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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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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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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2answers
3k views

Whole house fan possible with vaulted ceiling?

I live in an area where I think a whole-house fan would be a big benefit. But my upper floor has a vaulted ceiling. I don't know anything about the construction. There is a ceiling fan, but it ...
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2answers
370 views

Upgrade bathroom light and separate exhaust fan

I Have a small bathroom and it has a light that is separate from the exhaust fan. I want to upgrade it to a light and fan combo. Can this be done easily without having to go into the attic? I ...
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2answers
9k views

Are there drawbacks to installing a stronger bath fan?

I have a bathroom fan that doesn't seem to be doing the job. I'd like to replace it with something that has much higher CFM (jet speed); is there any reason not to do this? Is it possible that it can ...
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2answers
1k views

How can I prevent a bathroom fan from vibrating?

I am replacing the ventilation fan in our master bathroom this weekend. The previous one (about 12 years old) developed such a vibration over time that it managed to undo the bolt holding the glass ...
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1answer
237 views

Exhaust fan leaking from elbow joint connected to the ceiling

I have a metal elbow joint that is leaking. It is connected to an exhaust fan in the bathroom and runs to the roof. What can I wrap the elbow with to stop the leak?
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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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2answers
88 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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1answer
79 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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236 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
864 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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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
488 views

Turn on one light, when another is turned off

I just bought a bathroom fan which needs a seperate wire to control the fan, light, nighlight and humidity control. Each one is designed to be wired to a separate switch, not an ideal design. I'm ...
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2answers
1k views

Vent AV closet into attic

I have a small closet (4x6) that I use to house my AV equipment (receiver/consoles/etc). This works great, but as the closet is in an upstairs room it gets quite warm in the summer. I would like to ...
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1answer
478 views

Old extractor fan hole leaking water into new kitchen

We had a new kitchen fitted last year, including a new extractor fan above the gas hob. When the previous extractor was removed it revealed the drilled hole and pipe which although lined up perfectly ...
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1answer
4k views

Ceiling exhaust fan in kitchen

We have both a range hood and an exhaust fan in our kitchen. I'm not really sure that the range hood actually exhausts outside the house, as there's not much room (a couple inches) behind the ...
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1answer
2k views

replaceing a toggle switch for EXHAUST fan for small bathroom with a rocker switch

I have a bathroom with two separate toggle switches; one for the light and one for the exhaust fan. I have updated the light switch with a dimmer/motion sensor rocker style switch. Now, my question is:...
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2answers
743 views

Gable venting a bathroom fan and kitchen range hood

I am planning on venting my bathroom fan and the range hood in my kitchen out the gable end of my house in separate runs. The gable end is above a gable roof, so I am hoping for some recommendations ...
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426 views

How do I wire challenging bath situation

I have opened up my bath with studs and ceiling exposed. I have one power source going into the room. I have : Ventilation Fan/Light/Night light 3 switch for one gang box Vanity light that I wish ...
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1answer
336 views

My upstairs bathroom fans don't vent properly, how should I handle this?

I just noticed this weekend that neither of my upstairs bathrooms exhaust fans vent properly. I hear the sound of the fan, but as google has told me, when I put toilet paper on the fan it doesn't ...
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2answers
1k views

What bathroom vents/ceiling/roof vents and fans are most recommended?

I need to vent a room in an uninsulated cabin - the ceiling is also the roof - so I don't need soffit tubing or anything like that. I am looking for a fairly cheap item that has a large cfm ability. ...
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1answer
35 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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3answers
450 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
106 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
44 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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4answers
857 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
638 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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1answer
72 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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3answers
641 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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3answers
141 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
218 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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3answers
5k views

Why don't whole house fans vent to the outside?

I've been researching fans and the ones I've found all seem to vent to the attic. Why is that? Why can't they vent directly to the outside? It seems more efficient that way. Otherwise you have to have ...
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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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43 views

Kitchen fan venting

I am installing a kitchen fan about 9' away from the nearest external wall. The wall there is very narrow and all I can fit there is a dryer type vent that works with 4" round pipe. Also, my spacing ...
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1answer
298 views

Clickey clackey bathroom exhaust louver

I have a bathroom exhaust vent with louvers similar to the image below. It vents out the side of the house above the bathroom between two bedrooms. When it's breezy out, the flaps rattle so that it ...
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1answer
901 views

Home: Using Exhaust & Circulating Fans to Improve Air Quality While Staying Cool

In the hopes of ventilating nasty odors and airborne contaminants, I recently installed the Bionaire BW2300 in one of my kitchen windows. This is the only one I have installed in my home at the moment....
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1answer
152 views

light and fan. together but separate

Currently I have a switch that turns the light on and off, and a second switch that turns the fan on and off. I would like to make it so the fan can only turn on if the light is on as well. But if the ...
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1answer
666 views

What are my options on location of a bathroom fan vent in Wisconsin?

I just put in a new bathroom fan and noticed the previous one was vented into the attic. I understand this can cause mold after awhile. I live in WI where we see a lot of snow. I was told the roof ...
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3answers
13k views

Replacing Bathroom vent, heat light combo and wiring is weird

I am replacing a bathroom vent, light, heater combo. The wiring from the house has three switches, but has only two lines with three wires (black, white and ground). The new vent, light and heater has ...
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1answer
1k views

Should I keep a bathroom door open or closed to keep it from expanding?

Should I keep the bathroom door open or shut after a shower to keep it from expanding? What if the fan is on as well?
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1answer
850 views

Is continuous exhaust from basement level closet a good idea?

I have a recurring problem with mold in the closet of a basement level bedroom. After considering various options, I'm currently contemplating installing some sort of a low powered continuous exhaust ...
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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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34 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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61 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
83 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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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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467 views

How can I add a dimmer to a bathroom switch that also turns the fan on?

I would like to add a dimmer switch to the bathroom. The switch currently turns on a extractor fan with a timer. It is connected via an isolation switch. I understand I cannot run the fan on a dimmer ...
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1k views

Bathroom exhaust fan through clay tile roof

I've installed an exhaust fan in an upstairs bathroom and need to vent it through the clay tile roof. (pic attached) The standard 4" pipe jacks and flashings I'm finding at Home Depot don't seem to ...
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2k views

Using PVC pipe for bathroom exhaust fan duct

I have to run a length of about 3 meters of duct (from the fan to the outside), where there will be 2 90° bends. I was going to use plastic flexduct, but I can make the bends bends and some of length ...