Questions tagged [ducts]

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Passing insulated duct through floor

A bathroom exhaust fan's instructions call for 4 inch insulated flexible duct to minimize noise and to prevent condensation in the attic space. The duct has to pass through the attic's floor boards at ...
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How do I connect these two pieces of dryer duct in my attic?

I am about to install a Dryer by mounting it on the wall in an inverted fashion, and then venting it through an existing dryer vent setup that has been designed with a duct joint that goes into the ...
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4 answers
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How to re-route range hood ducting to my vent?

My current range vent does a wonky turn around and prevents the cabinet door from closing fully. I'm trying to figure out an alternate way to make the connection, but don't really have any good ideas. ...
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Can black stove pipes be used for ductwork?

Can I use black stove pipes for ductwork in my garage? I'm reading that I need 26 gauge duct pipes for garages, and it turns out that 24 gauge black stove pipes are a cheaper option (at least at Home ...
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Ten inch height HVAC duct

We are replacing a branch of the main HVAC distribution ducts in a 70's home that uses forced air from a gas heater. The HVAC distribution duct is rectangular 10 inches x 16 inches - which supports ...
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2 answers
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Seeking advice on reducing size of register opening in order to fit standard grill

first time poster here. I'm currently replacing the wall registers throughout my house. Each opening is a standard size except for one, so I'm looking for feedback on my plan to effectively decease ...
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3 votes
1 answer
572 views

Is it a good idea to go all ductless? [closed]

I have a 2000 sq ft house in TN(mostly air-conditioning is used, winter is mild) and the house has 2 trane gas furnace for heating(both 25+ yrs old) that need to be replaced, one 25+ yr old air ...
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2 votes
1 answer
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3-Story House Balancing Questions - Duct Traverse done with data

I have a large 3-story home in the northeast that has all three floors completely finished. We suffer from the classic balancing issues many people post about i.e. not enough cool air upstairs in the ...
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Does a basement bathroom exhaust fan duct need to be insulated?

We have a bathroom in a finished basement. While removing the old bathroom fan I discovered that the duct pipe leading outside is not insulated. Should the bathroom fan duct be insulated traveling ...
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2 votes
1 answer
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Fire damper required/advised in 2 family brownstone?

TL;DR Does New York building code require fire dampers for partial renovation of four storey brownstone with two family CO? I live in a two family New York brownstone which is undergoing a partial ...
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Why is there shimmery white dust coming from my floor vents?

There is a white dust settling around all of my downstairs floor vents. It’s got a shimmer to it. I haven’t noticed it upstairs coming from the ceiling vents. We had all new HVAC done a year ago when ...
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Lennox 80mgf3-75a-3 furnace 4 flashes of one LED after gas burns, takes forever to heat

I have a Lennox 80mgf3-75a-3. Here is how it is operating: Thermostat sends signal Gas burners come on in about 20 seconds (LED flashes slowly and simultaneously - furnace has only one LED ) Then ...
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Why vent on first floor blows cold air mostly and hot air sometimes?

My house has 3 floors and gas furnace is on 3rd floor. First floor has total of 3 vents but one of those blows cold air most of the time and hot air rarely. The other 2 vents on the same floor blows ...
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  • 101
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1 answer
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Replacing 1-Stage Furnace & A/C for Comfort & Efficiency

Need opinions on imminent HVAC work in a Massachusetts home. House and HVAC system descriptions below: House: ~45yrs, 1850 sqft, 2 floors + unfinished basement (furnace located in basement). Each ...
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Advice installing a vent on roof

Installed a new bathroom fan today and realized the ducting is way undersized. 9'x15' room and a very tiny fan with 3" ducting. I replaced it with a 110CFM Panasonic fan. So I can't use the ...
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How to route/replace HVAC plenum/trunk lines through a poorly designed foundation wall hole with a gas pipe in the way on the other side

New homeowner of a 1959 constructed house. Surprisingly, only 4 owners (including myself), with the last 2 each having it for about 20 yrs and each seemed to be DIYers - not necessarily choices I ...
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DIY - Vent Duct Cleaning of small condo with no ductwork - Power of Shop-Vac, tools, tips needed?

I own a small condo, 870 sq ft, built in the 70's that does not have any metal ductwork or any ductwork at all. (I looked in the air conditioning vents & all I see are the studs and drywall.) ...
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1 vote
1 answer
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How is the ideal plenum volume, shape and take off configuration determined? [closed]

I'm hoping to learn some general rules for plenums coming directly off equipment in typical single family HVAC. Most of all, I'm curious if it is good design to keep the plenum only large enough to ...
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1 vote
0 answers
60 views

Attic HVAC ducts are in the way. What should I do?

Just moved in to a new house back in September and I want to add some pendant lights in the kitchen. Went up into the attic and looked around... The main HVAC duct bisects the attic and I will have to ...
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Popping sound coming from duct

Whenever the furnace is turned on or off, there’s a spot right below my bedroom floor where vent is, the duct would make a popping noise for about 5-10 minutes. Unfortunately the duct is not ...
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0 votes
2 answers
127 views

How big of a duct and grill do I need for a central cold air return on a 3 ton system?

What size grill and duct do I need for my cold air return to fit between wall studs in the following scenario? I have an open-air return in my basement mechanical room with no cold air return ducts or ...
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2 answers
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Bathroom venting 2 in 1

I have Installation where I will use two bath fans. One in the half bath and toilet and sink the other outside where the shower will be. I would like to combine the two into 1 the outside the house
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0 answers
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HVAC duct issues

Purchased a home a few months ago that was gut rehabbed with new AC + furnace + ductwork and left vacant for a year. A few weeks after moving in I took a chandelier out of the ceiling in the dining ...
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2 votes
1 answer
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How to avoid sealing duct joints inside walls?

I am trying to replace a very short amount of duct work for my range hood and am having a bit of an issue figuring out how to seal/tape the joint between the 6" elbow duct and the wall cap. ...
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2 votes
1 answer
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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 ...
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Replacing flexible HVAC duct with rigid metal ones

I am in the process of replacing some flexible HVAC ducting with rigid metal ducts (mostly because I wanted to deal with poorly done and leaky registers, but also because I just do not like the ...
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0 answers
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Is it code to create a return vent that goes directly to a furnace room from the floor above

My first-floor apartment (in a townhouse/brownstone) didn't have a return air duct installed and is instead just sucking in air from the boiler room with a large open return. The architectural plans ...
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0 votes
1 answer
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What is the purpose of this metal piece?

Attached is pictures of my HVAC plenum, where it meets the ceiling. Recently I had water damage(from upstairs neighbor) and I had to replace entire ceiling. After new ceiling I see this gap (yellow ...
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5 votes
2 answers
816 views

What's the minimum clearance from drywall when installing rigid duct work?

What's the minimum clearance required when installing rigid duct work on vertical walls with drywall and 2x2 framing. If I don't install drywall behind the rigid duct work for which there's only 1/2&...
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0 answers
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Casement Windows: Install Thru Wall A/C Indoors & Exhaust with Ducting

A family member has a business in a century-old building that only has industrial casement, awning, and pivot windows. There's no central A/C & a mini-split can't be hung outside the building. The ...
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3 answers
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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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0 votes
1 answer
104 views

How to remove slip and drive duct cleat when there is no room on the sides

I need to remove a 2-foot section of ductwork that got flooded so that I can rip out the internal insulation, but I don't see an easy way to remove the drive cleat since there is only about a 3/4"...
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-1 votes
1 answer
88 views

How to seal the frayed fiberglass border of internal duct insulation in the middle of a duct

I had to remove the bottom foot of internal duct insulation touching the ground due to sewage backup. Now that there is a frayed edge of internal insulation inside the ductwork with the remaining ...
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How to replace a supply plenum box with a blower sitting on top of it

I'll probably hire a professional, but I was curious if it's easy to replace a supply plenum box that already has a blower sitting on top of it. How would that be replaced, do you have to keep it ...
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0 answers
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How to correct an old bathroom ceiling vent fan duct (or lack thereof) in an old 2 story house

I'm fixing up an old home, built in 1930s, renovated in 1980s that has a terrifying fire hazard of a bathroom light/vent fan/heater in the downstairs hall bathroom. When this old unit was removed, not ...
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1 answer
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Should a HVAC return be partially closed in proportion to already closed supply branch in basement?

I have damper installed for each supply branch for my basement. There are six supply lines (5" flex duct each) for just basement. It covers 1100 sq ft (includes 1 bed room and 1 bath) for a 3 ...
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3 votes
3 answers
2k views

How should I repair a hole cut into a heating duct?

I found a large hole (~10cm x 10cm) cut into one of the HVAC ducts that supply the bedroom. It was cut between the duct and the joist and is not visible from the ground, I found it attempting to ...
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0 votes
1 answer
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Is there a reason to choose taped fiberglass bats vs fiberglass tubes when insulating heating ducts?

I'm going to insulate the 6" round metal heating ducts in my crawlspace, and I have pretty good access. It's the SF bay area, so it doesn't get very cold. Is there a reason to choose taped ...
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What is this duct part that was attached to a roof vent?

This plastic part was attached between the flexible duct and a roof vent. The vent was used for a bathroom exhaust fan. What is this part called, and what purpose does it serve? The roof vent was ...
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  • 710
3 votes
2 answers
241 views

Is there a reason to replace 50 year old metal ducting in the crawlspace with modern insulated flexible ducting?

My concern is heat loss in the chilly crawlspace. No AC here, only forced air gas furnace. The existing metal ducting in the crawl space is over 50 years but is intact. There is a very thin layer of ...
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  • 111
1 vote
1 answer
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My dryer isn't fully exhausting to the outside?

I recently bought a townhouse which has laundry in the finished basement. I noticed that our clothes took a bit more than an hour to dry in the dryer, so I wondered if there were any lint blockages. I ...
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3 answers
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Gas fired Forced-air furnace has a outlet grill in the mechanical room - can I remove it?

I just moved into a house with a gas fired forced-air furnace. Whenever I'm in the basement and the furnace is running I can hear a whistling noise coming from the mechanical room. I traced this sound ...
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0 votes
1 answer
53 views

Should I remove abandoned cold air return trunk?

When the furnace was originally installed, the first floor of my house had four cold air returns, two each on the long walls. When the kitchen was renovated in 2015 (before I purchased the house) some ...
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3 votes
1 answer
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Is this dryer vent installed correctly?

Should I add those vent straps? It seems pretty sturdy, but I want to be certain. Is it even in a good location on the wall? Everyone I spoke with said it looks fine, but still a little strange to me ...
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2 answers
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How to fit portable air conditioner hoses through a too small wall vent

Our apartment doesn't have A/C, but we do have wall ports for a portable A/C unit. Unfortunately, I can't really fathom how I'm supposed to hook the hoses up to the wall vents. As you can see, the ...
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0 votes
1 answer
149 views

In Slab Duct Work - Concrete / Cinder Block

I have some weird and what I believe to be abnormal duct under my home. I recently installed a brand new HVAC system and it's not running or performing as desired. I believe I am losing a ton of ...
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1 answer
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How can I install ducts on a high place in a building where I can't put nails or screws and where I can't hold ducts to install them?

It's a building like that and we need to install ducts at where the red line is. There is no near balconies or windows to help me put the screws in the wall. The ladder can reach up to the blue line ...
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0 votes
0 answers
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How do I shorten pre-installed ducts without cutting into the ceiling?

Upgrading a bathroom fan and I need room to convert a 3" duct to a 4" flapper on the fan (about 7" of length overall). The ductwork is rigid sheet metal and ran directly to the old fan. ...
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2 votes
1 answer
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What is this sealing material inside a duct collar?

Most of the duct dampers don't provide 100% seal from air flow. The below picture might be. I have collar with damper, But its just not enough to stop/bypass the air flow. what is this called in the ...
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  • 570
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2 answers
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One branch of my HVAC receives zero airflow, is there a design flaw with this layout?

Question: Why would the 6" duct (represented by the red X) produce almost zero airflow? I have a small piece of tissue attached to it to see that it's barely blowing anything. However, the blue ...
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