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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Question about duct work replacing a bathroom fan

I am replacing a bathroom exhaust fan with a humidity sensing model that automatically turns on when a specified humidity level is reached. The original duct is 3" wide. I had to get a 4" to ...
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Costco CST80SL fan wiring

I want to replace my old bathroom fan with a CST80SL BROAN bathroom fan. Originally, there are two switches in my bathroom, one for bathroom fan and the other for bathroom light. My question is can ...
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1 answer
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Bathroom vent is noisy when it's windy outside

The vent fans in our bathrooms make loud clapping noises when it's windy. I can open/close the doors to the bathroom quickly and hear the flap clapping because of the pressure change. Is this ...
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2 votes
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What's the right way to bypass non-functional ballast in bathroom exhaust?

My home has Nutone 769RLN "B" unit exhaust fan with light on them (763RL/769RL "A" Unit). The lights contain ballasts and have a provision to use 13W CFL with a G24q-1 base. ...
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How should I connect my new bathroom light fixture?

I am replacing the light fixture in the bathroom. The old one has a fan, light and heater and so does the new one. I am unsure if I should connect any wires back to the white wire with the copper. I ...
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Why would my bathroom fan light receptacle not work with LED bulbs?

Replaced the bathroom fan last week with a fan/light combo. It's driven off the same switch for both the fan and the light. I had put in an LED bulb last week when i replaced it and its been working ...
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How to mount an attic gable fan to reduce vibration in the rest of the house?

How can I reduce noise and vibration that's transmitted from an an attic gable fan to the rest of the house? Currently, the fan is mounted via screws to studs on the gable. Even when the fan is ...
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3 votes
3 answers
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Trying to replace bathroom vent, but housing is stapled to the rafter

I have a Broan 688 vent in my bathroom. It's incredibly loud, and it doesn't have a light. I bought a Revent replacement from home depot, which is designed to fit the exact cutout as the Broan. ...
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Sealing air gaps around edges of attic gable fan

I just installed a new gable fan to exhaust hot air from my attic. Due to unevenness in my studs and gravity pulling one side of the fan lower than the other, there are small gaps (ranging between 1/8&...
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1 vote
2 answers
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Restroom fan switch replacement

What type of switch would I replace this with? It controls a restroom fan/vent with a light. The light (even though it's part of the restroom fan) is controlled by a separate light switch. Pictured is ...
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installing new exhaust fan to exterior side of the wall

Seeking advice from pro's who have installed a bathroom exhaust fan to exhaust air to the outside on the first floor bathroom on a two story home in Texas. There are generally 2 ways to exhaust air ...
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Installing a humidistat-controlled inline bathroom exhaust fan

We have a master suite bathroom with a corner tub, shower stall, and a sort-of enclosure for the toilet. There's a typical switch-controlled exhaust fan above the toilet that vents out to the roof. My ...
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Will this roof vent installation cause me problems?

I just have my house re-roofed on last November. Recently I look around in the attic and found the new vents and ventilation fan weren't prefect fit the existing holes. Will this situation be a big ...
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5 votes
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What tool/process do I need to remove this bathroom exhaust fan from motor?

Bought a condo where exhaust fans weren't working with the plan to just replace the motors (both fans are identical). Found this replacement motor for the current JA2C463N motors (https://www....
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Replacing old Nutone vent fan, light and heater unit in bathroom

I have three single pole separate switches in the bathroom downstairs. I have three /2 cables coming from downstairs going into the attic. I can get the light to work but not the vent fan and heater. ...
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2 votes
1 answer
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Best position for kitchen exhaust duct flow sensor

*TL;DR: a flow sensor on a kitchen exhaust duct fails to work reliably in its current location. Will moving it down two floors closer to the upstream exhaust hoods help or be a waste of effort? We ...
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How to exhaust a central bathroom (only toilet/sink)

We have an open floor plan, and on the main floor is a bathroom (only a toilet/sink, no shower or tub). The house was built in 1995, and because this is an open floor plan, the vent goes into the ...
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Downstairs WC cold - Extractor or windows?

I have a new build and of course there will be a few niggles here and there, however one of the biggest gripes is that the downstairs WC (toilet) feels chilly when compared with the hallway just the ...
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Advice installing a vent on roof

Installed a new bathroom fan today and realized the ducting is way undersized. 9'x15' room and a very tiny fan with 3" ducting. I replaced it with a 110CFM Panasonic fan. So I can't use the ...
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Air return competes with bathroom fan?

Can my air return be preventing my bathroom exhaust fan from drawing air? We have a terrible time with moisture building up during showers. The air return is on the hall wall directly opposite the ...
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Wiring for Broan-Nutone roomside bath exhaust fan with humidistat?

I have the NuTone® Roomside 110 CFM Humidity Sensing Decorative Ventilation Fan with Round Flat Panel LED Light - model aern110slw. https://www.broan-nutone.com/en-us/product/ventilationfans/...
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Beeps in bathroom ceiling

Exactly every 24 hours I hear 10 secs. beeps (not chirps) coming from the ceiling fan in my bathrooms. Replaced nearby Kidde smoke alarm including wiring and still beeping every day at 11:50am. ...
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I am trying to change my bathroom fan plug, but don't know where to start?

My bathroom fan has not been working for a few years now, and I was thinking of changing it. I tested the wall switch, circuit breaker, GFCI outlet, and I believe the issue is the actual input plug/...
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1 vote
1 answer
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Bathroom fan install with new construction - lip around edge of fan doesn't jive with 'install drywall"

Feeling dumb here. Finishing up a remodel and have a Broan InVent fan with ~1/2" lip around the bottom. The instructions indicate attach the fan to the joists with the bottom 1/2 or 5/8" ...
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Broan 80 CFM Ventilation Fan w/light- why are there 7 wires and what are brown and gray?

I just bought a Broan 80n CFM ventilation fan with light to install in my shower that will replace an existing can light. When looking at my new Broan fan light, there are 7 wires: 1-black, 2-white, ...
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1 vote
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Clearance from a bath external vent to a kitchen external vent?

I know that bath and kitchen vents have to terminate outside a building, at least 3' from the operable portion of a window. What if I have two such vents? Can they come out next to each other? Here ...
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Is water in a bathroom vent pipe avoidable?

My bathroom's fan vents through the ceiling, with a unit like this one: https://www.homedepot.com/p/Broan-NuTone-3-in-to-4-in-Roof-Vent-Kit-for-Round-Duct-Steel-in-Black-RVK1A/100344509 We had some ...
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How do I connect a bathroom fan to existing switches?

I have 6 wires. One white one black and one ground from each bundle of 3. I need to power a vent fan that requires 1 ground 1 white and 1 black. The grounds are easy as they get pigtailed together. My ...
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Exhaust fan from ceiling is dropping water, but the roof might show a bigger problem

I'm living in the Northeast coasts, and I saw my exhaust fan from the ceiling is dropping water this morning. So this afternoon, I access my attic to see the inner roof and see a potentially bigger ...
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1 vote
2 answers
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Bathroom exhaust fan with 6-pin molex (why?)

I have an old Nutone LS-100 (circa 2000) which needs replacement. I noticed that the power connector for the fan unit is a 6pin Molex, which surprised me. This is only an exhaust fan and has no light ...
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Wiring a Broan roomside/flex series Humidity Sensing Fan/Light . I have 2 switches Opt #1, Want only the light. What do I do with the Gray wire?

I am Wiring a Broan roomside/flex series Humidity Sensing Fan/Light . I have 2 switches which is Wiring Option #1 on page 4 of the instructions. I want only the light to work with switch #1. What do ...
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1 vote
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Wiring humidy sensor (with hot+load) instead of 2-way switch

My first post hurray! I am trying to replace a simple 2-way switch that control my fan at the switch box with a humidity sensor and fan control unit. The current wiring is throwing me off (and I have ...
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2 votes
1 answer
64 views

Adding exhaust fan and dedicated switch to existing light end-switch

Renovating my bathroom (Bathroom A) and have all walls exposed to the studs. Power runs from the attic to the light and switch of the adjacent bathroom (Bathroom B), then to the light in Bathroom A, ...
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4 answers
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Powering single HVAC damper from 3 circuits

I am updating a 1993 house in Texas and now have exhaust fans going through the roof, so I am also adding a fresh exterior air intake to the HVAC return plenum for make-up air. I want to open the ...
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Should I trim my bathroom door to improve air extraction?

Current situation My bathroom looks like this: The problem is that I face some mild humidity issues (on ceiling and tile grout), as it is difficult to extract air after having taken a shower. Indeed, ...
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How to connect fan control switch?

I bought a fan control switch to control my exhaust fan. In my socket, there's 3 live, 3 neutral and 3 ground wires. However, the fan control switch circuit diagram only shows the location to connect ...
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4 votes
3 answers
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Better ventilation in semi-enclosed shower area

My home's master bathroom has an oversized step-in shower -- two showerheads, frankly over the top. Bathroom exhaust fan does a fine job preventing moisture build-up in the bathroom during even long ...
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How to correct an old bathroom ceiling vent fan duct (or lack thereof) in an old 2 story house

I'm fixing up an old home, built in 1930s, renovated in 1980s that has a terrifying fire hazard of a bathroom light/vent fan/heater in the downstairs hall bathroom. When this old unit was removed, not ...
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2 answers
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Whole house fan motor size

I am told that my whole house fan motor is no longer repairable. It is a 1/2 HP Robbins & Myers dating from 1966 and weighs about 51#. The Hunter fan documentation says the motor is the right size ...
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Need help with poor attic ventilation

My son's attic is running about ~30 deg hotter than the outside temp in the peak of day and makes the AC work overtime to cool the house. The previous owner re-did the attic/roof, and there are only ...
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What are the proper steps to replace a poorly installed dryer vent in an old flat roof in Phoenix?

The dryer vent extends from a utility wall in the center of the house directly up and through the roof. The current penetration is a simple hole with a dome screen topped by a vent hood. I believe ...
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1 answer
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Toggling off certain light switches cause a specific light to flicker off for ~1 second when it is on

This is condo constructed in 2006. When I moved in (2017) everything worked fine (unless I simply didn't notice?), lights were incandescent. In 2019 I changed the master bathroom light fixture from ...
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7 votes
2 answers
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How can I offset 6" ducting by just a few inches?

I am installing a range hood and due to a ceiling joist in the way, I have to offset the ducting going through the ceiling by about 3" from the center of the hood. I have to do this within about ...
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How to replace or cover a hole left by kitchen fan that vented to nowhere?

I removed my old exhaust fan, and in my naivety I disposed of it prematurely, thinking that I would be able to find a drop in replacement. Either my Google-fu is failing me, they don't make the size ...
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What size duct for make-up air?

I have an industrial exhaust fan venting heat from the top of a stairwell. It is a CentriMaster ModelPRN PRN110 with specification sheet here: http://www.acmefan.com/InformationFiles/ModelInformation/...
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Is 4in pipe OK for range hood with 7in vent?

We bought a 350 CFM range hood with a 7in vent. Our installer ran a 4in diameter flexible aluminum foil air duct horizontally through the floor joists to outside. We are now told the 4in pipe is too ...
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1 vote
1 answer
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Does the wall termination vent for a kitchen range hood need fastened to the duct tightly?

6" duct running out through exterior wall. For my dryer wall vent, I used a pipe clamp to tightly secure the round duct around the outside of the male fitting on the wall vent. I have access to ...
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1 vote
1 answer
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Moving bathroom fan on GFCI outlet

I am replacing my bathroom ventilation fan and moving it right above the shower area. According to code Fan needs to be on GFCI now. Please take a look at picture near vanity wall. On Left there are ...
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1 vote
2 answers
429 views

Rigid or Flexible bathroom exhaust duct

In my 2nd floor condominium, I need to replace bathroom ceiling and exhaust fan. Old ceiling has been removed. My contractor is going to install new ceiling. I want to replace old exhaust fan and duct ...
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Replaced bathroom fan/light

The bathroom fan/light went out and I replaced it. Apparently I did not hook wires up right. There is a black encased wire with hot, neutral, and ground. There is a white encased wire with hot ...
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