Questions tagged [ducts]

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3answers
7k views

How to Sync Booster Fan with Furnace Fan

I own an old house. Some of the rooms in the house that are too far away from the furnace are not getting enough air, the airflow is too weak. I tried to close as many of the other ones as possible, ...
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1answer
2k views

Should vent directly above furnace be open or closed

There is a vent in the duct directly above my furnace. This is in the air out side, not the return duct. Is there a reason I should have this duct open? It was open when I bought the house a few ...
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2answers
1k views

Sloped ceiling - remove hot air with exhaust fan

I have what I think is an unusual setup of a sloped ceiling that may offer an easy fix to my problem, but wanted to get some opinions from you guys. Our master bedroom, on the 2nd floor (top floor), ...
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1answer
150 views

Is there a way to change the location of HVAC air filter location?

We bought the house recently. Heating system was recently installed by the previous home owner. I cannot believe they did not think of this but the place for filter is inside the furnace. The problem ...
2
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1answer
127 views

Is it safe to use a flexible duct near the end of an 18ft dryer exhaust run?

I'm replacing a gas dryer in a condo that previously had 2 plastic flex pipes and a 5ft aluminum rigid duct. I planned to replace it with rigid steel. I got most of it dry-fitted correctly, except ...
2
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1answer
159 views

What purpose does the lining inside sheet metal duct serve?

Sheet metal ductwork is often lined inside with a black fiberglass insulation material. What purpose does the lining serve? Insulation is one answer, but ducts can be insulated on the external ...
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1answer
193 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 ...
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2answers
704 views

How do I patch a subfloor over a return duct cavity

I need to patch these holes in the subfloor where the vents are. These holes are from a return vent that is being moved, the joist cavity below these holes is a return duct. I'm assuming using ...
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0answers
24 views

How to fix noise in my bedroom since change of furance/ac but not air ducts?

I had furnace company back out and he told me it is probably a problem with a damper but it would be hard to find out where. It is only loud in my room on second floor but not in other bedroom next ...
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1answer
239 views

Is it safe for dryer vent ducts to overlap in different directions?

Hard to describe this in the title. What I'm referring to is how segments of duct overlap each other where they are connected. Ideally, as with plumbing, the tube the flow enters should be overlapped ...
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4answers
2k 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 ...
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1answer
81 views

Placed Fire Place Insert Wood Stove into Fire Place; how to minimize heat loss through former chimney damper opening?

The chimney damper for our fireplace is the standard dimensions of 24" x 5.5". I removed the metal damper when I bought the fire place insert wood stove so there is just the damper opening with said ...
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2answers
3k views

Can I install a modern furnace without ductwork?

I removed an old coal furnace from my basement. The furnace did not have any duct work to speak of. There was an exhaust pipe which fed into the chimney and a duct that went into the next room, but ...
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1answer
5k 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 ...
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2answers
8k views

How long can I run a vent duct for a new bathroom exhaust on an old house that doesn't vent out properly?

all. I live in an old Edwardian home where the attic above is a finished loft space so I can't run any ducts upward. I have a second floor bathroom below that needs to be vented correctly. Right now ...
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1answer
2k views

Need Assistance Wiring a Duct Booster Fan

Morning, folks. And thanks in advance for any assistance you can provide. We have an in-line duct fan in the attic. It assists in moving air from the central HVAC system into our addition. It is ...
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3answers
796 views

Can I funnel the output of a portable air conditioner to direct it?

I have a portable air conditioner similar to the one in the picture below. I want to direct the output flow through a small duct system to the feet of people sitting on a large table. Can I just tape ...
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1answer
430 views

Fiberglass or reflective roll insulation for duct work?

I have some exposed duct work in my garage. I am looking to insulate it and was looking at the types of insulation. Is is better to use fiberglass or "bubble wrap" reflective roll insulation? I live ...
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0answers
155 views

8 in thimble, 6 in pipe

I just installed a wood stove in the addition I built for my trailer. My father-in-law insisted on going and buying me an 8 inch thimble for my stove pipe to run through the wall. My stove pipe is ...
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3answers
3k views

Replace Over the range microwave with hood

I currently have a ductless over the range microwave. It's too close to the range. The heat from the range is melting the microwave handle. I want to remove the microwave and cabinet and replace it ...
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1answer
2k views

Dryer venting options on second floor with gambrel roof

In redoing our second floor laundry closet, we'd like to replace the flammable flexible plastic dryer duct with rigid duct and a better vent. I did extensive research, but couldn't find any ...
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1answer
477 views

Can I replace round ducts with rectangular ducts in a basement renovation?

I'm renovating my basement and the big round 7" ducts that cross under the ceiling joists are in the way. I'd like to convert them to 3.25" by 12" flat rectangular ducts, so that the ceiling can be ...
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0answers
230 views

how to deal with oversized furnace

I recently got a new furnace for our 1200 sqft house in Denver CO. We are planning on adding a second story in a year and I was going to wait until we did that to replace the furnace. Then the furnace ...
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1answer
1k views

How best to secure rigid duct near a ceiling penetration

In order to vent a kitchen cooktop exhaust hood I am running rigid 6" round metal duct from my ceiling to a roof vent. The cooktop is on the front wall of my house. For aesthetic reasons I wish to ...
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0answers
486 views

Increasing exhaust fan duct size

I have a bathroom exhaust fan that has a 3 inch duct outlet. However, I would like to use a 4 inch insulated flexible duct. Is there an adapter I can use to accomplish this or do I have to first use ...
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1answer
77 views

Are these AC ducts beyond cleaning?

I moved into a upstairs apartment- studio 425 sq feet. The building is a 2 story building. It was built in 1971. I had a bad musky meldew smell in my apartment. My AC broke and the landlord placed a ...
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1answer
2k 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 ...
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3answers
327 views

How to cool a server closet with window?

I put 2 servers in my closet which run at about 90F. The closet has a window, but simply opening the window doesn't drop the temperature very much even when it is 60F outside. If I open the closet ...
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1answer
743 views

Ducts Spray Foam vs. Wrapping [closed]

I'm having some condensation issues with ducts in my basement. Based on what I've read, it sounds like I have to get a dehumidifier and wrap the ducts. I've wrapped a few, but it's hard to get the ...
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4answers
183 views

How should I fasten air exchanger ducts to unit?

I have an air-exchanger, and the hoses are little loose. That is I can feel the air flowing out between the motor and the hose. Here is a picture of the overall thing: Here is closer picture that ...
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1answer
145 views

Can a portable swamp cooler be hooked into a central air duct and recirculate?

I know that normally, swamp coolers take in external hot dry air, and put it out as cool wet air. I live in the hot So. Cal. desert area. A small swamp cooler is cheap to buy, but won't do my whole ...
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2answers
153 views

What is the proper way to connect a 4“ dryer exhaust to a 6” PVC wall exhaust?

Our dryer exhausts through a 4" opening, but the wall exhaust we will connect to is 6". The previous owners left an elbow / reducer, but it's beat up and basically falls out of the 6" PVC exhaust. ...
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2answers
419 views

Will relocating my Central AC intake improve performance?

Over this weekend, I have made a breakthrough scientific discovery that will likely change the world - hot air rises compared to cooler air! :) My Central AC system has its intake at the ground level,...
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1answer
67 views

Custom ductwork mixing box vs manufacturer accessory

I am trying to fit some equipment in a tiny space and the mixing box that the manufacturer sells has a 34"x5" opening on it for the outside air intake. I don't have anywhere close to enough room to ...
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2answers
1k views

Do I need to be concerned about moisture around dryer exhaust?

I have a dryer stacked on top of my washer and the exhaust duct attachment point is elevated off the ground. Or contractor had to build out the wall and create an area where the plumbing, gas and ...
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0answers
32 views

30 y.o. air pump troubleshooting. Where do I start?

500 sq.ft. apartment, 2nd floor, 32 y.o. through the wall, ducted air heat pump. The pump is installed in a closet next to the apartment (separate entry), and the air ducts spread from there along the ...
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1answer
477 views

Unsupported Subfloor Hanging Over Joist

I'm renovating a 2nd floor bathroom and I made the mistake of cutting out the subfloor flush with the wall shared by the doorway. The problem is that this wall sits between 2 joists so my new and ...
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1answer
6k views

In Canada, can I run Ethernet cables through air ducts?

I am planning to wire my new condo for Ethernet, but unfortunately I don't have the usual basement/attic access that homeowners enjoy. Barring that, the easiest way to route cables where I need them ...
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1answer
3k views

Can I move warm air from 2nd floor to basement to help with heating?

I have a finished basement with an open stair well to the 1st floor which even in the middle of the summer needs to be heated to stay at 69F degrees. There's also a large open foyer leading to the 2nd ...
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1answer
51 views

Frayed duct vent - can it still be used?

I removed an old noisy bathroom fan and the duct attached to it is just frayed. (If that's the word) I've tried cutting these ducts before and I just end up unraveling a bunch more than I should. That'...
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0answers
123 views

Running bathroom vent duct through cold air return

I am remodelling a basement and I noticed that the old bathroom has the vent duct running through the cold air return ( for about 6ft, in and out, the entrance and exit are sealed) and then outside. ...
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3answers
778 views

What does this lever do near my gas heater?

I am not entirely sure what this big duct work is for. Its not the exhaust, because im sure the exhaust is the smaller duct on the gar left side (exiting form the enter image description heretop). The ...
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2answers
3k 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" ...
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1answer
154 views

HVAC turning off below 30 degrees

A bit of a long post but I've tried to be as specific as possible I had a new Goodman HVAC put in Dec 2016 (model GPG1430060M41AB). For the last nine weeks the system has been cutting out when the ...
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0answers
67 views

Cut cross-break duct?

I bought a piece of rectangular duct from my local home supply store but it is slightly larger than what I need. The ducts they sell are cross-broken instead of beaded. Is it ok to cut down a duct ...
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1answer
886 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 ...
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2answers
704 views

Help with oversized furnace causing short cycle

I have just moved into a new home that had a pretty terrible HVAC system installed brand new by a flipper which has been causing me a ton of headaches. My house is 2000 sq feet, and the furnace is ...
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1answer
67 views

Can I reduce the size of a chase, to more closely fit the ducts within it?

I have a framed in rectangle in my kitchen. I recently opened up a section of it and can see that there is only a 7" round duct in the roughly 22" x 30"box. I am wondering if I can possibly re frame ...
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0answers
241 views

Reattach separated range hood duct in attic, without access

I'm refurbishing a kitchen, and removed all the cabinets to refinish them. The small cabinet above the range has the standard rectangular 10"x3.5" duct going through it to exhaust the fan. ...
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1answer
151 views

Extending a hard-to-access exhaust fan duct

Just pulled out an old bathroom fan. It was screwed to a 12-inch-long piece of non-flexible duct (so it came out with the fan casing). The end of the duct is buried in the insulation up in the attic. ...

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