer
82 views

What amps would I need for a variac fan controller?

I'm looking for a variac controller for a fan. I found one, but it's available in different models based on amps. How do I work out which controller would be the best one for my fan? My fan specs are:...
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3answers
244 views

How to cool a server closet with window?

I put 2 servers in my closet which run at about 90F. The closet has a window, but simply opening the window doesn't drop the temperature very much even when it is 60F outside. If I open the closet ...
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1answer
892 views

“Neutral wire required”!

I have a dual switch in my bathroom with two separate controls -- one for the fan and one for the light. It has the following four contacts: Ground (duh!) Two "common" ones, which seem short-...
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3answers
1k views

Kitchen Fan extraction not working as intended

After a long time suffering of sub-optimal fan extraction in my kitchen, I decided to go to the root of whatever was causing it. I have a Zanussi ZHC60136X. I clean the filter grids every now and ...
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3answers
7k views

Bathroom fan runs despite switch is off

My fan in the bathroom is constantly running no matter what position I put the switch to. The switch looks like this: And there is some other controller that I don't understand what it does (never ...
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1answer
1k views

How can I wire my bath fan to have automatic humidity control and manual switching?

I bought a bathroom vent fan with humidity sensor but no light. It unexpectedly arrived with 4 wires: ground, black, white, and blue. I only have 12-2 cable in the bathroom and no extra switch. This ...
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1answer
449 views

Belt and pulley fell off 40" attic fan & my repair failed (updated)

Summary (also see photos of fan and motor below) Update 2: I bought a capacitor for small dollars and now the fan works again, perfectly. Update 1: Capacitor was indeed broken (see photo at end) ...
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0answers
56 views

Is this large exhaust fan in bathroom installed right?

This window is right where the shower is. Can't have any fan but there. It opens upwards. Hired someone to install this fan but his idea was what you see in the picture. It's not sitting flush on the ...
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1answer
617 views

Convert bathroom exhaust fan/light combo to light only with 3 way switches

I have a Nutone exhaust fan/light fixture in my bathroom. The fan and light are each controlled by their own 2 pole switch, one is inside the bathroom and one is outside. I want to replace the ...
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1answer
17k views

Bathroom fan leaks during heavy rains

My bathroom fan leaks water during very heavy rains. It is on the first floor. The exhaust is also on the first floor on the side of the building, not the roof. The fan is on the ceiling and ...
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1answer
471 views

Disconnected Loud (IMO Useless) bathroom exhaust fan

Moved in to my apartment recently. The bathroom ceiling exhaust fan has been unbearably loud. I called my landlord maintenance and they only made it worse (they thought the problem was the light ...
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1answer
220 views

Bathroom fan sizing in 2 room bathroom with always open doors

I have a bathroom fan that died recently. It is a basic Broan from the 90's, 50CFM and 2.0 sones. I want a quieter fan for sure, but I'm not sure on the sizing. As shown in the picture, our ...
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1answer
4k views

How to connect a 3 wire plug to a 2 wire outlet?

Bought a vent fan that came with 3 wires, but homes here are only 2 wires (not sure which but no ground). What to do with the extra neutral wire? Should i cut it or twist it with the other two??
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1answer
100 views

BathroomExhaust fans run continously? [closed]

How much energy is wasted for the continuous operation of two bathroom exhaust fans? Why are the wired this way?
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1answer
933 views

How can I vent my kitchen exhaust through vinyl soffit?

My 1950s ranch had a loud, ineffective kitchen fan that I decided to fix up this weekend. Turns out that when a previous owner had vinyl siding added, they simply put the vinyl over the vent. I ...