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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7 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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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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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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33 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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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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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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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
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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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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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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67 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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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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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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5answers
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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
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
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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
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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1answer
37 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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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
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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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
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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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
129 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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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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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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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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1answer
60 views

Range hood impeller slipping on rotor shaft

My range hood has a motor with an impeller on it. The impeller is attached to the rotor shaft by a nut that threads onto the impeller's... bushing I guess it's called, which is slotted, so that as the ...
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1answer
227 views

Replacing timer with no neutral wire

I bought replacement for my bathroom exhaust fan. Basically what i bought was this: https://www.homedepot.com/p/Hampton-Bay-50-CFM-Wall-Ceiling-Mount-Roomside-Installation-Bathroom-Exhaust-Fan-ENERGY-...
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5answers
196 views

Fans in bathrooms

I just wanted to know what year did bathroom fans begin being put in houses. The house I grew up in was built in the 20's and didn't have a fan. There was a window.
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1answer
416 views

Separating 12-3 wire from panel to feed a bathroom fan and light

I am replacing an existing heater, light, night light, exhaust fan unit with a new unit that only contains a light and exhaust fan. The existing wiring has a 12-3 coming straight from the panel with ...
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2answers
1k views

Bathroom fan fluctuates in power when using countdown timer switch

I just installed this new fan in the bathroom: Utilitech Ventilation Fan 1.5-Sone 100-CFM White Bathroom Fan However, if I use regular toggle switch, it works fine. But if I use countdown timer ...
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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
83 views

Do I have to have an exhaust fan above my stove?

My stove is smack dab next to the back door (which is easy to open and close). Do I have to have a functioning exhaust fan? Or can I just close it off to solve a draft problem I am having? And same ...
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1answer
73 views

What should I do about no ground wire

I bought a new bath fan for my old house(1920s). Where the fan is installed, there is a power/black, and a neutral, but no ground wire to connect to it. It's old knob and tube wiring. Is no ground ...
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2answers
70 views

Calculating flow volume for whole house fan

My house has a 24" Dayton belt drive whole house fan that's at least 20 years old but looks exactly like the current model 2EAX5. It's nice and quiet but I want it to move more air. It has a 1/3hp ...
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212 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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2answers
87 views

Bathroom Vent - exhausts into attic insulation - what to do today?

So my wife called my attention the fact that the kids bathroom has some grunge on the ceiling and tends to have lots of water drops when in use. First issue - at some point the vent motor was ...
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1answer
48 views

How to replace bathroom fan?

For about two years now, two of my bathroom fans have not worked and I haven't gotten around to changing them. But I am wondering the best way to replace it. The current fan/light I have installed is ...
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2answers
63 views

How can I increase the effectiveness of my bathroom vent fan?

The vent fan in my bathroom isn't very effective. After taking a shower, the bathroom takes several hours to dry out. The fan itself works fine: it generates almost enough static suction to hold a ...
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1answer
245 views

How should I apply spray foam around a ceiling mounted bathroom exhaust vent?

I have a ceiling mounted exhaust fan that has a substantial (2-4" air gap along the sides after it was installed such that when it is running a lot of the air just gets pushed back around the sides of ...
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3answers
56 views

Identify this bathroom extractor fan?

I have a bathroom extractor fan that has gone bad, so I need to replace it. If possible, I would like to just replace the motor, rather than opening up the ceiling to put in a whole new enclosure. The ...

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