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Questions tagged [exhaust-vent]

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36
votes
3answers
5k views

Why do gas water heater exhausts have an air gap before the chimney?

Every conventional (i.e., non-direct-vent) gas water heater I have seen has a roughly 1" vertical gap between its exhaust port and the exhaust vent (or "chimney"). See photo below. What function does ...
12
votes
8answers
30k views

What is the best way to clean your clothes dryer exhaust?

My dryer exhaust goes out of my laundry room, into my attic, and runs for about 15 feet before it gets outside. Over time the lent has built up quite a bit. What is the best way to clean this? The ...
10
votes
2answers
26k views

What are my options for venting a bathroom exhaust fan?

I would like to install a fan in our bathroom which currently has none. However, I'm very confused regarding the best approach for this. Above the bathroom is an attic space. I have read that ...
8
votes
6answers
35k views

Can I modify the vent from my high efficiency furnace to prevent possible damage to the exterior of my home?

is my high efficiency furnace vent installed properly? I'm based in Toronto, Canada. In some recent cold winter weather, the exhaust is causing a lot of ice buildup on the surrounding brick. To my ...
7
votes
4answers
58k views

Why is a gas furnace vented but a gas dryer is not?

I live in a house in Ohio and I have four appliances powered by natural gas: furnace, water heater, dryer, and kitchen range. Of these, only the furnace and water heater are vented to the outside of ...
7
votes
4answers
45k views

Is it possible to vent two exhaust fans through a single wall penetration?

I have two bathroom exhaust fans that need to be vented out of the house, but I'd like to do it using a single wall penetration. Is there a code compliant, safe way to do this? Both bathrooms are on ...
6
votes
4answers
78k views

Can I vent a bathroom through the soffit if I use a product designed for it?

I am looking for some clarification. I have been reading about installing an exhaust fan in a bathroom, and I have been reading that you should always vent to the outside, but I continue to read that ...
6
votes
2answers
1k views

Bathroom Vent Fan Upgrade

I am upgrading an undersized bathroom fan that is 50 CFM and has (possibly) a 3" to 4" exhaust pipe. The new fan, which is 150 CFM requires a 6" exhaust pipe. Do I need to rip out the existing vent ...
6
votes
2answers
1k views

What kind of vent is pictured here and what are its uses?

While my roof was being replaced, I requested that they install two roof vents. One for laundry and one for bathroom fan. They installed two of these. I just tried connecting the bathroom fan to this ...
6
votes
1answer
194 views

Can I route coaxial cable for tv through a gas fireplace?

Cable guy told me to drill a hole from outside in right through sheet metal in gas chimney to connect tv to cable mounted on mantle?
6
votes
7answers
16k views

How do I prevent ice stalagmites from building up on the furnace exhaust?

I have a high efficiency furnace that exhausts via a pvc pipe out the side of the house, the trouble is the moisture from the exhaust forms an ice stalagmite in my driveway in the cold weather. Are ...
5
votes
2answers
27k views

Does the NEC allow electrical wiring to run next to a ventilation duct?

I am about to install a vent to the outside for the range hood exhaust in the kitchen. In the same bulkhead that will have this vent, there is some electrical wire (some 12/2 NM and some low voltage ...
5
votes
2answers
21k views

How can I prevent the clanging of my extractor fan vent cover?

I installed this exterior vent for our oven extractor fan However, the metal plate in the vents keeps swinging open and closed when it gets windy and we can hear it in the house to the point where ...
5
votes
6answers
15k views

How should I vent bathroom exhaust fans in an old brick house with slate roof?

I recently moved into an old brick house (slate roof), containing several bathrooms without vents. It's a problem that I've been wanting to correct, though I've put it off because I'm not sure if ...
5
votes
4answers
20k views

Is an exhaust fan over a gas range required?

Are we required to have one in a standard kitchen with a gas range in a residential home? The big question is not how many CFM or ducted or not, just whether there is a requirement in the building ...
5
votes
3answers
12k views

Installing bathroom exhaust fan: what to do with vapour barrier and insulation?

I'm adding a bathroom exhaust fan, which is being mounted in the ceiling of the bathroom (in the attic) and venting out through a vent in the wall. right now, there is a vapour barrier (paper) ...
4
votes
3answers
1k views

Why does my dryer duct have such a long vertical portion?

My dryer duct follows this path: Flex duct leaving the dryer Four feet of vertical rigid steel duct down into crawlspace Eight feet of horizontal rigid steel duct, immediately below the floor Outlet ...
4
votes
3answers
24k views

Range vent hood pipe

What type of pipe is best for venting my stove hood? Does flexy hose work or should it be hard pipe only?
4
votes
2answers
1k views

Dryer exhaust from 2nd floor through crawl space, out roof

This is my setup, 1986 built town home. I just purchased a dryer and before connecting it, I decided to inspect the 4" tube going from the dryer, up behind the wall to the crawl space / attic and out ...
4
votes
2answers
24k views

In what year did venting bathroom exhaust out of the house become a code requirement?

what was the year for code for vented bathroom exhaust fan? What is the code for vented bathroom exhaust fan?
4
votes
1answer
673 views

What type of island hood do I need?

I have a 30 inch induction cooktop and a 15*20 inch electric grill on a peninsula. The peninsula separates the kitchen from the family room - no wall on that side. We use the grill a lot for chicken, ...
3
votes
2answers
14k views

What can be done about this unattractive dryer vent?

The house I bought has dryer vent that runs from the dryer into the ceiling. Besides being an eyesore it is also loose/flimsy. I'm redoing the laundry room and would like to make this more ...
3
votes
3answers
2k views

Can I blow dryer exhaust into a pillow case or sheet?

Go ahead and laugh. It's okay. Before you do, though, hear me out. My dryer has been drying less and less lately. Today, it stopped drying. Now I have a full load of wet laundry and it's all the ...
3
votes
1answer
2k views

How do I prevent my stove hood from sucking heat out of my kitchen?

The hood over my stove is sucking the heat out of my kitchen. Is there a cover I can put on and take off to stop this loss of heat?
3
votes
1answer
485 views

How should I attach laminate foil dryer transition duct?

I've got a laminate foil dryer duct coming up from the crawlspace. I need to attach my dryer transition duct to the exhaust duct, but these really don't like to go inside one another since they're ...
3
votes
1answer
24k views

Can a range hood vent have a 90 degree bend and vent out the wall?

I know I need to check my local codes before proceeding with this. that will be done but I first wanted to ask this community for advice. i'm going to have my kitchen gutted to the studs in a couple ...
3
votes
1answer
3k views

How can I reduce whistling due to wind across a gas fireplace vent?

We have a gas fireplace venting through the roof of our attic bedroom; there's a cap on a chimney up there. Double-wall construction, such that it pulls combustion air in from outside. When the wind ...
3
votes
3answers
151 views

Can non-metallic cable go up a wall shaft for a furnace vent?

Pictured is the exhaust for a gas furnace, using a 3x12 double-wall insulated stovepipe. It is running up a non-load-bearing 2x4 wall sheathed in drywall. Which is apparently legal as far as ...
3
votes
1answer
3k views

How can I prevent water from entering through water heater/furnace exhaust vent?

I have an exhaust vent in my basement (Amerivent Type B) which takes the exhaust from my gas furnace and water heater goes out the basement wall, and up my chimney. A little bit water is coming in to ...
3
votes
2answers
838 views

Should I vent 2nd floor bathroom exhaust down?

I am looking to install an exhaust fan in a bathroom where one does not already exist. I've read that it is preferable to run exhaust ducts down instead of up, but does that apply here? We would be ...
3
votes
1answer
1k views

Why does the exhaust in my basement bathroom drip condensation in warm weather?

The exhaust in my basement bathroom drips condensation in warm weather, and the drop ceiling tile gets mildewed. I did not use insulated ducting to the outside. Should I wrap insulation around it ...
3
votes
1answer
3k 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. ...
3
votes
1answer
523 views

How do I calculate the proper fan size for a bathroom exhaust and the number of pickups?

Getting ready to remodel my bathroom and I'm thinking about installing an inline fan to reduce noise. I'm looking at Panasonic 120 and 240cfm models. Bathroom is 7' x 8' x 8'. With a shower in one ...
2
votes
5answers
64k views

How to make a 6 inch hole through a brick wall for venting

I'd like to vent my range hood out through an exterior brick wall. How would I go about making a 6 inch hole for the vent? I'd guess I'd use a masonry chisel to chip out the mortar and then pull out ...
2
votes
3answers
8k views

Should I install an exhaust fan in a new garage?

I'm having a new garage built in my home and I'm wondering if it's a good idea to have some sort of ventilation/exhaust/fan system installed while they're at it? I'm thinking of doing some spray ...
2
votes
3answers
27k views

Two dryers connected to the same exhaust via a “Y”. Backdraft problems?

I have two dryers (one gas, one electric) and their exhaust pipes are merged with a "Y" to a common exterior exhaust. I'd like to keep it that way to minimize cuts through the wall (and eventually I ...
2
votes
1answer
598 views

Is a dryer vent tube being compressed like this up to code?

There's a 4" dryer pipe in my wall that is smashed slightly in order to get it to fit into the wall made with 2v4s. Is this OK?
2
votes
2answers
11k views

Can I vent my dryer 'up'?

We recently moved our dryer into the garage stacked on top of a washer. The easiest way to vent it was straight up about 6' into the attic, then a right turn in the attic 12' out the back of the house....
2
votes
1answer
7k views

Why does my bathroom exhaust fan drip during the summer?

I've seen a lot of questions (including one on this site) about condensation on bathroom vents. However, they all seem to take place in winter, with consensus being that as the warm air from the ...
2
votes
2answers
5k views

Bathroom vent pipe going down instead of up? Is it OK?

I'm considering connecting the vents of two bathrooms to the same inline fan. See my previous question on inline bathroom fans. Does the fan and the exterior vent grille really need to be above the ...
2
votes
2answers
3k views

Wall stud in the way of vent hood exhaust

So I am in the midst of hanging a new vent hood in my kitchen and as luck would have it there is a stud nearly centered on where the vent hood exhaust needs to be. Looking for advice on the best way ...
2
votes
1answer
221 views

Did I install this roof vent correctly?

I’m installing a roof vent to exhaust a new kitchen cooktop. I put a 6” hole in my roof and fit this painted metal vent between the asphalt shingles. I have sealed around the roof penetration l, under ...
2
votes
1answer
836 views

What type of furnace vent pipe is this?

I need to extend my furnace vent pipe up 2 foot above the ridge of my roof to comply with IBC. So I need to couple this pipe somehow and extend it up. Any idea what type of pipe this is and how I ...
2
votes
2answers
2k views

Can I vent a basement bathroom into a semi-enclosed crawlspace under an attachment?

I'm refinishing my basement bathroom and installing a vent. I can easily vent out to this wall, but the thing I'm worried about is it's semi-enclosed. In the winter we put up tarps and store wood here,...
2
votes
2answers
62 views

Does an 8“ round to 10x3.25” elbow exist?

I have open space above cabinets and wife does not want a chimney on our range hood. SO I am looking for an elbow that will take the 8" round vertical exhaust and go 90 degrees into a 10x3.25" (we ...
2
votes
2answers
149 views

What is the proper way to connect a 4“ dryer exhaust to a 6” PVC wall exhaust?

Our dryer exhausts through a 4" opening, but the wall exhaust we will connect to is 6". The previous owners left an elbow / reducer, but it's beat up and basically falls out of the 6" PVC exhaust. ...
2
votes
1answer
8k views

What should I do about a hole in my dryer hose?

My cats tore a hole in our electric dryer vent hose, and I used the dryer to dry-clean a sweater using one of those sheets that you put in the dryer. Now I'm really worried about the fumes in the ...
2
votes
3answers
84 views

Shower in one bathroom causing moisture in the second

We have two bathrooms side by side on our second floor. They both have the same exact layout (about 6'x7'). Both have their own separate exhaust fans (Nutone, 80CFM, 1.6amps), but share the same vent ...
2
votes
1answer
3k views

Disable the timer on an exhaust ventilator

I have a bathroom exhaust ventilator installed that turns on when I flip the wall switch and that continues working on a timer when I cut the power in the switch. In terms of wiring, I see 3 cables ...
2
votes
1answer
2k views

Covering roof vents to keep out roof rats

I have around 20 vents on my roof and I currently do not have a roof rat problem but I want to cover them with something to prevent roof rats getting into the attic. I'm sure I can find something at ...