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Attic flex run residential

Can I replace three 6” flex duct runs about 5ft long in two bedrooms, and one 10ft run on the third 3 bedroom (3 bedroom, 2 bath house). This is toward the opposite side of the fan end of the run. ...
Bruno's user avatar
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1 vote
0 answers
25 views

How to add duct to return

Currently renovating 1920 house. Took down this wall and noticed this was or is the supply return for upstairs. What bothers me is there’s no duct connecting to the vent. I do feel air being sucked ...
Bryan's user avatar
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how should I mount this air handler?

I'm installing a new 3-ton heat pump and am trying to plan the crawlspace installation of the indoor unit (1200cfm air handler with heat strips) and its connection to the existing ductwork. These ...
RustyShackleford's user avatar
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0 answers
25 views

Help identifying wall cap/plug underneath faux fireplace

Background I have an old home from the 1920's. It has a faux fireplace w/ no attached chimney. It appears to be originally added when house was built. There's a 4" galvanized metal cap on the ...
ravishi's user avatar
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2 answers
45 views

Should my bathroom vent duct go out the gable, 4ft from two other vents?

My bathroom fan seems to work OK but every few months we get black specks of mold forming on the ceiling. Both bathrooms in this house have 'popcorn' plaster ceilings, which seems crazy but is how it ...
cr0's user avatar
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0 answers
12 views

furnance vent flue proper attachment

I had a code inspector let me know that my HVAC furnace flue is not properly attached. I have looked all over the internet and i think its a new code requirement in my area in the past few decades (...
gene tsai's user avatar
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0 answers
58 views

Where should I install duct take-offs on a return plenum box?

I have a 5-ton system. My goal is to add an 8" return duct to a 15x9 guest room that has an 8" supply but no return air. When I went up to the attic to review my options, I saw that the ...
yayza's user avatar
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1 vote
1 answer
28 views

Who can diagnose and adjust automatic dampers?

I am trying to find the right person to diagnose and troubleshoot imbalanced zones and automatic dampers, but haven't been able to find anyone that seems experienced. Either the HVAC technicians seem ...
MonkeyBonkey's user avatar
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2 votes
1 answer
185 views

How often do dryers need to be cleaned out?

Of course I'm aware that the duct/vent should be cleaned, but I'm talking about partially disassembling the dryer itself and cleaning inside of it. In general, is this an item that should be on my ...
John Gordon's user avatar
0 votes
2 answers
47 views

Several furnace vent returns, but only one filter?

I have a 1980's construction house. It has a heating furnace in the attic that uses ducts to distribute the hot air to each room in the house. Recently, I bought air purifiers and I noticed that when ...
pkout's user avatar
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0 votes
1 answer
51 views

Replacing multiple 6” flexible ducts with rigid

I’m cleaning up ductwork in my basement and want to replace the runs of flexible duct with rigid. Current There is a group of 3 duct runs (6” uninsulated flexible round) that all have very close ...
Ellis Valentiner's user avatar
2 votes
2 answers
130 views

How to make ceiling vent go around ceiling beam?

I discovered my house kitchen vent doesn't actually vent anywhere. Since I cook a lot of Chinese food, it means the air is always oily. I bought a brand new high-powered ceiling fan, pulled out the ...
Village's user avatar
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0 votes
1 answer
50 views

Route return air duct through attic or pantry

I’m looking to get feedback about my options to remediate uneven heating/cooling and poor airflow for two of our bedrooms. Any help or ideas are much appreciated. I'll do my best to provide as much ...
Ellis Valentiner's user avatar
1 vote
2 answers
68 views

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
51 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
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1 answer
78 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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0 answers
200 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
102 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
66 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
188 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
121 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
31 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
54 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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0 answers
40 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
147 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
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2 votes
1 answer
96 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
95 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 votes
0 answers
61 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
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0 answers
25 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
97 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
40 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
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0 votes
1 answer
303 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
482 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
67 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
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1 vote
1 answer
212 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
178 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
242 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
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0 votes
1 answer
56 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
515 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
582 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
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0 votes
0 answers
76 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
437 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
600 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
53 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
23 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
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0 votes
2 answers
1k 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

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