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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42 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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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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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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1answer
37 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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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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2answers
61 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
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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18 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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4answers
99 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
31 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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52 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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1answer
34 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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45 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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2answers
67 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
84 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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26 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
80 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
82 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
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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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
26 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
46 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
56 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
926 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
716 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
372 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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1answer
40 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
78 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
139 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
300 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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1answer
33 views

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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1answer
518 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
176 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
66 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
250 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
108 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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401 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
1k 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
324 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
715 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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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
42 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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32 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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269 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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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
112 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
754 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
587 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 ...