Questions tagged [exhaust-vent]

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49 views

Can a convection oven be used without exterior venting?

My home is 20 years old. I have a free standing stove/oven and a microwave above installed when home was new. Neither is vented and the roof is tile and exterior is stucco so I won’t be able to vent. ...
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3answers
3k views

Gas clothes dryer is venting into the crawl space

I have been living in a house in Southern California for 18 months and while crawling around under the far end of the house I found that there is about 2 inch deep lint over a 200 sq ft area where my ...
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1answer
22 views

Can I have a shared exhaust flue for a high efficiency furnace and tankless water heater?

I recently purchased and am installing a 96% efficiency two-stage gas furnace. The old unit was an 80% efficiency unit using a 4" metal flue. This flue merges the exhaust of both the hot water heater ...
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2answers
29 views

Water Heater Exhaust - how to connect the 3 inch hood to four inch exhaust pipe

I'm working on this gas water heater with 3" hood almost attached to an elbow that reduces from a 4" exhaust flue. This was only attached by a lot of aluminum tape. The problem is that the ends of ...
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1answer
31 views

What kind of vent material can be used for gas dryer?

Dryer at present butts up to vent sticking into the room. This works just fine. I want to put the dryer and washer on a plinth to make it easier to access. I don't want to put the dryer further ...
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1answer
74 views

How to terminate cooker hood ducting

I have a probably stupid question about assembling ventilation pipe for a cooker hood. I want to vent my cooker hood through the eaves rather than go through the roof as I suspect it's cheaper, less ...
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1answer
36 views

Furnace heat duct for basement

I'm trying to install a heat exhaust vent on the side of the drywall in the basement, see pic. The issue is that the the register is too small for the boot. This is normal if the exhaust is in the ...
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3answers
6k 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 ...
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1answer
27 views

Bedroom Install of a Takagi T-H3-DV-P - 199,000 BTU Propane Indoor Condensing Ultra-Low NOx

I'm in the process of a remodel, though I need to do it in phases. third or 4th phase down the road is to use part of the Master bedroom and make a Laundry room with some of the space. Though I ...
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2answers
74 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 ...
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1answer
121 views

How to retrofit existing kitchen exhaust fan

I'm remodeling a kitchen that is circa 1940's. In the kitchen is an exhaust fan that sits inside a 3.25x10 duct. I would like to keep an exhaust fan in this location and re-use the existing duct, ...
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1answer
58 views

How to re-purpose an exhaust fan using a 10x3.25 duct?

I'm currently remodeling my kitchen. Instead of a cooktop hood, I plan to re-use the existing ceiling exhaust fan. It looks to be about a 8" diameter fan that is inside a 10x3.25 duct that exhausts ...
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0answers
56 views

HVAC Exhaust Routing Question

Just wondering if I could get some advice on the optimal way to route the HVAC Exhaust piping. Enbridge replaced the supports underground and before they turned the gas back on they did an inspection ...
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0answers
37 views

can I vent a bathroom vent through an existing gooseneck?

Can I vent a bathroom vent through an existing gooseneck attic vent? I already have another gooseneck and two gables along with soft vents.
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2answers
68 views

Can a Dryer with a 4“ exhaust safely vent through a 3” pipe?

During some home-improvement, we need put in some new dryer venting. The most aesthetically pleasing option is to have a 90deg turn out of the dryer, then into a 3" pipe that goes for 9 feet. There is ...
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2answers
232 views

Using existing exhaust stack for new furnace

I'm about to replace the furnace in our house. The existing furnace uses a 6" stack through the roof. I know most new furnace installations just use PVC and poke out of the wall at about ground level. ...
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2answers
231 views

Outside dryer vent clogs with lint

A few days ago our dryer started complaining about a blocked airway, so I went up on the roof to check out the vent and sure enough the screen was completely clogged with lint. It's a new vent that ...
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0answers
293 views

Best way to shield microwave and cabinets from stovetop steam

We recently installed new cabinets in our kitchen and we also had our microwave vented to the outside. From this two problems have arisen. the Samsung microwave now sporadically gives a C-F0 error....
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3answers
292 views

Does using an existing attic exhaust pipe to also serve air flow from a range hood cause smells/micro particles of oil/soot/etc to get into attic?

Our kitchen renovation contractor decided to change plans on us and vent the range hood out via the same pipe as was pre-existing to passively control the temperature in our attic, instead of vent out ...
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0answers
43 views

Concerns with installing 4“ Dryer Booster Fan into 7” duct

Our new-to-us home was built in 1850, so there's been a lot of oddball things done to it's guts over time. One of these is the dryer vent duct work that looks to have been installed sometime in the ...
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0answers
43 views

unique ? about venting tankless water header

I am installing a tankless water heater at the house. My question is unique because I can not find a reference anywhere in the code and the installation manual about where to place my exhaust vent. I ...
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1answer
548 views

Do we need a gable vent, and in either case, how to vent bathroom fan outside (can it be via the gable)?

We need to put a hole from our attic to the outside, one way or the other. Before making any holes, I hope to hash out the details. Here's the goals: Make sure attic is properly vented Direct ...
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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 ...
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0answers
39 views

Do I need to replace the water heater vent pipes if they have salt corrosion?

I was in my attic improving the insulation and I found that my exhaust pipe for the water heater has salt/corrosion all around the seams. Based on what I found, this is either caused by inadequate ...
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0answers
80 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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0answers
179 views

Furnace draft inducer switch tripping

I have an older furnace and a brand new natural gas instant water heater that I installed. I only start this way because the furnace had one thing break last year, so I'm not sure if things on it are ...
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1answer
390 views

Downstairs exhaust fan venting into upstairs?

I recently purchased a bi-level home with two full baths. The inspection didn't include ductwork, but it seems to me that the downstairs bathroom is somehow venting into the rest of the house. There ...
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1answer
70 views

What is required clearance from mechanical exhaust to garage door?

I'm looking to add a new tankless water heater, which allows for pvc exhaust. In California, USA, I think clearance requirements for a door is four feet horizontally or one foot vertically. Does this ...
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1answer
188 views

furnace exhaust - move for renovation

We are in the US. We have a 95% efficient furnace that exhausts to the house in a straight line from the furnace to the wall. We are building an extension to the house and the exhaust will now be a ...
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1answer
181 views

How to modify and redirect the tankless water heater steam exhaust away from the house?

I am seeking help from this community to come up a creative solution on how to make a minor/elegant modification to direct the steam exhaust to go outside and away from the house. Right now, it will ...
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3answers
3k views

Connect 4“ Dryer Vent Duct to 4” Exhaust Pipe

I just had a new dryer installed. The installer said I needed to buy a pipe reducer because the dryer vent duct and the exhaust pipe are both 4". He cut some holes in the dryer vent duct to fan it ...
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1answer
421 views

Connecting dryer to dryer vent

In all the youtube videos I see, dryers are connected to dryer vents via flexible hose. One end is clamped to the dryer and the other is attached to a plug that fits into the vent I bought a vent kit ...
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3answers
772 views

Very low humidity levels in new construction home - over ventilation?

I just purchased a new home in the suburbs of Boston with move in date of November 2017. The home has felt unusually drafty and cold and i've had to increase the heat about 4 degrees above what I ...
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1answer
1k views

How best to secure rigid duct near a ceiling penetration

In order to vent a kitchen cooktop exhaust hood I am running rigid 6" round metal duct from my ceiling to a roof vent. The cooktop is on the front wall of my house. For aesthetic reasons I wish to ...
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1answer
330 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 ...
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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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2answers
1k views

Should I increase the duct size of my bathroom fan outlet?

I have a new bathroom fan that I'm installing that is 70 CFM. It will only be in the water closet part of the bathroom as the bathroom already has a larger 150 CFM fan in it. The 70 CFM fan has a 3 ...
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1answer
215 views

Direct stove/kitchen exhaust into kitchen sink drain

I live in an apartment that has terrible or zero ventilation for kitchen smells generated while cooking. The exhaust under the Microwave just removes oil from the fumes and circulates the air within ...
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2answers
4k 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 ...
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2answers
153 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. ...
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1answer
352 views

Is the hole cut in the wall for externally vented, over stove microwaves, standard?

I have a Goldstar MV-1515W microwave installed over the stove vented externally. I want to replace it. Goldstar became LG. I contacted LG and they were unable to tell me whether a new model will have ...
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3answers
178 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 ...
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2answers
234 views

Do I need to be concerned about moisture around dryer exhaust?

I have a dryer stacked on top of my washer and the exhaust duct attachment point is elevated off the ground. Or contractor had to build out the wall and create an area where the plumbing, gas and ...
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3answers
2k views

Additional exhaust vents needed for whole house fan

I need ~8-10 sq ft of additional exhaust vents to accommodate a new 7600 cfm whole house fan. Uncertain if add'l soffit vents needed for adequate ventilation flow through attic. Planning to install ...
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1answer
1k views

Wall Oven and Microwave Vent to Attic

I bought a house that has a microwave & wall oven combination. It's a Kenmore model from 2008. The microwave & wall oven combo vents through a metal pipe (about 4 inches) that runs through ...
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2answers
125 views

Extract air in bedroom with no other vent

I have purchased a MORI HR 150, which is an extractor vent. It has an "alternate flow" and "extract only" setting. I want to set it on extract only, which means it will take the air from inside and ...
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1answer
11k 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 ...
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0answers
160 views

Can inline range hood exhaust fan damper be safely/legally installed,1st floor of 2 story apt

I live in a 2 story apartment. Whenever the tenants directly upstairs turn on their range hood exhaust fan, I get whatever they are cooking/burning in my apartment. I have pulled down the range hood ...
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2answers
105 views

Natural Gas water heater safety designs

Do new gas water heaters have safety features that shut off the gas valve if they over heat? I have one that the pilot will be off and water all around the tank but we cannot find out where the water ...
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1answer
155 views

Adding exhaust fan to semi-rigid dryer duct

I recently moved into a new house purchased by my friend/roommate/landlord. I plan on setting up my electronics workshop in the basement laundry area this weekend. Although there is plenty of space, ...