Questions tagged [exhaust-vent]

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Can I vent my gas dryer through my gas water heater closet to the outside?

I have a gas dryer that has the vent duct going into the gas water heater closet to the outside. Is this safe ?
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2 answers
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Help Identifying Vent Purpose

I'm trying to figure out what a vent on my roof is for. I have two vents close together. #2 in the photo is for the venting of the hot water heater. #1 is the one I'm not sure about. It has an ...
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2 answers
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Is the outside vent opening the same on most over the range microwave ovens?

Our 2010 over the range microwave oven is about it die. It wents outside through an opening in the wall behind the microwave. There's a port opening when the fan starts and it blows out through there. ...
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How to re-route range hood ducting to my vent?

My current range vent does a wonky turn around and prevents the cabinet door from closing fully. I'm trying to figure out an alternate way to make the connection, but don't really have any good ideas. ...
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Sealing air gaps around edges of attic gable fan

I just installed a new gable fan to exhaust hot air from my attic. Due to unevenness in my studs and gravity pulling one side of the fan lower than the other, there are small gaps (ranging between 1/8&...
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9 votes
2 answers
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Using old vent pipe as TV antenna

I recently replaced a house trap, and as a result, I have a leftover vent pipe that runs from my basement up through my roof. Would it be possible for me to somehow connect a coax cable to the pipe so ...
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Will this roof vent installation cause me problems?

I just have my house re-roofed on last November. Recently I look around in the attic and found the new vents and ventilation fan weren't prefect fit the existing holes. Will this situation be a big ...
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Outdoor direct vent tankless water heater (low nox) on exterior wall under overhang?

I have an exterior tankless heater that is one of the high-efficiency/low nox type, it has a direct vent (pretty small, actually) just sitting on the top grill. This is mounted outdoors, but is it ...
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Is there a minimum distance between two exhaust vents going out an exterior wall? (NJ state)

Is there a minimum distance between two exhaust vents going out an exterior wall? I'm in the state of New Jersey and I was unable to find anything related to minimum distance between two exhaust vents ...
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2 votes
1 answer
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Best position for kitchen exhaust duct flow sensor

*TL;DR: a flow sensor on a kitchen exhaust duct fails to work reliably in its current location. Will moving it down two floors closer to the upstream exhaust hoods help or be a waste of effort? We ...
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3 answers
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Are exhaust fans inter-connected in a 3 stories condo?

I am a smoker who lives on the first floor of a 100 years old 3 stories condo. During the winter, I smoke in my bathroom with the exhaust fan (on the ceiling) turned on to draw the smoke out. Each of ...
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how to eliminate fabric softener or anti-static chemical odors from laundry room

I recently purchased a 1960s home built on a crawlspace and have found that the laundry room and adjacent hallway has a strong odor of fabric softener and/or ant-static dryer sheets. When I walked ...
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2 answers
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Is water in a bathroom vent pipe avoidable?

My bathroom's fan vents through the ceiling, with a unit like this one: https://www.homedepot.com/p/Broan-NuTone-3-in-to-4-in-Roof-Vent-Kit-for-Round-Duct-Steel-in-Black-RVK1A/100344509 We had some ...
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2 answers
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Vent 80% gas water heater through rim joist?

Can an 80% efficiency, draft hood, 40k BTU, water heater be vented through a 2x10 wood rim joist with painted cedar siding? Assume proper pipe sloping. The termination would be roughly 2 feet above ...
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2 answers
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Is it safe to use Category 1 80,000BTU furnace with 2 inch PVC exhaust?

A contractor just finished installation of new HVAC system with a category 1 furnace (model: GMES800805CNAA). He originally used a reducer to connect 4 inch exhaust to a 2 inch PVC pipe. He claimed ...
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3 answers
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Do you to block a unwanted 4 inch hole or reuse it for something else?

Have 4 inch hole was made by builder for no reason and went unnoticed for long time as the hole was in the side wall of the House. the hole is through a basement wall. How can I permanently block the ...
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Insulation around the pipe outside of a kitchen exhaust

Context I have a kitchen exhaust which works well enough, this question is about insulation. Last winter was quite a cold one for where I live, and I felt a nice fall of cold air coming from there. I ...
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How can I install a hood exaust vent with a joist in the way?

I was preparing to install a hood vent this weekend and found myself with a bit of an issue... Here's what it looks like: The larger hole in the middle is the center point over my cooktop and the red ...
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Rigid or Flexible bathroom exhaust duct

In my 2nd floor condominium, I need to replace bathroom ceiling and exhaust fan. Old ceiling has been removed. My contractor is going to install new ceiling. I want to replace old exhaust fan and duct ...
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0 votes
3 answers
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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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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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4 votes
1 answer
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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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1 vote
2 answers
241 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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1 answer
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How do I provide proper venting for a single exhaust portable AC unit?

Ever since I got my portable AC, I've been wondering how I can make this hunk of junk more efficient because till this day, I have never been able to drop the temperature lower than 25° C. This week I ...
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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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2 votes
0 answers
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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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1 vote
0 answers
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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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-1 votes
3 answers
367 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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2 votes
2 answers
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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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2 answers
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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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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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3 votes
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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 ...
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4 votes
1 answer
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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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3 votes
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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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1 answer
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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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4 answers
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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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2 votes
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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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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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0 votes
2 answers
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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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12 votes
3 answers
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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0 votes
1 answer
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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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1 vote
2 answers
310 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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1 vote
1 answer
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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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1 vote
1 answer
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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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1 answer
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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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37 votes
3 answers
12k 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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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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2 votes
2 answers
166 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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1 answer
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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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1 vote
1 answer
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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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