Questions tagged [ducts]

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Can I reduce the size of my baseboard diffusers?

We are going through a home remodel. I want to replace our baseboard diffusers because I feel they are too big for the vent. The size of them are 25inches. The dimensions of the vent are 12 Length x 2....
Justin Whiteside's user avatar
0 votes
1 answer
36 views

Two flex ducts connected to metal trunk duct?

Trailer from the 70th. Metal square trunk duct ( 58') runs underneath, no branches. There were two flex ducts connected to the trunk duct, to the left and right of AC unit. Connected with a splitter ...
Jane Christie's user avatar
0 votes
1 answer
42 views

Connecting 10"x3.25" rectangular duct in wall cavity

I'm trying to run a few heat ducts in my basement with 10"x3.25" rectangular duct in the 2x4 framed walls to bring the heat down to the floor. I'm using S cleats on the long edges and drive ...
Brad Mace's user avatar
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113 views

How to effectively waterproof an exterior vent cap?

This is a follow-up to my other question. My house has a wood frame and vinyl siding. Installer came out to do a range hood install and for the outdoor vent cap he just sealed it with silicone to the ...
Should have done it myself's user avatar
0 votes
1 answer
95 views

Would it work to have a pellet furnace with heat pump AC on same duct trunk?

Here is the idea. I would like to have my heat pump trunk tied to my new pellet furnace for effective heating throughout the house in the winter with a fraction of the energy usage. And then close off ...
chalupien's user avatar
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0 answers
51 views

Can I increase CFM by combining two ducts into one?

From the plenum can I connect two 6" takeoffs into a single 8" with a Wye, then run 20 feet of 8" flex, then split again into two 6" via a Wye and go to to two separate rooms? Does ...
user182436's user avatar
0 votes
2 answers
89 views

How can I reconfigure a range hood duct to be centered on the wall?

I would really like to center a new 30” rangetop on our kitchen wall. The original cooktop was off-center to the right. After removing the cabinet doors over the cooktop I discovered that the range ...
slock's user avatar
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2 votes
0 answers
80 views

Adding return air vents in bedrooms to reduce return air noise and increase total return air capacity

I did my homework here the best I could and I hope someone can help by checking my work. In an attempt to make things as clear as possible, I made the following diagram. This is my existing system ...
deefofum's user avatar
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0 answers
23 views

Dryer vent clogged flow sense

I had a dryer that I was using for awhile and it started taking forever for the clothes to finish drying, it felt super moist and warm inside the dryer. I preassumed the dryer was the issue, I ...
Megan Strickland's user avatar
0 votes
1 answer
45 views

My HVAC filter seems to lack sealing. Do I need to do anything about it?

I recently got a new heat pump installed. I realized that the filter is just slid in without any door or sealing, see here: I find this a bit odd because everything else (the ductwork incl the return ...
divB's user avatar
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39 views

Downsize Flex to Rigid Duct

I have the AC air handler in a pretty tight spot in my home. It's a bit hard to tell in the picture but main return for the system comes in a 12-inch flex duct and makes this tight S shape to connect ...
Bizarro181's user avatar
1 vote
0 answers
76 views

How can I reduce range hood duct size for best performance?

I currently have a range that was hacked in terribly by a previous contractor with flex pipe. I want to replace it with rigid duct to make it quieter and increase performance too hopefully. The range ...
cyboman's user avatar
  • 11
2 votes
1 answer
81 views

Ductwork: redesign supply from flex to rigid

I’m in the midst of a project to make my basement space more usable, a big part of which will involve shuffling ductwork as it appears to have been installed (during the previous owner’s tenure) with ...
JimboSlice's user avatar
1 vote
2 answers
94 views

How to reinforce around large HVAC opening in subfloor

The HVAC installer cut a large return grille for a pan return (I'm aware this is not ideal). I'm nervous about the floor/subfloor structure since it goes the long way (parallel to joists). How should ...
Nate's user avatar
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0 answers
46 views

Removing ice blockage between freezer and fridge in GE Monogram side-by-side

I have a GE Monogram Fridge/Freezer Model # ZIS42NYB, Serial # SV036084. It's about 25 years old and I'll probably replace it as money/time permits. HOWEVER, I'd like to have it limp along a little ...
Dave's user avatar
  • 141
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0 answers
24 views

Closing my basement vent

I am in the process of setting up electric baseboard heaters in my basement and I have 3 vents that runs from my furnace. Can I block those vent ducts?
Ella's user avatar
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1 vote
1 answer
74 views

Advice on over range microwave venting duct

We are replacing an old hood with an over range microwave where the circular vent hole is dead center in the cabinet above. The microwave we just purchased has the designated hole towards the back and ...
StephenB's user avatar
1 vote
0 answers
37 views

Air exchanger "fresh air to house" wye - should I leave it open or closed?

Background Just bought a house with a passive air exchanger: no internal fans, just motorized dampers moving air with the furnace fan. We have a thermopump, electric furnace and whole house bypass ...
msanford's user avatar
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4 votes
2 answers
2k views

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

I am looking to install an ERV in my house and am currently trying to determine good locations for the intake and exhaust vents. While I have identified other candidate locations for the exhaust vent, ...
Andy Hall's user avatar
  • 237
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0 answers
158 views

How to abandon under slab ductwork?

Our sub-slab ductwork (sonotube and sheet metal, no transite) is in terrible condition, so were switching to mini splits. We need to figure out how to safely and effectively abandon the current system,...
user177942's user avatar
0 votes
1 answer
307 views

Basement wall framing - Attaching top plate with pipes in the way

I'm laying out framing for a basement wall and currently stuck on how to attach the top track. The problem is there is a good sized heat pipe running parallel between two joists (the other ductwork I'...
EmPea's user avatar
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-1 votes
2 answers
65 views

Mini Split with Central AC

Is it possible/efficient to have One mini split unit in the living room and remove all the ducts in that room to then have the central AC only cool bedrooms?
Jona's user avatar
  • 1
1 vote
1 answer
140 views

OTR Microwave vent through wall, but on bottom?

I was replacing my over-the-range microwave and discovered the location of the existing vent. The vent is straight out the exterior wall, but down towards the bottom mounting bracket… I can’t seem to ...
Andrew Boisvert's user avatar
0 votes
2 answers
145 views

How should I connect flexible plastic duct to a metal duct?

I have an insulated duct like this: https://www.homedepot.com/p/Master-Flow-4-in-x-12-ft-Insulated-Flexible-Duct-R6-Silver-Jacket-F6IFD4X144/203420974 The actual tube inside is some kind of plastic. ...
Bege1986's user avatar
  • 113
1 vote
2 answers
168 views

A/C vent not connected to duct?

So I am in the process of doing a light reno to a bathroom in my 1954 ranch style home and I took off the a/c vent to wash it and/or buy a new one. To my surprise (okay not really surprise— there was ...
Olivia's user avatar
  • 11
0 votes
1 answer
47 views

Is it worth completely changing “acceptable” bath vent ducting to avoid reducing from 4” fan to 3” ducting? [closed]

I’m upgrading two adjacent small bathrooms with new exhaust fans. The existing ducts are 3” plastic/flexible. The builder has both 3” ducts terminating, side by side, out of a 5or6” roof vent. The new ...
JAndrew's user avatar
0 votes
3 answers
243 views

Can I reduce the size of my range hood duct without performance impact?

I'm installing a Zephyr Monsoon I (600 CFM) which has an 8" duct. The wall cap is 7" and instead of replacing the cap, I'm thinking of adding a reducer just before the wall cap from 8" ...
LVDIY's user avatar
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1 vote
2 answers
496 views

How to clean cat pee out out of floor registers/ducts?

We had an elderly cat with kidney issues who would sometimes pee in the floor registers. House has one level with a basement. Sadly he has passed on, but now at least we can clean things up without ...
John Gordon's user avatar
7 votes
1 answer
2k views

What do to with this vent?

I was in the shower yesterday and said "Oh no, a loose tile!". 5 hours after the shower, I'm here, as the tile was not just "loose" but water had gotten all into the wall and was ...
LarryBud's user avatar
  • 779
0 votes
0 answers
67 views

Duct connector for bathroom fan doesn't fit in the attic space. What are my options?

I am in the process of removing an old bathroom fan and replacing it with a newer Broan-Nutone fan. The new fan came with a 4" duct connector, which will require a connector to attach to my 3&...
ZbadhabitZ's user avatar
0 votes
1 answer
234 views

How would I fix this vent sides that are bending inward?

I have a vent with side walls that are bending inward, preventing the vent cover from sitting in the duct properly (it currently just sits on top of the bent portions). I can push the bent portions ...
Dillon Hertz's user avatar
1 vote
0 answers
34 views

Furnace Return in basement

I have a duplex and one furnace crapped out likely because it had the return in the basement. It’s upstate NY, so it gets cold. If I want it done 100% right. I need ducts run all the way to the top ...
The Landlord's user avatar
2 votes
1 answer
419 views

Whole house dehumidifier with no central air?

I moved into my home in the winter of last year after the house had been vacant for 1 - 2 years. In the summer during bouts of rain for 2 - 3 days, humidity levels in the house increase dramatically. ...
geoscience123's user avatar
0 votes
0 answers
52 views

Help understanding half-built ductwork

I'm trying to understand a new ductwork system that was half-built and then abandoned. It was built with a cold-weather heatpump and possibly an ERV in mind. It has four supply lines fully ducted ...
ElectronHammer's user avatar
0 votes
0 answers
22 views

Sealing opening from removed ductwork

I have a 1956 house near Los Angeles. We replaced the whole HVAC system 6 years ago, including ductwork. The contractor removed all the old ducts, but we still have all the old wall registers. They ...
KLW's user avatar
  • 1
0 votes
2 answers
539 views

Panasonic Bath fan options and venting question

I'd like to add two bath fans to our house. This sub has let me know that Panasonic are probably the best. But I figured I'd ask here about the venting and lighting options. I have good access to ...
Klonepeak's user avatar
5 votes
2 answers
2k views

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

My company mainly focuses on small refrigeration units and walk-ins. Although we do offer service and/or Replacements on air conditioning systems, it’s only 1/3rd of the whole show so, I’d be a liar ...
www.TEGdelivers.com's user avatar
0 votes
0 answers
28 views

Can I reconfigure two 5" ducts into a single line & what size should they be?

I am trying to move a floor register location. Currently I have two 5" HVAC ducts being fed from a 6" x 10" rectangular trunk. The one 5" run has the register in the middle of ...
Moe's user avatar
  • 11
0 votes
0 answers
25 views

I need clarification on specs for installing a second AC filter and box

I'm wanting add a second intake in my house. The filter will be a 12x12 so my question is. How far can I put the new filter from the blower? Is there a code regulation?
Mike Wilden's user avatar
1 vote
2 answers
41 views

HVAC question about Evaporator Coil repair

My evaporator coil was recently replaced (Carrier CNPHP6024ALAAAAA replaced with a bigger unit, CVPMA6124XMC). They sealed around the edges with tape. The original install was sealed with some kind of ...
amrog's user avatar
  • 347
0 votes
1 answer
429 views

Is a tear in outer foil of ac duct an issue?

I just noticed a tear in the main duct that goes from the air handler into the ceiling to feed the rest of the duct work. The tear is in the foil only and I cannot feel any air escaping from it, it ...
MZawg's user avatar
  • 267
3 votes
1 answer
393 views

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

My current dryer vent is preventing me from enclosing my back porch. I have a basement window I can use to vent the dryer, but it's on the other side of my electrical panel. Is it ok to run the ...
WitchUndertones's user avatar
0 votes
0 answers
162 views

Fix the noise this damper is making

I recently moved to a new house and the damper in the HVAC air duct is making this very loud noise. I think it is loose and flapping around as air passes through it. I tried to tape the handle, but ...
Moasson's user avatar
0 votes
2 answers
96 views

Sealing ducts myself

I have a furnace with AC in the basement. I have poor airflow in my top floor vents (furthest from the furnace). and even the room with the cold air return doesn't change temperature very quickly. ...
Camron B's user avatar
  • 141
-1 votes
2 answers
40 views

Ducted vent hood installation - taping up open penetrations

I was thinking of installing a ducted range hood in my home but there seems to be a lot of things to watch out for. I was watching this Youtube tutorial and one comment about "covering up open ...
user96104's user avatar
1 vote
1 answer
4k views

Should I replace this dryer vent duct w/ semi-rigid or rigid metal?

I'm a new home owner, and have been trying to look for ways to keep my house in fighting shape. Going down the rabbit hole I learned, some types of dryer vent ducts are very flammable. This prompted ...
stack back's user avatar
-1 votes
1 answer
73 views

From heat load to CFM and where does 400/ton come from?

Based on this answer I have finally calculated my heating load of the total house as well as the distribution for individual ducts (rooms). Note that the formula for the heat loads was: BTH/h = ∆T * ...
divB's user avatar
  • 1,201
0 votes
1 answer
93 views

Fixing existing substandard ductwork to improve flow & increase basement ceiling height

I'm doing a basement development. Before I build bulkheads and close up the ceiling, I want to fix a few things about the ductwork. As I understand it, you shouldn't have supply ducts coming right ...
Cody Templeton's user avatar
0 votes
1 answer
129 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
  • 1,201
1 vote
0 answers
157 views

Should my air conditioner be running its air directly through internal spaces?

Should a newly installed “ducted” split system be running its intake air directly through internal spaces, or should I demand that the system be sealed so that it only draws air from living spaces? I’...
Alex Peters's user avatar

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