Questions tagged [ducts]

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Properly venting 2 bathrooms using existing roof penetration (boots)

After some mold and mildew issues our bathrooms, I discovered that the bathroom fans in each room were routed directly into a 90 and up through the roof (and one was undersized to begin with). I'm ...
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1 answer
30 views

Need a product to change my round HVAC damper and diffusers to square [closed]

I am working on a remodel in my older home. Currently all of the HVAC is run through sheet metal ceiling ducts, most of which are 8" diameter, and then when they reach the rooms, flair out to a ...
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1 answer
31 views

Fix sag in soffit (faux ceiling) for duct work

We have a faux ceiling that houses duct work. The faux ceiling wraps around the interior of the house to hide duct work that otherwise cannot go in the original ceiling. I don’t love it but it came ...
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25 views

*Minimum* Duct Length for ERV Intake?

I’m installing a Panasonic Whispercomfort ERV in a bedroom wall stud cavity, furred out to 7″ D. The runs are simple — 4″ vertical flex followed by a rigid 90 elbow through the wall (I’d rather (2) 45’...
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61 views

How do I fix the tempertature differences between 3 floors in my house?

In my ~5000 square foot house, the finished basement is very cold, A/C set point stays spot on the main/ground level at 76F, but both upper loft areas 80-84 on hot days! It is a full height 2 story ...
1 vote
1 answer
79 views

Routing a dryer vent 2x6 rim Joists

In preparing to move our laundry to the basement I am stuck looking for a route out for our dryer vent in our basement. My initial plan was to run it out a rim joist like all the other posts I found ...
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3 answers
73 views

What are good strategies for fitting range hood vent ductwork in tight spaces

As a rookie, I’m not sure what strategies or approaches I should look into to get my range hood vent duct to make the necessary turns in a relatively tight space. So far, I have the rectangular-to-...
1 vote
1 answer
33 views

Can "restrictive ductwork" determination be temperature dependent?

Our house is 21 years old; we've owned it for nine years. Last September we replaced the HVAC system, not because it was failing but because it was essentially at its end of life. The new system, now ...
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2 votes
2 answers
191 views

What is this mystery ledge on the ceiling? (And can I put ducting through it?)

This bathroom needs an exhaust fan as the only current ventilation is a small window in the shower wall (which does not stay open). My project planning is blocked by my limited understanding of the ...
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2 answers
114 views

Should registers have gray duct sealant

Should the internals of a register where connections are made have gray duct sealant?
0 votes
1 answer
51 views

A/C air handler in Attic duct runs

I’ve noticed that all of my ducts in the house have great air flow where I can easily hear the air flowing from the vent. There is one room that doesn’t have good pressure and I can tell the room ...
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3 answers
87 views

Reducing noise from a large return register located on the door of my apartment's HVAC closet (inside)

My central air intake register emits a constant loud roar whenever the AC is blowing; it is so loud that it drowns out radio or human conversation going on. I have done some reading and learned that ...
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1 answer
70 views

Is it possible to have an air leak from the ductwork?

I live in a townhome condo, occupying the third and fourth floor of the building. The indoor AC unit is on my second floor and the ductwork is in the space between the ceiling of the first floor and ...
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1 answer
97 views

Why would part of my second floor not have any HVAC airflow?

I recently moved into a townhouse and found that on the 2nd floor, 2 rooms and bath doen't have airflow at all( no ac or heating). First tried with insurance company guys and he removed 1 damper which ...
2 votes
2 answers
93 views

Installing a bathroom vent duct through a concrete roof

I recently bought a two-story condo unit. I decided to replace the bathroom exhaust fans upstairs, but when I removed the old fans, I discovered the exhaust duct was not connected to the roof vent: ...
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2 answers
74 views

Which of these two duct runs would produce better airflow? Drawing Provided

Which of these two options would provide the greatest airflow. Hood fan is a 300CFM Vent-a-hood. 6" flange from the hood. All ducts are 6" I have a major constraint which is a gabled roof ...
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24 votes
4 answers
9k views

Do Americans in dense city centers vent their dryers directly outdoors?

I live in California in a normal single family home. My normal US dryer vents out the back into a duct that eventually goes out the side of my house - it vents moisture, air and lint directly to the ...
2 votes
1 answer
61 views

How do I connect this old bathroom fan to an insulated duct?

I want to connect this old bathroom fan to a new roof vent via an insulated duct. Of course, first I need to get rid of all the rotten insulation that was waterboarded with endless moisture from the ...
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0 answers
93 views

Anyone knows what type of conduit/duct/hose this is?

I have been looking everywhere for this hose. I don't know what it's called because it's very uncommon in our country. Tried searching for semi-rigid duct but it's not exactly what I'm looking for. ...
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0 answers
94 views

Sewer smell in basement bathroom ONLY when central a/c is on

whenever I turned on AC , I smell like sewer in Basement bathroom only. the rest of the basement and the house is all good. this happens only in Summer when AC is on- i checked the drain on Sink,...
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0 votes
2 answers
95 views

Water heater flue and fresh air intake letting in pests

The heater is in a closet in hallway. The flue is going up into attic. Attic insulation 3 yrs ago filled duct (pink insulation). Placed bug traps in closet, nothing 1st year. Lived in place 7 years ...
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0 answers
63 views

Can I blow insulation over exposed flex ducts?

I hired some HVAC professionals to place new flex ducts above the kitchen after a soffit removal. I know putting conditioned ducts in the attic is terrible, but the ceilings were 7' and it felt like I ...
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2 answers
115 views

Replace inaccessible dryer vent

While cleaning out my dryer duct, I accidentally pushed out of the three flaps on the louvered vent. The simple solution is to replace the vent. However, I cannot easily access the outside of the ...
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Question about duct work replacing a bathroom fan

I am replacing a bathroom exhaust fan with a humidity sensing model that automatically turns on when a specified humidity level is reached. The original duct is 3" wide. I had to get a 4" to ...
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-1 votes
2 answers
62 views

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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1 vote
1 answer
148 views

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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1 vote
4 answers
127 views

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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0 votes
1 answer
99 views

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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0 votes
1 answer
45 views

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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3 answers
164 views

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 ...
3 votes
1 answer
660 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
82 views

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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0 votes
1 answer
331 views

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
65 views

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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0 votes
0 answers
49 views

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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0 answers
17 views

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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0 votes
0 answers
64 views

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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0 votes
1 answer
56 views

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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0 answers
59 views

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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1 vote
0 answers
94 views

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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0 answers
22 views

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.) ...
1 vote
1 answer
165 views

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 ...
1 vote
0 answers
87 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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0 votes
0 answers
35 views

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 ...
0 votes
2 answers
354 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 ...
0 votes
2 answers
70 views

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
47 views

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
90 views

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
331 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 ...
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0 votes
0 answers
184 views

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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