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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15 views

Bath exhaust fan issue

We closed on this new construction townhome in January 2014. 6 1/2 years later, cleaning the Panasonic exhaust fans in all 4 bathrooms, to my astonishment, basement bathroom fan has no ductwork. Fan ...
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3answers
116 views

What is the name of this plug/socket combo from a rangehood?

I have a rangehood with some lights for illumination. But they're expensive lamps, mains voltage, not very bright and they run hot. So I'm looking to remove and replace with something LED based. ...
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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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1answer
27 views

Type of insulation for flexible aluminum duct?

I’m replacing an undersized bathroom exhaust fan with a larger one that has a higher CFM. When switching the fan out, I want to add insulation to the flexible aluminum duct that goes from the fan to ...
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2answers
31 views

Ventless vs nonventless

We are remodeling a bathroom. Currently it has an exhaust fan vented through the attic. We purchased a Broan roomside series surface shield. (No attic access required with ezduct connector, no attic ...
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0answers
34 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
486 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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34 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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21 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
28 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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4answers
5k 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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1answer
21 views

AC switch with two mutualy exclusive power lines

I have deconstructed my bathroom fan and found three wires coming from the wall: N -- neutral A -- has 230V only when light switch is on B -- has 230V only when light switch is off I wonder how ...
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1answer
54 views

How to protect exposed bathroom fan wiring

I‘m replacing a builder’s bathroom vent fan and housing. I have two problems. The new housing’s knockout cover is missing. Manufacturer doesn’t have a replacement. The (rigid metallic) conduit leaves ...
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2answers
36 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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1answer
118 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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2answers
42 views

New gas range setting off smoke/gas detectors

I converted our kitchen's range to gas. The gas line was installed professionally but I connected the new stove. As part of setup I heated the oven to 350 to test the burners. Soon after reaching ...
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0answers
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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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2answers
4k views

Bathroom in-wall exhaust fan with dimmer?

In searching this SE, I see many questions discussing traditional ceiling fans and dimmer switches. This question revolves around bathroom in-wall exhaust fans and dimmer switches. Is it safe to ...
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1answer
68 views

Exhaust fan and light on same switch

I want to add an exhaust fan to my bathroom. Do I run power from the light switch to power the fan or do I run power from the light box. Thanks as of now there is a single pole do i use a double pole ...
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42 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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1answer
106 views

Bathroom fan duct connection for maintainability

There are many questions on here about installing duct work for bathroom fans, but I have a more specific question. I am planning to use rigid duct for a new bathroom fan where there was none ...
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2answers
31k views

How can I seal the gap around a bathroom exhaust fan?

I've got my exhaust fan installed in the ceiling of the bathroom, now I'm wonder how best to seal the gap around it. The fan housing is obviously sheet metal, and the ceiling has the plastic vapor ...
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1answer
32 views

Need help with wiring for bathroom fan

I am trying to replace my bathroom fan. The old fan had a light, but I am replacing it with a basic fan with no light (Hampton Bay #BPT13-14MG). The ceiling has two pipes that each have one white ...
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2answers
31 views

Old bathroom exhaust fan replacement

Hope everyone is safe and well. My house came with this old bathroom exhaust fan. The fan works but I feel it is not strong enough for the bathroom as my mirror and bathroom become foggy during a ...
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1answer
24 views

Humidity sensor switch wired to current setup

I have a DewStop FS-300-W1 humidity sensor that replaces a light switch that has a red, black, white and green wires. I want to replace the left most switch (that currently controls the fan) with the ...
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1answer
30 views

Bathfan Exhaust

I have a ERV (brand Van EE 40+) attached to my HVAC system. I am ducting a 3 pc basement washroom and would like to tie the bath fan into the ERV exhaust air flow as I have very limited options ...
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2answers
4k views

Possible source of dripping from bathroom exhaust fan?

During the winter, I experienced "Chinese water torture". The bathroom exhaust fan is located above the toilet. While seated on the throne, drops of water would hit my head every so many seconds. ...
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0answers
15 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
38 views

How to handle air condenser with garage addition

I'm planning a garage addition onto my house and want to know what the best way to handle existing A/C condenser units that are there is. The current setup is as follows (with the C's being the ...
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1answer
69 views

How to wire garage exhaust fan to Humidity sensor/fan control and VENTILATION CONTROLLER

I'm installing this exhaust fan in my garage:(https://www.industrialfansdirect.com/products/ff700). I also want to install this garage ventilation controller: (https://www.aircycler.com/pages/...
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2answers
17k 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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5answers
9k views

Bathroom exhaust fan without duct

I just found out that our bathroom exhaust fan has no duct attached to it. Our current fan is Panasonic FV-08VQ2 (90 CFM, 4" duct diameter). The fan just blows the air to the inaccessible attic. There ...
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2answers
9k views

bathroom fan does not turn on, just hums for 2 minutes then finally starts up

Lately every once in a while, when I turn on my bathroom fan, it does not start up. Rather there is this low humming sound for about 2 minutes. Then finally, the fan starts to run. Why does this ...
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1answer
72 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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1answer
39 views

Wiring bathroom exhaust

Having trouble wiring my fan to work with the switch. It either constantly runs or just doesn’t. Any help would be greatly appreciated.
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2answers
63 views

How do we wire a new bathroom exhaust fan to our bathroom?

In our attic we have a junction box that has the power wire connected to a hallway ceiling light. Can we tap into that to get power to install a bathroom exhaust fan? We would be putting in a double ...
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5answers
3k views

Will it cause problems to shower without the exhaust fan and only turn it on afterwards?

If the exhaust fan was not turned on until after the shower is complete (say, 30 min. after the water is first turned on), is that enough to cause mold/mildew/paint issues? The mirror is foggy during ...
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1answer
5k views

Exhaust fan venting through soffit where attic has no vent

I am installing a bathroom exhaust fan in a portion of the house which is a small addition to the original house. The attic above the addition is separated from the rest of the attic by the original ...
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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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2answers
121 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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2answers
59 views

Do I need ductwork for a through-wall exhaust fan?

We have a small wine fridge beneath our counter that was having temperature problems because there was no ventilation to allow the heat to exhaust. The other side of the wall behind the fridge is a ...
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1answer
51 views

Bathroom ventilation system with electric fan

tl;dr Why am I prohibited from using electric fan in natural / gravitational ventilation system, if there is an additional 2,5 meter long horizontal pipe between ventilated bathroom and the wall? Two ...
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2answers
86 views

Are these bathroom vents?

I was looking at a house and the bathrooms appear to have no exhaust fans. It does have these little things that look like they might be vents of some sort. Could they be sufficient for ventilation to ...
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1answer
95 views

Can I vent a stove hood and bathroom fan through the same duct?

I'm adding a stove hood and a bathroom exhaust fan. They will be about 3 feet apart in the attic. Is it ok to connect them to the same duct via a Y? Thanks!
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1answer
130 views

How to accurately measure CFM with Digital Anemometer and Duct

We bought a digital anemometer to check the CFM of various fans we have on hand. My husband designed and 3D Printed this duct that securely mounts fans on to the anemometer for accurate readings, ...
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0answers
25 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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1answer
1k views

Is it possible to retrofit an external kitchen fan in an existing house?

I have a 2-storey half duplex that was built in 2008. The kitchen (1st floor) has a range hood fan that exhausts to the side of the house through 8" aluminum duct. The outside vent is not directly ...
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1answer
88 views

Re-purpose old water heater vent for bathroom exhaust fans

We just had our old gas water heater replaced with a tankless unit, so the vent for the old tank is now unused. I'd like to install exhaust fans in our 2 small bathrooms, and ideally use the old vent ...
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1answer
28 views

Are there advantages to flex duct over sheet metal for bathroom fan (other than ease of installation)?

Working on the bathroom in a currently unfinished basement and installing a fan. I have 4" sheet metal duct to use, but I know it would be a lot easier to install flex duct. I have a straight shot of ...
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6answers
44k views

Do I need a vent fan in an interior laundry room?

I am renovating a few rooms including an existing laundry room. It currently has one exterior window and another openable window onto an existing mudroom (which also has exterior windows). After the ...

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