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Questions tagged [ducts]

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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
0 votes
1 answer
165 views

How to do heat load calculations for distribution with common return and/or open floor concept

Many calculators (example) can obtain heating load or the whole house or of a single room with room based on area, room height and other factors (windows, insulation etc). My 1927 home has existing ...
divB's user avatar
  • 1,439
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
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
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
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
2 votes
3 answers
271 views

What is the difference between mold in air duct and mold that grows in crawl space?

Specifically, are they both dangerous to human health?
zundarz's user avatar
  • 1,037
1 vote
1 answer
206 views

How can I prevent makeup air vents from exhausting conditioned air?

The utility room has two 8-10 inch ducts running to it from the exterior of the home. There are also three fireplaces in the home, and we have noticed that occasionally the house smells like smoke, ...
EJ Moosa's user avatar
0 votes
4 answers
3k views

Is it safe to use an HVAC system even though the duct wrap contains asbestos?

In our rental house the furnace ducts are very dirty. We brought an expert to clean it, but he said he just won't do it because the tape around the ducts (in the attic) is probably asbestos. After ...
Amir's user avatar
  • 149
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
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
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
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
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
3 votes
2 answers
3k views

Is this open supply duct in my vented crawl space necessary?

New (first-time) home owner here (4 months in). I recently discovered what at first seemed like an un/disconnected supply-side duct in our vented (open) crawl space. Photo attached. After several ...
rokmeamadeus's user avatar
3 votes
4 answers
16k views

How should I route my dryer exhaust pipe?

My existing dryer vent run enters the crawlspace behind the dryer and exits through a vent that is part of one of the normal crawlspace vents. Since the house sits on a slight slope, the crawlspace on ...
Chloraphil's user avatar
2 votes
0 answers
137 views

How do I stop the ticking noise coming from my furnace duct? [duplicate]

I've had some HVAC people here to look at the ticking noise coming from our furnace duct. One of them installed a brace on the piece in question. This seemed to make the ticking less frequent, ...
thecoolmacdude's user avatar
2 votes
1 answer
5k views

How do I fix a loud intake vent?

In the master bedroom, there is one of four intake vents in the house, and this particular one is very loud. Our house has two vertical air shafts that run parallel to each other, one for supply and ...
Proxy303's user avatar
  • 594
2 votes
1 answer
3k views

Can I reduce the floor register boot size in my old house?

I am replacing the subfloor in my turn of the century house. After ripping up the old floor, I realized that the floor register boots are huge compared to the size of the supply ducts. For example, ...
Doug Hill's user avatar
  • 339
2 votes
2 answers
565 views

How can I get better HVAC airflow?

I recently purchased my house which was a new construction. Several of the vents are getting poor airflow but the installation company simply said it was normal but I suspect otherwise. I recently ...
Matt Young's user avatar
2 votes
2 answers
1k views

How to clean dryer ducts . Home is built on a slab

My home sits on a slab, I can only assume that the dry duct runs from the wall and under the house ( no crawl space.). there is a large pipe that exits the house on the outside where the cap is ...
kathy's user avatar
  • 21
1 vote
3 answers
4k views

What is the best way to clean a dryer vent?

I posted this questions 6 months ago.. Why does it take my dryer 3 hours to dry a load of clothes? I checked the cycling thermostat and thermal fuse. They are operational. I have seen different ways ...
mguzman72's user avatar
  • 119
1 vote
1 answer
7k views

Is there a minimum for spacing between take-offs from an HVAC trunk line?

I have to add 3 take offs from my main HVAC supply/trunk. Is there a minimum amount of distance I should maintain between each of the take offs? What should I do if I don't have the minimum distance ...
PowerTech's user avatar
  • 786
1 vote
2 answers
7k views

Pull insulated flex duct over rigid duct

The problem My vented attic in Virginia has rigid 6" ducts with insulation that is quite low around R-4, and also has many tears and rips. I would like to replace the insulation with R-8. After ...
joshdoe's user avatar
  • 319
1 vote
1 answer
1k views

How to Fix Ductwork that I Crushed?

I stumbled off of a step ladder and crushed this ductwork. It's in a bathroom and runs along the floor on a concrete slab between joists. The house is 50 yrs old. The ductwork looks like it's ...
Laxmidi's user avatar
  • 639
1 vote
2 answers
3k views

Is there some type of coating I can use to prevent condensate on my HVAC ducts?

I'm getting a lot of condensate on my HVAC ducts that run though my first floor (and HVAC blower) especially in July / August when humidity levels are outrageous (in NJ). The 1st floor space space is ...
virtualxtc's user avatar
  • 2,597
1 vote
1 answer
403 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 ...
DrTarr's user avatar
  • 396
1 vote
4 answers
9k views

Can I convert galvanized ducts to wood stove black ducts by coating it with high temp RustOleum paint?

I compared the black ducting for wood stoves with regular galvanized ducting and found that they are both 24 gauge and I noticed they are both steel since both tug magnets. There is quite a large ...
0tyranny0poverty's user avatar
0 votes
1 answer
243 views

implications of small bottleneck in ductwork

I need to vent a sauna room (~200F) with an inlet duct that will open below the heater and an outlet that will open near the ceiling at the opposite side of the room. The ducts will be small (2"). ...
Walrus the Cat's user avatar
0 votes
1 answer
3k views

Duct static pressure vs ambient air pressure

I've read that air handlers are typically rated for 0.5 iwc. Doing a simple conversion, this comes out to about 125 Pa. Is this with reference to the ambient air pressure? So, if I had an absolute ...
rith87's user avatar
  • 105
0 votes
2 answers
9k 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 ...
you786's user avatar
  • 117
0 votes
1 answer
11k views

Quieting cold air return vent

My gas furnace is in a dedicated "closet" inside the utility room. The closest cold air return is about 5' away (laterally) in the ceiling of the hallway right by the bedrooms. When the furnace ...
Ben Jackson's user avatar
0 votes
0 answers
454 views

How to replace a supply plenum box with a blower sitting on top of it

I'll probably hire a professional, but I was curious if it's easy to replace a supply plenum box that already has a blower sitting on top of it. How would that be replaced, do you have to keep it ...
MonkeyBonkey's user avatar
  • 1,209