Questions tagged [ducts]
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297
questions
2
votes
1answer
40 views
Can I reduce the floor register boot size in my old house?
I am replacing the subfloor in my turn of the century house. After ripping up the old floor, I realized that the floor register boots are huge compared to the size of the supply ducts. For example, ...
0
votes
2answers
50 views
Do I need ductwork for a through-wall exhaust fan?
We have a small wine fridge beneath our counter that was having temperature problems because there was no ventilation to allow the heat to exhaust. The other side of the wall behind the fridge is a ...
1
vote
2answers
22 views
Water Heater Exhaust - how to connect the 3 inch hood to four inch exhaust pipe
I'm working on this gas water heater with 3" hood almost attached to an elbow that reduces from a 4" exhaust flue. This was only attached by a lot of aluminum tape. The problem is that the ends of ...
2
votes
1answer
118 views
Sewage smell from kitchen sink area
(An update is below the pictures.)
We just moved to our house in November and had to buy a new dishwasher. We had installers install it for us. A couple of months ago, we started noticing a bad odor ...
1
vote
1answer
53 views
How to accurately measure CFM with Digital Anemometer and Duct
We bought a digital anemometer to check the CFM of various fans we have on hand. My husband designed and 3D Printed this duct that securely mounts fans on to the anemometer for accurate readings, ...
1
vote
1answer
66 views
Re-purpose old water heater vent for bathroom exhaust fans
We just had our old gas water heater replaced with a tankless unit, so the vent for the old tank is now unused. I'd like to install exhaust fans in our 2 small bathrooms, and ideally use the old vent ...
1
vote
1answer
63 views
Can range hood venting ductwork be hidden behind crown molding?
Installing a range hood in older home going out the side wall.
Am I correct in thinking that the duct-work can be hidden behind the crown molding? (is realistic?)
Does the duct-work contain itself?...
4
votes
1answer
245 views
Venting Range Hood into Attic Space, Temporarily
My ductless recirculating range hood broke, and I have to install the replacement. I love to cook, so I'm installing a roof vent for a ducted hood.
The range hood I bought has good filtering for ...
0
votes
2answers
49 views
What should I do with the airflow in a sealed off conditioned crawlspace
First and foremost thanks ahead of time for everyone's help :)
I am in the process of finishing my basement and had some questions/concerns about "what to do with the air" in my crawlspace. In my ...
1
vote
2answers
48 views
What is the difference between these air ducts?
I'm fitting a portable AC into my workshop to take the edge off summer temperatures. For convenience, to make sure it works before bashing a hole in a brick wall, and to confirm it will help, I am ...
0
votes
0answers
50 views
Seal old ductboard from inside with duct mastic?
For the next few days, I have what appears to be an opportunity to easily and cheaply make a small improvement to the overall airtightness (or nearly complete lack thereof) of my house's 40 year old ...
1
vote
1answer
46 views
How large should a return HVAC duct be relative to the size of the supply?
I have a 4 ton American Standard electric forced air furnace (with no A/C - just heat) with a single speed blower motor, circa 2006.
My supply main trunk is 12"x20".
The return side of the system ...
1
vote
1answer
68 views
Can an 8" rigid duct be split into two 6“ flex ducts
I'm trying to finish an en-suite bed/bath that currently has a capped 8" rigid duct coming off the main trunk. What is the proper method to supply air to both the bedroom and bathroom?
The bedroom is ...
1
vote
1answer
48 views
What is the standard way to secure flex duct in an attic?
I was in a house and noticed that flex duct (or what I think is flex duct) is being secured via a strap that's looped around the duct and then nailed to an attic truss (see picture below). Is this the ...
2
votes
1answer
85 views
How to extend ductwork a few feet due to soffit
I built a soffit around my ductwork in the basement. There was originally air vents coming out of the ductwork to heat/cool the basement. However, with the addition of the soffit, the vents are now ...
1
vote
1answer
58 views
Removing or modifying bridges between truss or joists to make way for ducting
I want to run ducting for a kitchen extractor through the ground-floor ceiling of a two story building in order to get it to an external wall. The ducting would be running in the same direction as the ...
1
vote
1answer
39 views
Using larger pipe for range hood
My new range hood calls for 5" pipe. I was planning to use a 5"/6" reducer to convert to 6" pipe for going through my attic to the roof. I know that using a smaller pipe than what is called for is ...
0
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0answers
48 views
Best way to retrofit a dyer vent duct in 2x4 interior wall
My washer and dryer are located on the second floor of a two floor townhouse (crawlspace foundation). It's basically a closet that fits the two machines only, with very limited space front to back ( ...
1
vote
1answer
23 views
How should I insulate garage ductwork when no gap exists between ductwork and ceiling?
I currently have uninsulated HVAC ductwork running the width of my garage. There's no gap between the ducts and the plaster ceiling above it. There's also very little clearance between the ducts and ...
0
votes
3answers
72 views
How to safely clean rust and prep on a section of HVAC ductwork before insulating
So I have a small section (about 1.5 ft) of non-insulated ductwork with some rust right above my HVAC blower/furnace in the basement.
The rust seems to be caused by the water that sweats on that ...
0
votes
1answer
53 views
Furnace/HVAC issues in new build
Just had a couple of questions. I have been in new build townhouse for a month and noticed a couple of things but have been away several weeks so just dealing with it now. Some of this I am sure I am ...
1
vote
2answers
183 views
How can I attach/seal around an exhaust fan duct at the roof?
I am redoing the ducting from a kitchen exhaust fan to the roof cap. The old ducting was 6" and I'm increasing it to 8" to match the vent on the new exhaust fan. The current roof penetration is a 6....
1
vote
1answer
122 views
OK to cut double top plate to clear exhaust duct?
I am installing a exhaust fan duct in my 1st floor kitchen. I had planned to go under 2nd story joists/above kitchen cabinet, thru the wall. Unfortunately, the desired location on the wall would split-...
0
votes
1answer
59 views
What's a good way to minimize bends in a dryer transition duct?
I installed a new clothes dryer yesterday using the laminated foil transition duct the appliance store gave me. In order to get behind the dryer to access the duct, I have to pull the dryer out at ...
4
votes
2answers
1k views
How to make attic easier to traverse?
My attic is a maze of wires, air ducts and PVC water pipes. I went just one room over from the attic entrance and it took me a solid 30 minutes just to go there and back. Would it be unreasonable to ...
0
votes
1answer
55 views
Axial or centrifugal fan for short run out of kitchen?
I'm researching replacements for a broken extractor fan in my kitchen. It is wall mounted and runs through the wall straight outside, no long ducting involved.
The current (broken) fan is the ...
0
votes
2answers
38 views
How to fix placement of over-stove exhaust
The microwave over my stove expired. I pulled it down, and discovered that the ductwork to attach the fan to the outside world was misplaced: it's about two inches to the right of where it should be. ...
2
votes
2answers
46 views
Ceiling vent right next to wall. Ideas for grille cover?
The typical size 10x4 won't work because the wall is right next to it on one side (see picture).
I can buy a smaller size but then the question is where do I screw in the second hole.
Any ideas?
0
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0answers
29 views
Using existing hot water vent for extraction
I have a room in the basement with equipment (computers) that gets really hot. There is an ac vent but the thermostat is nowhere near the room.
Also in an alcove is the hot water heater behind a ...
2
votes
1answer
809 views
How can I duct through a new cabinet from a floor vent opening at the wall?
Got a window bench put in, but need a way to direct the air from the old baseboard vent register hole to out the front of the bench. NOt so sure a box store is going to have the proper vent duct parts ...
0
votes
0answers
32 views
dryer duct: connecting crimped end in dryer to crimped end in wall
A friend redid the in-wall duct for the dryer, leaving a crimped duct coming (slightly) out of the wall. Our dryer has a crimped duct emerging as well.
Friend, who has left the area, was probably ...
0
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0answers
14 views
water in insulation boards - best method to dry out
I have a horizontal flow brand-new HVAC unit, with a 1" thick insulation board plenum which has had some water ingestion on the bottom panel. The unit is in the attic.
I'm quite confident the water ...
1
vote
1answer
53 views
HVAC Air Blowback
Furnace/Blower: Rheem R92PA0851521MSA
Dual Zone System (Honeywell TrueZONE HZ311)
- Honeywell M847D1004 Actuators
Age of system: less than 2 years old including ductwork
Ive noticed that if Zone 1 ...
1
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0answers
40 views
Closing drywall to duct work
We are trying to convert some garage space into a gym, and one the we’re concerned about is all the gap space between the drywall and the ducting. We want to seal that off as much as possible for air ...
1
vote
1answer
45 views
How to re-purpose an exhaust fan using a 10x3.25 duct?
I'm currently remodeling my kitchen. Instead of a cooktop hood, I plan to re-use the existing ceiling exhaust fan. It looks to be about a 8" diameter fan that is inside a 10x3.25 duct that exhausts ...
1
vote
2answers
447 views
Cut Floor joists for HVAC
I own an old home, circa 1919. In the 70's, when the new furnace was installed, they cut through the floor joists to run the air ducts. Awesome. So in direct correlation to those cut joists, are ...
0
votes
1answer
81 views
Air Filter size for (new to me) home HVAC
My wife and I just purchased / moved into a new house and I was going through each of the systems and found the HVAC filter, it was literally destroyed (it had filled with crap and crushed itself in ...
0
votes
0answers
29 views
Rough in bathroom exhaust
So, I have a pretty basic question that I can't really figure out for some reason. Is there a way to rough in bathroom exhaust fans before siding? In other words, there are trim kits for sconces, ...
1
vote
1answer
77 views
Flexible round duct - What to use
I'm re-routing some 10x3.25" duct through a bulkhead in my kitchen. Planning to change over to 6" round duct for a 4' segment that is relatively straight (no 90s). It was my intention to use non-...
0
votes
1answer
39 views
How to connect dryer duct to wall?
I just removed a stove and fan, and am left with this rectangular exit for the fan exhaust.
I would like to hook up a dryer in place, and am wondering the best way to connect the round duct from the ...
2
votes
2answers
295 views
Should I insulate metal duct work in basement?
I have a balloon frame house with an unfinished basement. The air handler and furnace are in the basement too. Last fall, we had the duct work removed because it was wrapped in asbestos tape that ...
3
votes
3answers
2k views
Range hood vents into attic space
My house was built in 1976. I recently replaced the range hood and discovered that the piece of rectangular ducting that runs inside the cabinet is not connected to the outlet vent on the outside of ...
2
votes
2answers
207 views
Dryer vent through cinder block and then through yard - is this ok?
I've been researching how to vent my basement dryer, using galvanized steel ducts. There are lots of things on Google that show how to do this under a normal situation, but mine is unique, and I can't ...
0
votes
0answers
22 views
Air return proximity to furnance
We are refinishing our basement that wasn't original conditioned. New supplies and zoning were added by a contractor. We want to add an air return in the living space by tapping into the main return ...
0
votes
2answers
392 views
How do you remove and re-install Register Duct Boot?
Is it possible to remove and replace this register duct boot without screwing up the dry wall around it?
Large Images: https://imgur.com/a/lh9HIt2
1
vote
2answers
148 views
How to calculate CFM/pressure needed to move water vapor through duct?
I made a cheap, high capacity humidifier from a mist maker, storage crate, and 120mm fan (the fan blows into the crate, which pushes the mist out). This 4" flex pipe works fine to exhaust the mist ...
1
vote
1answer
618 views
Move floor vent into the wall
Currently right by the toilet in my bath there is a heating register on the floor. I want to build a small wall at the same location and have the heat exit out of the base of that wall.
Is there a ...
1
vote
1answer
74 views
Material for stud cavity cold air return
I'm totally aware of the arguments for and against stud cavity air returns so I don't need opinions on that, but I do need an idea of the best material for lining the outside of the stud cavity with. ...
1
vote
1answer
171 views
Dropped item in furnace duct
While trying to stop the ticking noise coning from my furnace ducts, I accidentally dropped a small piece of fire retardant foam (as you can see in the below photos) in one of the vertical furnace ...
2
votes
0answers
64 views
How do I stop the ticking noise coming from my furnace duct? [duplicate]
I've had some HVAC people here to look at the ticking noise coming from our furnace duct. One of them installed a brace on the piece in question. This seemed to make the ticking less frequent, ...
