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
45 views

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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1answer
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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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3answers
63 views

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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0answers
35 views

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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2answers
61 views

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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37 views

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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41 views

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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1answer
25 views

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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2answers
1k views

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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49 views

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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1answer
45 views

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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1answer
39 views

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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1answer
92 views

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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2answers
138 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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1answer
24 views

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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1answer
38 views

Can I go with higher CFM for bathroom ventilation fan?

I need to replace my bathroom ventilation fan. I am in 2nd floor condominium. My bathroom dimensions are 60 square feet and ceiling height is 8'2". As per formula I found for CFM (height × length ...
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1answer
44 views

Bathroom Exhaust Fan with Light - Wiring

I have a new bathroom exhaust fan and light unit replacing an older unit of the same. Two switches — one for light and one for fan. The wiring instructions show. I have 4 wires coming to the unit. 2 ...
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0answers
60 views

Can I vent my bathroom with Air Return Grilles?

My apartment’s small full bathroom is about 50 sq ft, and there was an old Non-Vented Air Recirculating Fan in the ceiling. It died but there was still moisture/mold/mildew issues when it worked. I ...
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1answer
76 views

How to ground a kitchen exhaust blower fan?

Recently our kitchen exhaust fan stopped working, only humming and not moving. In the kitchen there's a butterfly damper, the exhaust switch is on the vent hood, and the motor and exhaust fan are on ...
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1answer
57 views

Kitchen exhaust fan vent pipe

We had professionally installed kitchen exhaust vent, venting outside. We had 300cfm and we were having smell issue in the house even after venting outside. We replaced the fan with 900 cfm and ...
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1answer
77 views

Are there issues with venting a bathroom fan through the roof soffit?

When I purchased my house, during the home inspection it was indicated that the bathroom vent is simply discharging directly into the attic space. Because we were concerned about mold in the attic, we'...
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3answers
76 views

How to hang exhaust fan with limited amount of space?

Ive added a small bathroom in my basement with a drop ceiling. I have limited amount of space to work with. Is it ok to use chain to hang my exhaust fan?
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178 views

Rats in range hood

I’ve just discovered I have rats in my range hood above my stove top in my kitchen. I’ve turned the fan on and heard a lot of squealing and crunches. Can clearly see the rat aswell stuck in the fan. ...
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1answer
43 views

Bathroon light and ceiling exhaust fan wiring?

I feel like this is something I should be able to do but after reading similar threads I'm still confused: My bathroom is setup with two 12/2 wires coming into the switch box. One I know for sure goes ...
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2answers
496 views

New bathroom fan has 2 green wires but i do not know where to connect them

A new bathroom fan I want to install has 2 green and 1 each white and black. The line in the attic consists of a white, a black and a ground. What do I do with the 2 green wires?
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1answer
30 views

Entertainment Area is cooling required with this setup? Where to position fans?

I am getting my entertainment area setup and I wanted to get opinions on where I should install intake/exhaust fans and if it would even be required. Within my "nitch" I am going to have an ...
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3answers
50 views

Replacing Bathroom Vent Fan

Looking to replace a bathroom vent fan in a property that is being renovated. The exhaust fan was not working, upon further inspection it seems to be the motor that is causing the issue. I want to ...
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1answer
71 views

Fan wiring no switch, only using humidity sensor for control

Putting in an exhaust fan for a bathroom that did not have one previously. Purchased one that has a humidity sensor and was looking to use that for the sole means of control (dont trust the kids to ...
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1answer
85 views

Repair crumbling edges of deliberate (wanted) hole in plaster ceiling

In my bathroom, there is an extractor fan mounted in the plasterboard/drywall ceiling. It's there to remove moisture and stale air. Naturally, there is a hole through which the fan fits, and the fan ...
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0answers
30 views

Is there a way to upgrade an existing bathroom light exhaust fan to include heater without having to rewire the entire switch?

I need to upgrade an existing bathroom light exhaust fan to include heater, however there is only one wire/switch going to the current exhaust fan which runs both the light and the exhaust fan. Is ...
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1answer
422 views

How to rewire a microwave exhaust fan to work as a stand alone exhaust fan?

Have a used microwave oven exhaust fan which I plan to use as a stand alone fan. The wiring on the fan is the enclosed picture. The question is how do I wire this to work as a stand alone fan? Update:...
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1answer
579 views

New timer switch has a blue wire instead of red wire

I just replaced a mechanical timer switch (noisy) with a digital switch. The old switch had red, white, and black wires and the new switch has red, white, blue wires. I simply connected the new blue ...
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5answers
3k views

Does a portable fan work for drying the bathroom?

If a bathroom has no windows and doesn't get completely dry after a shower (neither do the towels, and the ceiling starts to grow black spots of mold), can a regular fan dry everything after the ...
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1answer
294 views

Where can I find a replacement bathroom fan with this uncommon electrical plug? [closed]

I’m replacing my bathroom exhaust fan. I planned to do this myself and watched a few how-tos. It looked easy. You basically just plug the new one in. The thing is that our bathroom fan seems to have a ...
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2answers
780 views

Is a bathroom required by code to have a window or exhaust fan?

The Fort Lauderdale, Florida unit is on the top floor and there is a duct for the unit's central air in the bathroom, but it doesn't have a window or exhaust fan. Is this not to code? What are my ...
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1answer
57 views

How to access OTR microwave exhaust vent/ducting

I currently have an OTR microwave that is externally vented The exhaust vent for the microwave is concealed by cabinets above the microwave, and inside the cabinets the ducting itself is concealed by ...
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2answers
269 views

four way switch to three way for vent fan

Currently there is a ventilation switch on the wall, which has 14/2 leading to a relay which will turn on my furnace and newly installed HRV. It also turns on the bathroom fan in the nearby bathroom. ...
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0answers
106 views

Can I safely drill a four inch hole in a brick load bearing wall?

I need to drill a four inch hole in a brick load bearing external wall for a kitchen fan. Is there much risk of affecting the structural integrity of the building? It is a two storey building and the ...
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0answers
26 views

Ventilating a flat roof

My ensuite bathroom has a major humidity problem. I took the fan out (it's one of those combo heat lamp + light + fan units) expecting the fan to be broken, but found another problem - it's just ...
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1answer
76 views

What is the correct placement of a 2nd story through-wall bathroom vent

I have a 2nd story bathroom which is a little too humid unless the window is left cracked all the time, greatly decreasing the efficiency of our HVAC system. I would like to install a bathroom fan ...
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3answers
296 views

Is it safe to have 3-switch light-vent-heater on 20 amp circuit with another light switch and a GFCI outlet?

Downstairs bathroom has a dedicated 20 amp crcuit. First in line is a GFCI outlet which trips the downstream light switch (for over mirror light) and a three-switch (for ceiling vent/light/heater ...
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3answers
500 views

Why is the white wire hot in an bath exhaust fan switch circuit?

Tried to figure this out from previous posts but am still confused, and afraid. Our 30 year old exhaust fan had a light, fan and heater. We're replacing it with a fan/light combo, no heater. The ...
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0answers
20 views

HRV Supply/Blower making a terrible sound

Here is a video (with sound): https://streamable.com/w8tgqk (You have to go about 0:20 in to hear the sound). I got unlucky during recording and the sound was more intermittent, but normally it's loud ...
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1answer
250 views

Ventilating a cat box through the dryer exhaust duct

I have a small closet that doubles as a laundry room, with a stacked washer and dryer. It's also where I keep my cat's litter box. It occurred to me that I could probably reduce the odor of the litter ...
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0answers
35 views

bathroom switches into a pir/motion sensor

I have a two switch box in my bathroom that controls a ceiling fan and light. I bought a TDHOS5, Dual Technology Humidity/PIR Motion sensor with the goal of replacing both switches. I can’t seem to ...
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1answer
119 views

Any issues wiring bathroom exhaust fan to low-voltage heated mirror?

I'm in Maryland, US. I was hoping to wire from the switch: https://smile.amazon.com/gp/product/B01CXXZV96/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 to this: https://www.clearmirror.com/...
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0answers
18 views

Options to route bathroom exhaust fan

I am trying to install a bathroom exhaust fan but I am not seeing a real good way to get outside. The first picture below shows my ideal spot for the fan represented by the new work box. If I were to ...
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0answers
40 views

Bathroom fan wiring

I am trying to install a bathroom fan and am having some issues. The sketch below is how I curently have it wired. (blue in the sketch are the white wires) Previousy there was a single switch that ...
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1answer
57 views

Wiring for new bathroom fan

I am trying to add a fan in a bathroom and need some wiring assistance. I removed the switch thet controls the overhead light and found 2 black wires attached. From the research I have done it seems ...

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