The tag has no wiki summary.

learn more… | top users | synonyms (2)

3
votes
1answer
455 views

How do I support vertical runs of round ducting?

Supporting ducts horizontally seems pretty straight forward--just a loop of strapping underneath to support it. What about when the duct runs vertically? Do you use the same kind of strapping but ...
2
votes
1answer
358 views

What is involved in sizing and designing ducts and ductwork?

I have a one-story house, and it looks like it would be easy to run new ducts myself in the attic. What should I know before trying to design a duct system myself? I have seen ductwork that's metal ...
1
vote
1answer
172 views

What is the name of ducting I am looking for if they even make it?

I am looking for something like this but with an additional hole. Do they make this part, and if so what would it be called?
0
votes
2answers
547 views

tiles getting spongy and water coming up between the cracks

I have press-on tiles in my bathroom. We noticed they are getting spongy near the cooling vent. When I press it with my foot, I can see little bit of water coming up between the cracks. Duct work is ...
4
votes
1answer
3k views

How should one size ductwork for a new air return duct?

I recently had a contractor build a wall which split one room into two. The new room is an office with two computers, and four monitors. It gets very, very hot, until the air conditioning turns on, ...
2
votes
1answer
2k views

Does an air return duct do anything when the air conditioning or furnace is not running?

I recently had a contractor create a new wall which cut me off from the rest of the house. There is one AC/Heating vent in the room and when the door is closed it gets very, very hot. As soon as the ...
3
votes
2answers
3k views

Can I increase air volume by adding more fans?

I have a straight 25 foot rectangular duct that is 0.9 sqft in cross-sectional area (11" by 12"). There are openings on either end, and nowhere in the middle. I wish to move about 1000 CFM through the ...
4
votes
3answers
802 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 ...
3
votes
1answer
269 views

How should I attach laminate foil dryer transition duct?

I've got a laminate foil dryer duct coming up from the crawlspace. I need to attach my dryer transition duct to the exhaust duct, but these really don't like to go inside one another since they're ...
8
votes
1answer
419 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 ...
1
vote
3answers
343 views

How to hide light-colored wires in a dark-colored cabinet?

I'm installing some LED lights in a particle-board cabinet. The cabinet's walls have dark-colored veneers (nearly black), while the wires to the LEDs are beige, and would stand out quite prominently. ...
2
votes
1answer
495 views

Replace 7“ metal duct with 6” flexible or 8" flexible?

I am replacing the flexible ductwork in my attic, which is a mix of ancient 6" and 7" metal ducting. I'm having a hard time finding 7" flexible ductwork for sale locally, but no problem with 6" and ...
9
votes
4answers
8k 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 ...
3
votes
2answers
4k 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 ...
3
votes
1answer
934 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 ...
3
votes
1answer
106 views

It is reasonable to expect a contractor to replace the last foot of HVAC duct work, the connection between the insulated duct and the register?

The contract was to replace an antiquated HVAC and duct work. Since the registers are a standard size, would this connection also be a standard pre-fabricated part? What is that last connection ...
2
votes
1answer
2k views

Moving my washer and dryer will mean I'll need to move my dryer exhaust vent. How should I go about this?

I live in a two-story condo/townhouse. My dryer is downstairs in the kitchen and I'd like to move it upstairs. Right now, the exhaust vent runs up through the wall and under the upstairs bedroom ...
2
votes
3answers
178 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?
4
votes
5answers
4k 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.)
1
vote
2answers
183 views

How do I cut plastic duct?

I need to cut a few bits of 6” plastic duct, is there an easy way to do this? (Trying to get the ends squared using a freehand hacksaw does not look easy.)
2
votes
0answers
158 views

Is mold growing in my ductwork? [closed]

I am currently in a battle with my landlord over what I believe to be mold growing on the fiberglass liner of the ductwork in my apartment. He is having a specialist come to test it tomorrow, and I ...
3
votes
2answers
3k 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 ...
2
votes
4answers
16k 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 ...
1
vote
0answers
357 views

Where to buy plastic (temporary) air ducting in the UK?

Does anyone know somewhere (ideally online) I can buy plastic air ducting? The stuff I'm talking about is what they used on Mythbusters to make that helium 'airship'. It's just a large diameter tube ...
1
vote
1answer
679 views

Installing a duct fan

For a room in the basement we connected a ceiling register to an existing duct. It is not very strong, but I found this product that might make it a little more powerful: Does anybody know how ...
2
votes
1answer
1k views

What are some tips for installing a roof cap?

I am adding bathroom exhaust fans. The roof caps I have attach directly to the duct (this is not the model I have, but it clearly shows how the duct attaches): I had a lot of trouble trying to get ...
6
votes
1answer
837 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 ...
2
votes
1answer
4k views

What tape should I use to seal leaks in forced air heating system?

I have some of this duct tape Nashua 557 Premium Grade Flex Duct Tape. Is this the correct stuff to use to seal leaks in a forced air heating system, or is there something else I should be using? ...
2
votes
1answer
240 views

How large are in-wall heating vents that connect to registers?

I'm curious how large heating vents can typically be when connecting to in-wall registers. Do they fill up the entire space between studs? I'm framing for some drywall patches and would ideally not ...
1
vote
1answer
149 views

Fan between rooms?

I presently work at home, which means that I spend a lot of time in my office (ya think?). Unfortunately, this room is not a good one for air conditioning (or heating) in the house. I can often get 8 ...
3
votes
1answer
755 views

How hard is it to remove ducts?

I have an incredibly toxic smell emanating from one of my floor vents. I think one of my cats peed in the vent. Will I be able to remove the duct-work without ripping out the linoleum and sub-floor? ...
1
vote
2answers
1k views

Anyone heard of painting asbestos insulation tubes?

We recently had an old furnace inspected and the heating specialist mentioned that he suspected that the heating ducts had asbestos. He suggested painting them as an alternative to expensive removal ...
3
votes
1answer
211 views

Improve AC flow to secondary ducts

I have an AC which has 3 ducts coming out of it. Only one duct gets flow - I'm guessing the AC fan blows right into it. What can I do to improve the flow?
2
votes
2answers
939 views

How do I repair loose ductwork?

The ductwork in our 30 year old house has started coming loose where it comes up through the floor. It's nailed to the subfloor, but in several places, the nails have come loose, leaving gaps of an ...
3
votes
2answers
3k 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 ...
4
votes
2answers
3k 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 ...
12
votes
6answers
598 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 ...