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Questions tagged [ducts]

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1answer
34 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"). ...
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0answers
28 views

use of conduit for ducts

I need 2" ducts in this room I'm building. Flexible ducts and conduit are about the same price. I have high heat requirements. Can I use conduit for ductwork? What are the pros / cons? Thanks
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0answers
21 views

CAR duct in same bay as electrical wire

I'm going to install a cold air return (CAR) duct through an interior wall that has some electrical running through it. The CAR duct will run vertically, but near the bottom third of the bay there is ...
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3answers
48 views

Can I connect my two HVAC systems?

My house has two HVAC systems. One is in the attic and has supply and returns in the ceiling of the second floor. The other is in the basement with supply and returns at the floor of the first floor. ...
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0answers
13 views

Fan duct through cabinet

I have an auxillary ceiling fan in my kitchen and its duct needs to go 90° down the wall but the problem is I can't go around the corner. Can this go out the ceiling, go into the cabinet, and from ...
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1answer
43 views

Tape vs screw joining 4" duct

When joining 4" round duct, like for fart fans or dryers, is it sufficient to just use sealant and aluminum tape but no screw or should I be using screws also? It seems that the tape alone would be ...
0
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1answer
21 views

Can I remove the top plate at top of an interior NLB wall?

Is it safe to remove the top plate in one section of an interior non-load bearing wall between two studs space 16" apart? The reason I ask is because I need to run some ductwork to my cold air return ...
0
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1answer
20 views

How to minimize ceiling “backwash” of air circulation in an attic HVAC system

I'm remodeling and placing a new HVAC unit in the attic. The dining room is central on the house, adjoined by the living room, kitchen, service bathroom, and (directly or via a hall) all three ...
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0answers
8 views

reducing sound most efficiently from a furnace/AC intake in attic

I'm installing a new residential AC and heating unit in my attic. It's a Trane model TUD2B080A9V3VB. It does say that it doesn't recommend less than 36" distance from the intake and bottom of the ...
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0answers
44 views

Which kitchen hood ductwork option is better? [closed]

I want to install 900 CFM under cabinet hood with 8 inch exhaust going up. I have existing OTR ductwork that goes down to crawlspace and outside to the right. It is only 6 inch, and is also flattened ...
1
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2answers
73 views

How can I fix this furnace filter slot to prevent filters bending?

I noticed a problem with my furnace filter. In the vertical slot where it gets installed, there is a channel along the bottom but not along the top. As a result, the top corner of the filter ...
0
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1answer
22 views

Whole house dehumidifier- freestanding vs vented

I’m considering the purchase of a Dehumidifier for our basement, to avoid mustiness in the unfinished/unconditioned portion. I want a nicer quality HVAC-grade unit, both for energy-usage reasons and ...
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3answers
52 views

What type of crawlspace setup do I have?

New home owner here - I’m working on sealing the furnace ducts that run through our crawlspace. Previous owner used silver duct tape and not the proper mastic or UL approves aluminum tape. Long story ...
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2answers
33 views

Is a gravity or spring damper sufficient for a make up air vent?

I am planning on installing a make up air vent in my cold air return. I don't want to install an electric system that I have to wire to 3-4 different appliances. Is a gravity or spring loaded damper ...
0
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1answer
30 views

Will a make up air vent cause an issue in the winter?

I recently installed a gas range and I will soon be installing a 300cfm range hood. Since I primarily burn wood in the winter for heat and I don't want any back-drafting issues, I am planning on ...
3
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2answers
63 views

Is there any reason that plumbing can't be adjacent to a heating/cooling duct?

I'm installing a utility sink and the only place to put the plumbing (if it's going to be right under the sink) is either directly behind or infront of this vent... Is there any reason not to put it ...
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0answers
14 views

Exposed spiral duct clearance

I'm replacing concealed (in a furdown) rectangular HVAC duct in my kitchen with exposed spiral duct. With an eye toward maximizing head room (ceiling height is 9 ft), I would like to mount the spiral ...
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0answers
29 views

Round metal duct leaking water at crimped joint

Noticed a water leak stain in my ceiling in the drywall. Cut a hole and noticed water drops dripping from the joint of a metal round air duct. This duct leads to an external air vent on the side of my ...
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0answers
36 views

How do I calculate fan size for a single room exhaust system to reach a desired cfm when restricted to specific duct size/route?

I am wanting to exhaust a sealed room (except for air intake and exhaust). The room is 512 ft3, and due to positioning, orientation, and existing construction, I am restricted to using 6" flexible ...
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2answers
3k 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?
3
votes
1answer
108 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 ...
1
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2answers
74 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 ...
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1answer
29 views

6" Ducting straight to in-wall rectangular ducting

I have a vent for the microwave-range that goes from an interior kitchen wall to the outside of the house. I need to re-locate this, but I can't move the exterior vent fixture. It currently comes in ...
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0answers
54 views

HVAC: can a motorized damper be installed inside existing ductwork?

My HVAC system consists of a fan, furnace, compressor-driven AC, and evaporative cooler. The problem is that there is a large air volume used only by the evaporative cooler that is generating a lot of ...
1
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1answer
96 views

Is my plan for moving return duct a few inches ok?

Below is my ac unit and the return duct that connects to the blower. I currently slide my 1-inch filter under that pvc pipe that's inside the furnace. PVC is in the way and there is no L-shape latch ...
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3answers
108 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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0answers
24 views

Hood vent duct in floor - sealing it

I have an 8" duct that comes up through the kitchen floor (runs in subfloor between basement and 1st floor and vents outside) and through a kitchen cabinet bottom that will house a pop up vent. I can'...
0
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1answer
425 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 ...
0
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2answers
513 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), ...
1
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1answer
39 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 ...
0
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0answers
23 views

Is it normal for metal ring clamps to not make duct work air tight?

I connected some 4" round ducts recently that vented to the exterior. As I looked at them, I noticed, I could see light. I've shoved these ducts in as deep as I can get them (that's what she said) ...
2
votes
1answer
87 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 ...
3
votes
1answer
104 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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0answers
71 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 ...
0
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1answer
153 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
18 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 ...
1
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1answer
78 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
80 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 ...
0
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1answer
48 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 ...
1
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2answers
602 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 ...
3
votes
1answer
664 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 ...
0
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0answers
46 views

Can I put a fresh air intake near from a kitchen range vent

I have a question regarding the code for fresh air intakes. I saw in the code that a fresh air intake must be at least 10 feet (or 12, can't remember) from a 'contaminated' air exhaust. I assume ...
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2answers
2k 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 ...
0
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1answer
572 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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0answers
27 views

Debris on duct work

I have drop ceilings in my basement, but was up there to do some work recently. I noticed some debris on the air ducts. I was wondering if anyone knows what it is and whether or not I need to be ...
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3answers
318 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 ...
0
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1answer
269 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
40 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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2answers
958 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 ...
1
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1answer
625 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 ...