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Questions tagged [ducts]

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32 votes
6 answers
11k views

How do I fix this 30 ft (9 m) dryer vent abomination?

The previous owner left a bit of a headache with the dryer venting setup. Context: This is a gas dryer The living room is behind the right hand side wall, so that's a no-go as far as drilling The ...
Albert's user avatar
  • 331
24 votes
4 answers
10k views

Do Americans in dense city centers vent their dryers directly outdoors?

I live in California in a normal single family home. My normal US dryer vents out the back into a duct that eventually goes out the side of my house - it vents moisture, air and lint directly to the ...
user227963's user avatar
  • 1,078
23 votes
5 answers
18k views

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 ...
user2503795's user avatar
17 votes
6 answers
911 views

Is it worthwhile to have ductwork cleaned?

Was rearranging some ductwork in my basement, and noticed that the stuff I took down was pretty filthy inside (especially the return air ducts). Is it worthwhile to have ductwork cleaned out? What ...
Eric Petroelje's user avatar
14 votes
2 answers
128k views

What type of tape do I use on a dryer vent?

I need to install a dryer periscope vent in my new dryer unit, However, it needs to be sealed for leaks. What type of tape should be used to tape a periscope dryer vent?
Rick's user avatar
  • 141
12 votes
2 answers
6k views

How can I transition a square duct to round of the same outer size?

In remodeling my bathroom I had to convert a 6"x6" square duct underneath the floor joists in the basement to flex so I can get around my new toiler drain. I cannot for the life of me find a 6"x6" ...
underthetablethinker's user avatar
12 votes
2 answers
141k views

What does a Summer/Winter switch on furnace air ducts do?

On some of our furnace ducts, there is a switch/valve for Summer/Winter or S/W. What does changing this switch/lever accomplish? Can bad things happen if I forget to switch it? Bonus question: ...
The Other Steven's user avatar
11 votes
2 answers
8k views

What is this device I found in my HVAC duct?

I was looking through my HVAC ducts with a camera and found this device attached to the side of a floor joist. It is about 2-3 feet from the air return vent. What is it?
Programmer's user avatar
  • 2,050
9 votes
3 answers
37k views

Is there a trick to getting round HVAC duct pieces to fit together

I have been doing some basic HVAC duct work as part of a remodeling project and I can never get the pieces to fit together without massive amounts of elbow grease and mangling the ends. Is there some ...
Shane Wealti's user avatar
9 votes
4 answers
26k views

How can I figure out why half my house is cold?

I just purchased my home a few months ago, and the AC was sub par during the summer. Now that winter is here, the house is extremely uncomfortable (cold). My furnace shoots hot air up to one main ...
Benny's user avatar
  • 297
8 votes
5 answers
20k views

How can I stop our duct work "pinging" at night?

I'm in Canada, and our home is a bit older, ~20 years, and the duct work seems to be making a rather loud "pinging" noise at night. I assume this is due to colder weather in general, and the hot air ...
Ditto's user avatar
  • 254
8 votes
2 answers
111k views

Is 20 feet too long to run bathroom fan duct for 100cfm fan?

I need to run about 20 feet of duct to reach the gable, I don't want to go through the roof unless I absolutely need to, I live in Vermont and we can get a lot of snow build up on the roof, I also ...
user602525's user avatar
8 votes
2 answers
8k views

Do joints in adjustable duct elbows need to be taped?

Do the joints in adjustable duct elbows need to be taped as well once they're adjusted or are they considered air-tight?
Brad Mace's user avatar
  • 2,495
8 votes
2 answers
14k views

How do I install a jump duct?

Our master bedroom is considerably warmer than the living/dining/kitchen area of our house, and we've been setting the thermostat quite lower than we'd like in order for the bedroom to get cool enough ...
Michael Moussa's user avatar
8 votes
1 answer
938 views

How should I install a signal cable duct from new home office to a wiring closet?

I'm constructing a new home office and rather than having fixed cables from the (existing) wiring closet, I want to have the flexibility to add/remove/change cables in future, so I've been looking at ...
tomfanning's user avatar
7 votes
4 answers
2k views

How can I plug screw holes in an insulated supply duct?

My contractor left two screw holes in one of my insulated supply duct lines (because they had added a strap to hang new ductwork on, but they changed their mind and moved it). What's the best/easiest ...
MonkeyBonkey's user avatar
  • 1,209
7 votes
1 answer
2k views

What do to with this vent?

I was in the shower yesterday and said "Oh no, a loose tile!". 5 hours after the shower, I'm here, as the tile was not just "loose" but water had gotten all into the wall and was ...
LarryBud's user avatar
  • 789
7 votes
2 answers
6k views

How can I offset 6" ducting by just a few inches?

I am installing a range hood and due to a ceiling joist in the way, I have to offset the ducting going through the ceiling by about 3" from the center of the hood. I have to do this within about ...
Chad's user avatar
  • 255
7 votes
5 answers
94k views

Why am I finding condensation in my dryer?

I live in Houston, TX (Very Hot, Very Humid). In the summertime, my dryer is dripping with water, when not in use. I do not have overly excessive drying times. My dryer is vented via an unfortunate ...
Steve Jackson's user avatar
7 votes
2 answers
315 views

Is Complete Ductwork Required to Start the Condensor?

I'm in the middle of rebuilding my entire AC system. I've got one 14" return and two 8" supplies hooked up to the blower (on a 2 ton system). I plan to add much more, but for now I want to ...
Tyler M's user avatar
  • 1,070
7 votes
1 answer
525 views

Do I need a wall thimble for thermal separation with a category III venting appliance?

I bought a tankless water heater that allows me to vent using category III. I've seen that wall thimbles are included in many category III termination kits, but am wondering if they are really ...
virtualxtc's user avatar
  • 2,597
7 votes
4 answers
6k views

How can I be sure all the asbestos particles are gone?

So we got rid of the popcorn ceiling that had asbestos. Now my wife is worried about the particles that might still be lingering in the air. How long until it settles down? Wet-mopping, HEPA vacuuming ...
Tomas Garcia's user avatar
6 votes
3 answers
2k views

What sort of contractor retrofits kitchen exhaust ducts in the US?

I am new to the US and my wife and I are currently thinking about remodeling the 35-ish year old kitchen of the small house we purchased. Part of that remodel is replacing, if possible, the existing ...
user avatar
6 votes
1 answer
4k views

Insulating ducts in a crawlspace

Consider a source duct from the furnace/AC. The ducts run in a vented crawlspace. The floors atop the crawlspace are a mix of hardwood and kitchen vinyl. The symptoms are: the longer run vents aren'...
p.campbell's user avatar
5 votes
2 answers
2k views

My new AC is under performing and guzzling too much juice, can anyone help?

My company mainly focuses on small refrigeration units and walk-ins. Although we do offer service and/or Replacements on air conditioning systems, it’s only 1/3rd of the whole show so, I’d be a liar ...
www.TEGdelivers.com's user avatar
5 votes
2 answers
4k views

How to make attic easier to traverse?

My attic is a maze of wires, air ducts and PVC water pipes. I went just one room over from the attic entrance and it took me a solid 30 minutes just to go there and back. Would it be unreasonable to ...
HenryM's user avatar
  • 191
5 votes
6 answers
30k views

How do I cut Semi-Rigid Aluminium Ducting?

I wish to cut the duct work without damaging my hands or my wife's kitchen scissors. So what tool should I be using? (Trying to get the ends squared using a freehand hacksaw does not look easy.)
Walker's user avatar
  • 6,239
5 votes
2 answers
19k views

Broken dryer duct

I noticed it was very humid in my laundry room. Mostly worried about ruining my wife's $400 duvet (don't get me started) I turned off the dryer. I noticed there was also a fair amount of lint kind of ...
corsiKa's user avatar
  • 231
5 votes
2 answers
3k views

What's the minimum clearance from drywall when installing rigid duct work?

What's the minimum clearance required when installing rigid duct work on vertical walls with drywall and 2x2 framing. If I don't install drywall behind the rigid duct work for which there's only 1/2&...
Jeff84634's user avatar
5 votes
2 answers
611 views

Spending $$$ on energy efficiency heatpump attached to old ductwork? Smart? [closed]

My 20 year old heat pump gave up the ghost. With summer here, I need something soon. I've had companies give me bids over the weekend, both with great reviews on yelp and Google. Guy #1 was selling me ...
UncleChef's user avatar
5 votes
1 answer
1k views

Can I place ventilation ducting on top of joists if there is space?

I'm installing a ceiling-mounted extractor fan above a kitchen island. The problem is with the placement of ventilation ducting in the ceiling: the joists are running in the opposite direction to the ...
jlo's user avatar
  • 53
5 votes
2 answers
19k views

Why is there a vent on the ductwork coming right from the furnace?

Why is there a vent on the ductwork coming right from the furnace? I have a typical furnace for a 1400sqft house in Michigan. I also have central air which runs through the same duct work. There is a ...
Christopher's user avatar
5 votes
1 answer
4k views

Dryer Venting Woes - what to do?

I can certainly collect some pictures for this but I'm hoping on sound engineering & design principles I'll get a recommendation worthy of executing to that meets code. I have a vented clothes ...
noybman's user avatar
  • 2,025
5 votes
3 answers
6k views

Should I insulate metal duct work in basement?

I have a balloon frame house with an unfinished basement. The air handler and furnace are in the basement too. Last fall, we had the duct work removed because it was wrapped in asbestos tape that ...
nexus_2006's user avatar
4 votes
2 answers
2k views

Can the exhaust duct of an ERV vent *into* the garage?

I am looking to install an ERV in my house and am currently trying to determine good locations for the intake and exhaust vents. While I have identified other candidate locations for the exhaust vent, ...
Andy Hall's user avatar
  • 237
4 votes
3 answers
2k 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 ...
ArgentoSapiens's user avatar
4 votes
4 answers
15k views

Is a lip necessary on an HVAC ceiling register boot for use with flexible ducting?

I've installed some new ceiling register boots to use with flexible ducting and realized after install that they have a smooth connection with no lip. I'm assuming they are made for metal ducting, as ...
ThinkingStiff's user avatar
4 votes
5 answers
98k 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 ...
jlpp's user avatar
  • 1,974
4 votes
2 answers
34k views

How can I quiet a bathroom exhaust fan that became loud only after the duct was added?

I had a fan added in my bathroom. Surprisingly there wasn't one at all. When the fan was first installed they had it venting into the ceiling. It was a .5 sone fan and you could hardly tell that it ...
JoshFink's user avatar
4 votes
1 answer
3k views

Venting Range Hood into Attic Space, Temporarily

My ductless recirculating range hood broke, and I have to install the replacement. I love to cook, so I'm installing a roof vent for a ducted hood. The range hood I bought has good filtering for ...
user3532846's user avatar
4 votes
1 answer
10k views

Dryer vent passing through two wooden beams. Is it safe?

I have a dryer vent that exits the house wall through two wooden beams. The vent is built using two corner rigid pieces and one long rigid aluminum piece. The long rigid piece is the one that passes ...
Michael's user avatar
  • 503
4 votes
2 answers
1k views

How should I connect misaligned round ducts inside a cabinet?

New cabinets, new over-the-range microwave, old 7" duct from the previous range hood — but the microwave exhaust adapter doesn't quite line up with the duct, and the distance is pretty short: ...
BHSPitMonkey's user avatar
4 votes
1 answer
18k views

How can I reduce noise from tenants coming through my heating duct?

I live in an old house with a wood frame and forced air heating. My family lives upstairs and we rent out the bottom floor. My problem is that the sound from my tenant's bedroom travels directly into ...
Andrew Eisenberg's user avatar
4 votes
2 answers
29k views

Should my furnace closet have this huge duct opening into the unconditioned vented attic?

So my interior furnace closet has a huge duct in it that connects the closet to the unconditioned vented attic right above it. Needless to say, this is a huge air leak into the conditioned part of the ...
iLikeDirt's user avatar
  • 12.6k
4 votes
2 answers
236 views

Solution for fiberglass ducts that have collapsed in basement?

I have two furnaces in my house, one for the basement and one for the rest of the house. I noticed that while using the basement furnace this winter that no air was coming out of any of the basement ...
deadflowers's user avatar
4 votes
3 answers
3k views

How To Optimize This Bathroom Fan Duct?

I recently installed a new bathroom exhaust fan, replacing a loud and underpowered one with a quieter and more powerful (110cfm) fan. Because of the existing framing and roof vent location, I was ...
Palin567's user avatar
  • 107
4 votes
2 answers
12k views

Insulate rigid rectangular duct

The problem My vented attic in Virginia has a straight 28ft of 12" x 8" rigid rectangular trunk duct with seven 6" branches. The insulation is quite low around R-4, and also has many tears and rips, ...
joshdoe's user avatar
  • 319
4 votes
2 answers
5k views

How do I improve heating in back room of house?

The back room of my house is quite warm in the summer. The room is on the north side of the house (Alabama, USA), so the outside walls don't get direct sun exposure. The attic insulation is a little ...
Les Bartel's user avatar
4 votes
1 answer
147 views

Can someone identify this HVAC duct component?

Getting ready to redo duct insulation. On supply ducts off the trunk there are some sort of valve-like devices teed into the duct and oriented to point down. Same diameter as the duct. Butterfly ...
w_mark_c's user avatar
4 votes
1 answer
3k views

How do I replace an A/C diffuser attached to flex duct?

Our house has central air, with the air distributed via flex ducts around the house. On the second floor, the diffusers have baffles behind them that can be closed when the system is not in use, but ...
larsks's user avatar
  • 232

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