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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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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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
56 views

How can I increase the effectiveness of my bathroom vent fan?

The vent fan in my bathroom isn't very effective. After taking a shower, the bathroom takes several hours to dry out. The fan itself works fine: it generates almost enough static suction to hold a ...
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4answers
69 views

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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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
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
48 views

Identify this bathroom extractor fan?

I have a bathroom extractor fan that has gone bad, so I need to replace it. If possible, I would like to just replace the motor, rather than opening up the ceiling to put in a whole new enclosure. The ...
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2answers
269 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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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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2answers
59 views

Any ideas how to replace bulb in this bathroom ceiling fan?

This is an old bathroom ceiling fan & light fixture. The bulb has gone out, now I cannot find away to open it and replace the bulb. There are no screws that I can see. I played around with glass ...
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2answers
54 views

How can I attach/seal around an exhaust fan duct at the roof?

I am redoing the ducting from a kitchen exhaust fan to the roof cap. The old ducting was 6" and I'm increasing it to 8" to match the vent on the new exhaust fan. The current roof penetration is a 6....
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2answers
103 views

Why does my bath fan turn off when light switch is on and vise versa?

I just put a new exhaust fan in the bathroom and connected it to existing light switch, which is connected to the bathroom light. When I turned the power back on, the bath light came on but not the ...
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1answer
369 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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0answers
60 views

25 feet vent ok for bathroom vent fan?

My old bathroom vent was just vented into the attic and I would like to run it to the side of my house and that is about 22-25 feet. My bathroom is 11'x6' with a 110 cfm fan. I live in Southeast PA. ...
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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 ...
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1answer
31 views

mounting fan/light in very tight enclosed space over shower

I am installing a combo shower fan/light over a walk-in shower; it is meant to be installed in the typical fashion (for recessed fixtures) of two adjustable-length brackets meant to span the gap ...
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1answer
38 views

Gravity grille not opening when bathroom fan is on

I have a question about airflow with a bathroom fan, in this case a Ventaxia VASF100T with a front cover, duct through the wall and a gravity grille on the outside. It seems quite inefficient at ...
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4answers
2k 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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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 ...
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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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1answer
38 views

How to retrofit existing kitchen exhaust fan

I'm remodeling a kitchen that is circa 1940's. In the kitchen is an exhaust fan that sits inside a 3.25x10 duct. I would like to keep an exhaust fan in this location and re-use the existing duct, ...
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2answers
53 views

Attic Fan in Garage of Ranch Home

My attached 2 car garage typically gets over 100 degrees in the summer. I have an insulated garage door. The garage has a sheetrock ceiling and attic space above that is connected to the rest of the ...
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0answers
28 views

Exhaust fan and corresponding power switch in each of two bathrooms, with both fans being turned on simultaneously by actuating either switch

Each of two bathrooms in the Condo we just purchased, has a ceiling exhaust fan and corresponding control switch. For some reason, changing the state of the fan in either bathroom, by changing its ...
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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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0answers
27 views

Replacing a kitchen exhaust fan

Here's an exhaust fan in the ceiling of a kitchen that's probably around 40-50 years old: A non-contact voltage detector shows that the fan does get power when the wall switch is flipped on. However ...
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1answer
46 views

Wall exhaust fan

I'd like to install a wall exhaust fan, similar to this one. I want to wire it so I can plug it into an outlet as I dont want to tear through drywall. Which type of plug/wires would I need? The fan ...
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1answer
20 views

Cutting out existing steel duct in bathroom vent

I'm enlarging my bathroom vent. It's a brick wall and currently has a steel duct. I've chipped away brick but the lip of the existing steel duct is still there. I need to remove around 2 inches of it. ...
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19 views

Garage gable fan through truss

I'm looking to install a ventilation fan in my garage. I want to install it in the middle (mainly for looks) rather than having it offset to one side or the other. Am I OK to cut through the middle ...
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1answer
38 views

How to re-purpose an exhaust fan using a 10x3.25 duct?

I'm currently remodeling my kitchen. Instead of a cooktop hood, I plan to re-use the existing ceiling exhaust fan. It looks to be about a 8" diameter fan that is inside a 10x3.25 duct that exhausts ...
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2answers
385 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
107 views

Wiring for light switch and exhaust fan

Let me start by saying I don't really know what I am talking about, so my vocabulary may be incorrect. This is all based upon my best interpretation of the problem. I am replacing some old light ...
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3answers
123 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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5answers
2k views

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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27 views

Diagnose poorly functioning whole house fan

I installed an AirScape3.5e whole house fan. I don't think the fan is operating at its max potential. It just doesn't seem to cool the house down very much when running even when the outdoor ...
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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
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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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
27 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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0answers
62 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
10k views

Air conditioning with exhaust fans between two rooms

I'm renovating a space where there will be a partition of 2 rooms (3m height, dimensions are approximates, high humidity location, 23-34degC avg outside temp) Room 1: 5x7m Room 2: 2x7m Room 1 will ...
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1answer
38 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
616 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
47 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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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 ...
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1answer
57 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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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
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 ...
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1answer
879 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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3answers
502 views

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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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 ...