Questions tagged [exhaust-vent]

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3answers
74 views

What type of duct should I use for a clothes dryer exhaust?

I am planning to relocate my gas dryer to the center of my basement. The closest vent is in one of the walls 16ft/5m away. To reach it I would need to run an exhaust pipe horizontally, enclosed in the ...
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3answers
43 views

Replacing Bathroom Vent Fan

Looking to replace a bathroom vent fan in a property that is being renovated. The exhaust fan was not working, upon further inspection it seems to be the motor that is causing the issue. I want to ...
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1answer
52 views

Multiple concentric vent kits

I have two concentric vent kits I need to poke through the roof. One is for my furnace and the other for my tankless water heater. I want to place them near each other for aesthetic reasons, but I ...
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2answers
35 views

Close old OTR hood vent hole on exterior stucco wall

How do I permanently close and seal the old vent hole on the outside stucco wall ? Do I have to remove the old metal vent (see photo) or can I just put stucco patch on top of the metal and fill in ...
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1answer
20 views

Venting for a single exhaust Portable AC

Ever since I got my Portable AC, I've been wondering how I can make this chunk of junk more efficient because till this day, I have never been able to drop the temperature lower than 25 degrees ...
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1answer
43 views

Do these look like good PVC exhaust and intake termination ends for a new tankless gas heater?

I just had a new tankless gas water heater installed, and it seems to be working well. But looking around here, other sites, and my own HVAC system, the terminating ends seem to come out further from ...
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0answers
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Safe to install humidifier above furnace gas vent?

I'd like to add an AprilAire 600 bypass humidifier. I plan to install the humidifier on the supply plenum, and the bypass duct on the return air. The gas vent coming off the furnace is type B. ...
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0answers
14 views

Fixing sub-optimal Tempstar furnace vent installation but can't find part numbers

I have a Tempstar N9MSE0601714A furnace with 2" PCV vent pipes (that mate to 2.5" pipes). Whoever installed it didn't fallow the installation manual and I'm also reducing the number of ...
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3answers
87 views

How to properly permanently seal a duct opening?

I recently hired a handyman to install an over the range hood. To install it, he cut a hole in the bottom of the upper cabinets and routed the duct through the back of the cabinet's, into a vertical ...
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2answers
42 views

Does the combustion air inlet for a 95% HE furnace need to be sloped down the same degree as the exhaust?

I'm determining if existing 2.5" PVC furnace vent pipes can be moved inside an existing soffit box in my garage ceiling. To do this the exhaust outlet pipe could keep it's existing grade from ...
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2answers
187 views

How can I join an exhaust vent and an existing duct that aren't aligned?

I'm replacing the over the range microwave in my house, and the new microwave's exhaust vent does not align with the existing ductwork and hole in the wall for the exhaust - neither vertically nor ...
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1answer
75 views

Will condensation form and be an issue on an aluminium duct venting water heater exhaust?

I have built the unfinished chimney shown in the image below to get the exhaust for my neighbor's water heaters (which I believe are sealed combustion gas appliances, such as the Remeha Avanta water ...
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0answers
32 views

How to safely bring a water heater exhaust above the roof line

Background A 5 story house in Rotterdam, the Netherlands, constructed in 1905 is divided into 4 units and each unit has its own gas water heater. The exhausts for these water heaters are aluminum ...
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0answers
62 views

Replacing abnormal outdoor dryer vent

The louvers on my original (20 year old) outdoor dryer vent have practically seized up and I'm in need of a replacement. When I take to places like Lowes or Amazon, I only find the style which ...
4
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1answer
55 views

What is the correct placement of a 2nd story through-wall bathroom vent

I have a 2nd story bathroom which is a little too humid unless the window is left cracked all the time, greatly decreasing the efficiency of our HVAC system. I would like to install a bathroom fan ...
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0answers
45 views

Is there such thing as secondary lint traps for rectangular dryer ducts? [closed]

I have been searching online for a couple weeks now without any luck. There are plenty of secondary lint traps that install along a run of standard 4” rigid metal duct. I’m looking for a secondary ...
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1answer
46 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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4answers
2k views

How to seal dryer exhaust vent

I am replacing my dryer exhaust vent. Here is a picture of the old one after I removed the cap. I did my best to clean up the old caulking before adding the new tube and vent, which looks like this: ...
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0answers
45 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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0answers
123 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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2answers
3k 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
4k 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
370 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
105 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
74 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
101 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
44 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
8k 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
30 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
102 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
355 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
106 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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2answers
112 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
1k 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
707 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
622 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
905 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
53 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
50 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
756 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
2k 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
47 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
104 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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1answer
306 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
602 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
133 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
281 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
351 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
7k 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
513 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 ...