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Questions tagged [ducts]

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0 votes
1 answer
32 views

how to connect misaligned range hood and elbow?

My range hood is misaligned from the elbow by 1.5". Is that too large a gap for flexible duct? THis is an 8" hood. I would like to avoid flexible duct since it traps grease and is ...
1 vote
1 answer
46 views

Bent ductwork at vent?

Am I looking at ducting that’s folded back into the vent in this picture? There was a return register before that just sat on top, and I went to replace it with an adjustable register but since it has ...
0 votes
2 answers
150 views

Can I remove this blocking in stud bays for a cold air return duct?

I've been troubleshooting a second floor cold air return that doesn't actually go anywhere. 1928 house, where 2nd floor was finished many years ago by other owners. I'm replacing the floor so decided ...
1 vote
1 answer
46 views

Tapping into existing flex duct -- bad idea?

This is in an old house with retro-fitted attic large HVAC system. It looks like the HVAC installers just skipped over connecting an existing 4" bathroom line for some reason. The bathroom has no ...
0 votes
0 answers
31 views

Is an HVAC Muffler/Silencer on Direct Vent Water Heater safe or appropriate?

I have a direct vent hot water heater and it makes a good amount of noise near it and also to the upper levels since it is in an unfinished room in the basement and the floor trusses above allow for a ...
2 votes
1 answer
99 views

How can I connect my dryer to this misplaced wall box?

Home builder seems to have put this pipe too close to the wall, so it is making things very difficult to get anything connected to it in order to exhaust properly. It originally had this dryer elbow ...
0 votes
1 answer
46 views

New HVAC install, wrong size media filter?

The 20x20inch media filter doesn't seem to be the right size between the return plenum and the blower box. I am worried I am not getting the optimal airflow from return to supply. If its not would be ...
0 votes
1 answer
20 views

spray foamed attic floor now replacing flex duct

The duct work in our attic needs to be replaced. When the house was built 20 years ago the attic floor was spray foamed. The flex duct work now needs to be replaced what is the best solution. Should ...
0 votes
1 answer
112 views

How bad is this bathroom fan duct setup?

Bought a house about 9 months ago. Largely been good, but we've been having issues with the bathroom ventilation fan dripping moisture back down after longer/hotter showers, and generally not doing a ...
12 votes
2 answers
141k views

What does a Summer/Winter switch on furnace air ducts do?

On some of our furnace ducts, there is a switch/valve for Summer/Winter or S/W. What does changing this switch/lever accomplish? Can bad things happen if I forget to switch it? Bonus question: ...
0 votes
0 answers
20 views

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. ...
1 vote
0 answers
27 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 ...
0 votes
0 answers
36 views

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 ...
0 votes
0 answers
27 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 ...
0 votes
2 answers
52 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 ...
0 votes
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 (...
2 votes
1 answer
5k views

How do I fix a loud intake vent?

In the master bedroom, there is one of four intake vents in the house, and this particular one is very loud. Our house has two vertical air shafts that run parallel to each other, one for supply and ...
0 votes
0 answers
74 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 ...
1 vote
1 answer
29 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 ...
0 votes
2 answers
108 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. ...
0 votes
1 answer
62 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 ...
0 votes
1 answer
52 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 ...
0 votes
1 answer
72 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 ...
1 vote
1 answer
252 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 ...
2 votes
4 answers
26k 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, ...
2 votes
1 answer
193 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 ...
0 votes
1 answer
352 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,...
1 vote
2 answers
158 views

How do I seal leaky air ducts?

I have duct work in a house that I recently bought were it looks like some ducts were removed and then just sealed over with a metal sheet. The vent seems to be leaking air and in my opinion should be ...
0 votes
2 answers
56 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 ...
1 vote
2 answers
282 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 ...
7 votes
5 answers
94k 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 ...
1 vote
2 answers
1k views

Brown spots on ceiling below ductwork

Any idea what these spots might be? They're isolated to just one spots on my ceiling. My ductwork is right above this area. Thanks!
2 votes
2 answers
137 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 ...
0 votes
3 answers
549 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. ...
1 vote
2 answers
79 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....
1 vote
1 answer
164 views

Why is my HVAC return duct near ceiling next to supply duct? [closed]

I've owned this home for about a year and this has always intrigued me. My 2-story home has a supply duct nearly pointing at a return duct in the center of the hall upstairs. Two questions: Would hot ...
0 votes
1 answer
101 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 ...
0 votes
1 answer
105 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 ...
0 votes
0 answers
268 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 ...
0 votes
0 answers
72 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 ...
0 votes
2 answers
229 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 ...
2 votes
0 answers
186 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 ...
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 ...
0 votes
0 answers
50 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 ...
0 votes
1 answer
63 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 ...
0 votes
0 answers
42 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 ...
2 votes
1 answer
103 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 ...
1 vote
0 answers
173 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 ...
1 vote
2 answers
100 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 ...
2 votes
3 answers
5k views

How do I re-route this wall register to exit a cabinet base?

I am redoing our kitchen, and adding more cabinets. This register ended up behind 2 cabinets. How should I route the duct to 1 or 2 toe kick vents? Do I need duct work under the cabinet, or can I just ...

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