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64 votes

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

You're missing the big picture here While your concern about lint causing pollution is at least reasonably admirable, the reason European dryers have all that filtering instead of a vent isn't for the ...
ThreePhaseEel's user avatar
57 votes
Accepted

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

Move It! As already noted by some others, moving the dryer to the wall where the vent ends is a great idea. The location for a gas dryer needs three things: Vent - Absolutely perfect. While you're at ...
manassehkatz-Moving 2 Codidact's user avatar
35 votes
Accepted

Bathroom exhaust fan without duct

Is this a big problem? I assume the fan has been like this for 15+ > years. If it is, I will look into getting a duct there, which is complicated by the inaccessible attic space. Moisture in the ...
Ack's user avatar
  • 5,729
23 votes

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

TLDR: Often not, due to costs or incentives. Lint is not a significant pollutant. The major reasons are: The high construction cost of building a dryer vent in every apartment. The enormous energy ...
Harper - Reinstate Monica's user avatar
23 votes
Accepted

What do to with this vent?

Look up. At various points in time it has been considered acceptable in various places to use a stud bay as a duct, without bothering to line it in metal, etc. So you may find a register above this ...
Ecnerwal's user avatar
  • 218k
22 votes

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

They do exist. Best bet is probably to contact a local sheet metal shop, if they don't have one they can build one. Expect this to cost in the tens of dollars range. You could potentially cap the end,...
gregmac's user avatar
  • 29.1k
21 votes

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

Electric. Heat pump based. Condensing. Dryer. Duct disposed off, vent sealed for good. Depending on where you are, it may be way cheaper (heat pumps are quite efficient) in terms of gas/electricity ...
fraxinus's user avatar
  • 3,149
19 votes
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How can I offset 6" ducting by just a few inches?

30 inches of height? 3 inches of offset? You need to learn how to use multi-section rigid duct elbows, which can be rotated to be considerably less than the 90 degrees you buy them at. You have plenty ...
Ecnerwal's user avatar
  • 218k
17 votes
Accepted

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

Poke the tip of a tube of silicone caulk in there and dab the hole, then patch the insulation with foil tape as you had done. Really, those holes are inconsequential. There are probably a hundred such ...
isherwood's user avatar
  • 139k
16 votes

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

I absolutely applaud your exploration of new HVAC tech. Right now, the industry (Carrier, Lennox etc.) are very much like the auto industry in 1980. They're still shoveling the same old products even ...
Harper - Reinstate Monica's user avatar
15 votes

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

Replace the unit I would replace the unit to a condenser type dryer. They produce water instead and require no vent. Some units put the water directly to the drain or you can use a tray you have to ...
Esben Skov Pedersen's user avatar
15 votes
Accepted

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

I am sure it would be against code. If it isn't always running and your ERV doesn't have a damper on the exhaust then you've introduced a nice path for CO to enter from your garage into your house. I'...
Fresh Codemonger's user avatar
14 votes
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How to make attic easier to traverse?

I live in Florida too so I know exactly what you mean about hot attics. I had the same problem except for the pvc water pipes. I put up a number of 2 by 8 feet of 3/4 inch plywood on the rafters. ...
JACK's user avatar
  • 81.7k
13 votes
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What is this device I found in my HVAC duct?

It’s some form of the DSC surface siren. It may have a built in siren driver or it may be “speaker only”. They are typically used with home alarm systems. These have been private labeled over time ...
Tyson's user avatar
  • 4,230
12 votes

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

I think you have already done enough with the Aluminum tape. That should keep the air from leaking out and that's what such tape is designed for. If the duct is covered with insulation, then you ...
jwh20's user avatar
  • 23.4k
9 votes
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Venting Range Hood into Attic Space, Temporarily

The biggest issue you have venting into the attic is warm, moist air being blown into a somewhat closed area (aside from the grease and particles you have a filter for). If the attic space you vent ...
JPhi1618's user avatar
  • 28k
9 votes

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

Unless your ERV also exchanges humidity, you are putting relatively humid air into the cool space of the garage. Even in my dry climate (Alberta, 16" of precip/year) the aphorism "rust ...
Sherwood Botsford's user avatar
8 votes

How can I reattach an HVAC duct that came loose below the floor?

The tiny screws have obviously failed so you'll need to re-fasten the flange to the subfloor. It looks like a 6 inch duct so if you can reach the duct with your hand then do this: Permanent fix Bring ...
MonkeyZeus's user avatar
  • 16.6k
8 votes
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How to fit portable air conditioner hoses through a too small wall vent

You could investigate the rectangular panel that holds the two holes in the wall. Perhaps it can be removed, then you can replace it with a new panel with a suitable hole cut out. You could search ...
jay613's user avatar
  • 39.4k
8 votes

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

I am surprised HVAC contractors won't do it. Generally you want an HVAC person who can ensure you don't backdraft your CO devices. In your case you aren't changing the output so you don't have to ...
Fresh Codemonger's user avatar
7 votes
Accepted

Will relocating my Central AC intake improve performance?

Most forced-air HVAC systems in Residential are both heating and cooling. What might be efficient in the summer will not be efficient in the winter. So, where do you live and which do you use more? ...
ArchonOSX's user avatar
  • 20.1k
7 votes
Accepted

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

If you only have access to the inside of the duct, and then only as far as you can reach, you won't be able to make a huge difference, but you might be able to reduce it a little. The sound is ...
fixer1234's user avatar
  • 6,118
7 votes

Bathroom exhaust fan without duct

Venting into an attic is terrible in North American climate zones (6,7,8 in linked map below); less so in arid southern zones (1,2). This will give you a sense of how bad this might be. Beyond that, ...
Aloysius Defenestrate's user avatar
7 votes

Bathroom exhaust fan without duct

Ack's answer is very good, so I won't repeat what they wrote. I will add that molds can definitely create a significant health hazard. I would get the attic inspected for the presence of hazardous ...
End Antisemitic Hate's user avatar
7 votes
Accepted

Is there a reason to replace 50 year old metal ducting in the crawlspace with modern insulated flexible ducting?

I see no reasons for replacing the existing ductwork with flexible insulated ducting unless the existing ducting has rusted out. I would just re-insulate with 3” fiberglass wrap if the existing metal ...
Programmer66's user avatar
  • 2,742
7 votes

How should I repair a hole cut into a heating duct?

The best is to cut a piece of metal larger than the hole and attach with sheet metal screws. You can cover this with duct tape but if the metal fits properly this should not be necessary. If you do ...
Gil's user avatar
  • 7,011
7 votes

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

A dryer heats air, blows it through the clothes so the air loads up on moisture, and then... you got a load of hot moist air. Oldskool dryers just dump that outside, which gets rid of the moisture and ...
bobflux's user avatar
  • 9,853
7 votes
Accepted

How should I connect misaligned round ducts inside a cabinet?

I see no reason you couldn't use a short length of 7" flexible duct. Obviously, a long flex is a bad idea because it restricts flow, but for that few-inch offset, flex will do you fine.
Chris O's user avatar
  • 6,795
7 votes

Is it ok to run dryer duct under an electrical panel?

No. NEC 110.26(E) Dedicated Equipment Space. All switchboards, switchgear, panelboards, and motor control centers shall be located in dedicated spaces and protected from damage. Exception: Control ...
NoSparksPlease's user avatar
6 votes
Accepted

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

I'm confused/surprised by the existence of the void, but if you've got the space, then go for it. The only bit of mathematics to be concerned with is matching the cross section of the various ...
Aloysius Defenestrate's user avatar

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