Questions tagged [ducts]

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21 views

Should I move an HVAC vent to the ceiling or on the opposite interior wall?

The below picture shows the current position of the vent (the white area over the sink). The blue patch above the toilet is a small window. The plan is to relocate the bath tub and position it along ...
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23 views

How to calculate whether it's worth turning on a fan to bring warmer air to a heat pump hot water heater?

I have 4 new Rheem 50 gal heat pump hot water heaters being installed in the basement of my home/multiunit property that is a 4-unit building (one heater per apartment). Generally speaking, the attic ...
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1answer
77 views

Open duct found in ceiling

I cut a hole in a basement ceiling drywall and found an open duct at the end of the span between the joists (see photo). I'm sure this isn't good for the efficiency of the hvac system. What are the ...
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1answer
32 views

Encountered two different kinds of dryer tape (metallic silver plastic vs actual foil)?

Up until now, I thought dryer tape and foil tape were the same thing. So when I bought the first roll I didn't think too much of it. The first roll I bought was looked like silvery metallic coloured ...
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1answer
29 views

Can this stack air duct be removed to tear down small wall?

I have an appointment with the HVAC supply business that installed the furnace 2 years ago but it is months away. My question is can I remove this wall to make my shower bigger? Through research I ...
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22 views

Is there such thing as secondary lint traps for rectangular dryer ducts? [closed]

I have been searching online for a couple weeks now without any luck. There are plenty of secondary lint traps that install along a run of standard 4” rigid metal duct. I’m looking for a secondary ...
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26 views

Help reroute cold air return

I am working on opening up space between my lobby (on the right side of the wall) and the dining room area (on the left side of the wall). The section of the wall that is used as cold air return ducts ...
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1answer
84 views

Can someone identify this HVAC duct component?

Getting ready to redo duct insulation. On supply ducts off the trunk there are some sort of valve-like devices teed into the duct and oriented to point down. Same diameter as the duct. Butterfly ...
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1answer
40 views

Bath exhaust fan issue

We closed on this new construction townhome in January 2014. 6 1/2 years later, cleaning the Panasonic exhaust fans in all 4 bathrooms, to my astonishment, basement bathroom fan has no ductwork. Fan ...
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1answer
29 views

Type of insulation for flexible aluminum duct?

I’m replacing an undersized bathroom exhaust fan with a larger one that has a higher CFM. When switching the fan out, I want to add insulation to the flexible aluminum duct that goes from the fan to ...
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27 views

Sharing kitchen hood and kitchen ventilation through one duct

My kitchen currently does not have a kitchen hood, so I'm planning to install it. At the moment there is a ventilation duct, my idea is to connect the hood pipe to the ventilation pipe in the drop ...
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1answer
402 views

Can a motorized damper be installed inside existing ductwork?

My HVAC system consists of a fan, furnace, compressor-driven AC, and evaporative cooler. The problem is that there is a large air volume used only by the evaporative cooler that is generating a lot of ...
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2answers
299 views

Is Complete Ductwork Required to Start the Condensor?

I'm in the middle of rebuilding my entire AC system. I've got one 14" return and two 8" supplies hooked up to the blower (on a 2 ton system). I plan to add much more, but for now I want to ...
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1answer
26 views

Use a concrete core drill (6") on plaster lath?

I'm installing a range hood vent through a double brick wall, so I need to rent a core drill and 6" core bit. Would it be possible/advisable to use the same bit to cut through the plaster and lath (...
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19 views

Range Hood Ductwork, ceiling to roof offset issues

I'm installing a new chimney style hood, with a 6" exhaust that vents through the ceiling. The fan I'm replacing has an 8" pipe, which vents out of the roof of the house. The issue that I'm having is ...
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1answer
99 views

How can I prevent makeup air vents from exhausting conditioned air?

The utility room has two 8-10 inch ducts running to it from the exterior of the home. There are also three fireplaces in the home, and we have noticed that occasionally the house smells like smoke, ...
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2answers
48 views

How can I remove a mouse stuck in the air duct above a kitchen exhaust fan with built-in microwave?

Last night I heard noises in the cabinet above the microwave. There was nothing there but I heard squeaking and movement from the lower part of the metal air duct in the center of the cabinet. I am ...
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1answer
33 views

Flex-duct as a Trunk?

From my A/C supply plenum, I will have a trunk (approx 20ft straight run) with 3 branches coming off (each about 2 ft runs). This 20ft straight run would be perfect for a large flexible duct, and ...
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2answers
67 views

Side effects of wire mesh inside vent covers

I am considering tacking wire mesh (such as from a window screen) onto the inside of my indoor furnace/AC duct vents as well as the outdoor intake vents, for pest control. I know doing it inside the ...
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2answers
169 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 ...
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3answers
27k views

Can I cap the air return in my unfinished basement?

I noticed today that there is a massive air return in my unfinished basement. The opening is about 2 meters from the blower, and as large in diameter as the return duct coming from the upstairs. This ...
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0answers
42 views

CFM ratings of inline duct fans far exceed the ratings for their intended duct sizes. What are we to make of this when designing a system?

My garage is 25×29' with 10' ceilings, so 7250 cf. I'm hoping to be able to turn over the air every 3 minutes or so, so aiming at using 2 fans rated at a total of 2400cfm. The fans I'd like to use ...
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1answer
150 views

Is there a way to change the location of HVAC air filter location?

We bought the house recently. Heating system was recently installed by the previous home owner. I cannot believe they did not think of this but the place for filter is inside the furnace. The problem ...
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0answers
11 views

Replacing flexible.duct work on AC unit

I purchased the correct size flexible duct for the air supply, but was unaware that the return side is 2 inches bigger. Since I am unable to purchase the bigger size until next week, is it safe to run ...
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1answer
108 views

Bathroom fan duct connection for maintainability

There are many questions on here about installing duct work for bathroom fans, but I have a more specific question. I am planning to use rigid duct for a new bathroom fan where there was none ...
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2answers
284 views

Is there some type of coating I can use to prevent condensate on my HVAC ducts?

I'm getting a lot of condensate on my HVAC ducts that run though my first floor (and HVAC blower) especially in July / August when humidity levels are outrageous (in NJ). The 1st floor space space is ...
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2answers
56 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 ...
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4answers
1k views

Duct Cleaning: Is Duct Sealer Necessary, Non-Toxic?

A professional contractor is cleaning AC Ducts, and after he scrubs the ducts, he wants to apply an acrylic duct sealer and de-odorizer. The container of the duct sealer has minimal lableing and does ...
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1answer
74 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 ...
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4answers
23k views

How can I figure out why half my house is cold?

I just purchased my home a few months ago, and the AC was sub par during the summer. Now that winter is here, the house is extremely uncomfortable (cold). My furnace shoots hot air up to one main ...
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1answer
154 views

HVAC turning off below 30 degrees

A bit of a long post but I've tried to be as specific as possible I had a new Goodman HVAC put in Dec 2016 (model GPG1430060M41AB). For the last nine weeks the system has been cutting out when the ...
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2answers
97 views

Is there any reason that plumbing can't be adjacent to a heating/cooling duct?

I'm installing a utility sink and the only place to put the plumbing (if it's going to be right under the sink) is either directly behind or infront of this vent... Is there any reason not to put it ...
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2answers
100 views

Do my HVAC ducts need to hang away from floor joists?

I have a basement that I would like to finish and install a drywall ceiling. And I would like that ceiling to hide the HVAC vents. However, the vents already just (by an inch or so) go over my head. ...
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4answers
7k views

How to fill / seal in-slab hvac ductwork?

My house is built on a slab. Within the slab are "channels" which act as ducts for the HVAC system. I assume it is partially lined with metal but based on photos from an HVAC-cleaner, it's hard to ...
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0answers
15 views

Drafts coming from all floor Heating system ducts. Gaps between sheetmetal and floor have been sealed

I had my heating system, crawl space furnace and leaky poorly insulated sheet metal duct work, replaced a couple years ago with a 96% efficient system. The system was independently tested and ...
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5answers
9k views

Bathroom exhaust fan without duct

I just found out that our bathroom exhaust fan has no duct attached to it. Our current fan is Panasonic FV-08VQ2 (90 CFM, 4" duct diameter). The fan just blows the air to the inaccessible attic. There ...
2
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1answer
61 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, ...
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2answers
62 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 ...
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2answers
621 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 ...
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2answers
37 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 ...
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1answer
195 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, ...
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1answer
103 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 ...
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1answer
76 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?...
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2answers
54 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 ...
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2answers
81k views

Is 20 feet too long to run bathroom fan duct for 100cfm fan?

I need to run about 20 feet of duct to reach the gable, I don't want to go through the roof unless I absolutely need to, I live in Vermont and we can get a lot of snow build up on the roof, I also ...
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2answers
58 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. ...
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2answers
92 views

6" Ducting straight to in-wall rectangular ducting

I have a vent for the microwave-range that goes from an interior kitchen wall to the outside of the house. I need to re-locate this, but I can't move the exterior vent fixture. It currently comes in ...
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2answers
203 views

Can I connect my two HVAC systems?

My house has two HVAC systems. One is in the attic and has supply and returns in the ceiling of the second floor. The other is in the basement with supply and returns at the floor of the first floor. ...
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1answer
539 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 ...
3
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2answers
17k views

How to address loud cold air return

The cold air return on my forced air furnace is too loud. While it is is tolerable, there is a noticeable sound of rushing air when the furnace is running (not a whistling sound, just a blowing sound)....

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