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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96 views

Why is my dryer producing condensation and wet inside when it is not in use?

During the recent one year, I have noticed my dryer is producing condensation and wet inside when it is not in use. I live in a 5 units apartment building and I am on the top floor. After I cleaned ...
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119 views

Replacing Exhaust Fan in Bathroom and connecting to semi rigid aluminum duct

I am replacing my exhaust fan in the bathroom and having a hard time connecting the new fan to the aluminum semi rigid duct, because is hard to compress, extend or curve. How can I make this easier ? ...
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18 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
66 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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15 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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28 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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42 views

How do I connect my new bathroom exhaust fan to the old duct that isn't lined up for the new fan?

The old fan died, and I'm trying to install a replacement. The old one was 80CFM, and, despite it working 24x7, the groundfloor bathroom was always a little damp. The new one is a fancy Panasonic, ...
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1answer
26 views

Ceiling fan/light in bathroom shortcuts when humid

I have a ceiling fan/light combo in my bathroom ceiling. It's hooked up with those white connectors you see on this picture: When someone takes long showers, especially at night when the temperature ...
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1answer
142 views

How to wire garage exhaust fan to humidity sensor/fan control and ventilation controller

I'm installing this exhaust fan in my garage. I also want to install this garage ventilation controller, which is triggered when doors open and by temperature. I also want to install a humidistat/...
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27 views

Rewire bathroom light / fan

We have a half bath that has a switch outside the door and another switch near the mirror/vanity inside. The switch outside turns on a light at the ceiling and a (very loud) fan, and the switch ...
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34 views

Can I use a remote (inline) blower with a range hood that has its own blower, if I remove the built-in blower?

I would like to install a remote blower (inline probably) and a new range hood, mostly for noise levels. The thing is, I see two categories of hood: -'Consumer' grade ones with internal blowers that ...
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1answer
99 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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46 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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91 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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901 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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2k 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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3k 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 ...
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59 views

Can mold growth be removed and cleaned up in a two-story apartment building successfully?

I live in an apartment building that has 24 units which all the bathrooms vent into the hollow walls or their neighbors bathrooms upstairs. (so in their ceiling, the smell and moisture comes out ...
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220 views

Can a horizontally-vented kitchen exhaust have a downward-facing outlet in a soffit?

Can I vent a kitchen exhaust fan horizontally to an exterior soffit, ending with a downward outlet/cap? (Or must the outlet be horizontal (through a wall) or upwards (through a roof)?
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2k views

How can I tell if my bathroom ceiling vent is working properly?

Seems to take the vent forever to clear shower vapor from room. I purchased a vent that had a good rating. It is vented to the outside. How do I know if it is working properly and actually venting to ...
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4k views

How do I wire a bathroom exhaust fan/light to two switches?

I could use a diagram to wire the following: a bathroom exhaust fan with light on two separate switches. I also need a 3rd switch for a vanity light and a GFCI. My power comes from the attic (12/2 ...
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1answer
45 views

In-line fan installation

Can an In-line bathroom fan be installed horizontally or just vertically ? Been searching all over but no manufacturer specify that on their guide. Thank you
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4answers
551 views

Combatting moisture in crawl space after venting window is sprayed with insulation?

I had a crawl space (top left) in my house which had a 12"x6" venting window. There is a room above the crawl space, so I decided to spray the walls of the space with closed-cell foam insulation which ...
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1answer
41 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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10 views

Bosch range hood fan low hum and not sucking air

Something is wrong with my Bosch range hood fan. It was working on low but when I switched it to high it started making a low humming sound like it was really struggling and not sucking up air at all. ...
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1answer
46 views

Bathroom exhaust fan and light switch separation

new here and I tried the search but can’t seem to find an answer to what I’ve got. In my bathroom, I have 2 switches. When top switch is on, bottom off, the vanity light and the exhaust fan light ...
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33 views

Ductless 1/2 Bath Vent - yes or no?

From what I can understand, code says any bath fan needs to be vented to the outside. I live in Denver, CO and have been told that I can use just a charcoal ductless fan in the half bath we are ...
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1answer
69 views

How to remove this ancient exhaust fan?

It seems to be held in by those metal strips that I can't budge.The wood that it's up against is thin- only about 1/4 inch. And the metal part starts/stops at the visible wood and extends beyond sight ...
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44 views

Venting a hot garage, how much cooler can it get with an exhaust fan?

I life in Miami and the garage gets very hot in the summer and I am trying to cool it down so I can workout in it. The basics are: I'm looking at this product: iLiving - 10" Wall Mounted Exhaust ...
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29 views

Exhaust fan in Toilet room off the master bath

I understand it is code for exhaust fan in the Toilet room (Small 4x5 room with door) this room is off the main master bathroom. Do I need another exhaust for the main bathroom for code? Can I put a ...
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1answer
76 views

Help wiring a bathroom exhaust fan/light combo on a single switch

I currently have a single pole light switch that powers a exhaust fan/light combo unit. I am replacing the old unit since the motor blew on it. The wiring coming from the ceiling is black, white, red, ...
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2answers
45 views

How to find a non-switched wire in attic

I'm trying to add a whole house fan in the attic. Currently there are many power cables in the attic and as far as I know, they all feed lights and bathroom fans - implying they are all switched. ...
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43 views

CFM ratings of inline duct fans far exceed the ratings for their intended duct sizes. What are we to make of this when designing a system?

My garage is 25×29' with 10' ceilings, so 7250 cf. I'm hoping to be able to turn over the air every 3 minutes or so, so aiming at using 2 fans rated at a total of 2400cfm. The fans I'd like to use ...
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342 views

Bathroom exhust fan ducting - size, length & CFM

Still trying to solve my problem of bathroom vent fans that aren't vented anywhere... Was considering running out the gable, but that's 25' away, plus another 10-15' of duct and a couple of elbows to ...
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74 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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31 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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118 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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31 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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2answers
267 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
65 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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28 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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65 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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22 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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563 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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288 views

How to convert bathroom ceiling exhaust fan to a ceiling fan

I'd like to remove a bathroom exhaust fan and in it's place install a small ceiling fan for better circulation. This bathroom does have a window that opens so I'm not concerned about code nor ...
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1answer
153 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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2k views

Bathroom exhaust/light combo - light doesn't come on until fan on

In our guest bathroom, we have a fan/exhaust combo with 2 switches. Today my wife noticed that the light wouldn't turn on until she turned the fan on. Then she could turn the fan off and the light ...
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1answer
536 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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329 views

How to insulate whole house fan opening for the winter (from the inside)?

There is a 3'x3' opening in the ceiling of my second (top) floor. The opening leads into the unheated attic. I want to both seal and insulate this opening to keep out the cold in the winter. (I live ...
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493 views

Increasing exhaust fan duct size

I have a bathroom exhaust fan that has a 3 inch duct outlet. However, I would like to use a 4 inch insulated flexible duct. Is there an adapter I can use to accomplish this or do I have to first use ...