Questions tagged [ducts]

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23 views

How to add insulation to ducts in hot uninsulated attic?

I have central air with ducts running through the hot, uninsulated attic (there is blown-in insulation between the joists to insulate the rooms below). Fortunately it's only about 25 feet of ductwork, ...
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1answer
30 views

Using a bathroom fan with a smaller duct - is there a minimum size?

I am looking for information on how to properly replace a bathroom fan which is not working well enough (probably insufficient CFM). The bathroom fan I need to replace is a 90mm fan rated for 65m3/h (...
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0answers
32 views

Extending a forced air heat register

Adding a small room. Want to extend HVAC to the new room. HVAC guy warned me very expensive for such a small job and told me (wink wink nudge nudge) easy to do it myself. Attic above: Question: The ...
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1answer
46 views

Can I move air return higher?

I need to install some open shelving but the brackets they use are at a height that would interfere with the air return pictured. Would it be okay to relocate the return 4” higher or is there a reason ...
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1answer
40 views

Would a ducted heat pump lose a lot of effeciency if the ducts are installed in an open crawlspace?

Currently I use a woodstove to heat my place (no ducts). I am thinking about installing an air-to-air ducted heat pump to heat my place. I am trying to figure out what are the important factors (in ...
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1answer
30 views

How do i reduce and split hvac duct from 8" round into two rooms

Hi i have small minisplit with 350 cf/m i attached a plenum with 8 inch ridgit round duct attached to it now i need to run it into a bulkhead where one register goes into a small room aprox 12x12 ...
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1answer
28 views

Best way to insulate supply duct with minimal clearance

I wanted to wrap the supply side ductwork, but the return is mounted so close to it, in some spots barely 3/4 of an inch of space between them. What is the best way to insulate in this case? Supplies ...
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0answers
60 views

Duct work 'pushed' drywall from ceiling, can I jack it up?

Edited original question: Horizontal heating supply stack (4X15) runs between 2x8 joists under bathroom. The take off for the above bathroom register is located 4" from a rectangle to round ...
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1answer
47 views

Will this ductwork for my range hood work?

I installed a new exterior wall vent and ran 6" round galvanized steel duct work through my ceiling joists to the spot where our new range hood will be. There was a significant amount of PEX ...
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0answers
20 views

cold air return using resilient channel

I'm using resilient channel on a metal stud wall for sound reduction. The cold air return is in a wall that is not panned. The plan was drywall would enclose the area making it tight with airflow ...
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3answers
74 views

What type of duct should I use for a clothes dryer exhaust?

I am planning to relocate my gas dryer to the center of my basement. The closest vent is in one of the walls 16ft/5m away. To reach it I would need to run an exhaust pipe horizontally, enclosed in the ...
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1answer
35 views

How to fit a damper in duct?

I've seen some videos on how to fit a damper in a duct but his damper had only one spindle, requiring a single hole. The dampers in my local store, however, have two spindles, at 180 degrees, meaning ...
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1answer
30 views

How can I inspect 6" horizontal ducts to locate a rattle?

Something is rattling somewhere in a 6" round metal ceiling HVAC duct network, not near any vents. Maybe it's a loose damper. The ducts are now behind finished wallboard and since the airflow ...
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0answers
55 views

Ceiling Register Box Insulation and Airtightness - Is this correct?

I'm in the process of making all the ceiling punctures into my attic air tight and better insulated with caulk and spray foam to reduce moisture and my energy costs. However, the HVAC ceiling register ...
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2answers
23 views

New fiberglass batts near HVAC ducts

I have R19 fiberglass batts in my attic. There are large soft insulated HVAC ducts covering the batts in some places. I would like to put in new R30 on top of the R19. What is the proper way to ...
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4answers
163 views

How can I get my floor register to fit in the duct opening?

My duct opening is right next to the wall. I pulled out this old register to replace the baseboards but now I can’t fit it in the opening anymore. It seems like the existing duct gets in the way when ...
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2answers
107 views

Is this open supply duct in my vented crawl space necessary?

New (first-time) home owner here (4 months in). I recently discovered what at first seemed like an un/disconnected supply-side duct in our vented (open) crawl space. Photo attached. After several ...
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1answer
100 views

Mounting a projector underneath a soffit containing ductwork

I’m looking to install a projector in my basement and the most ideal configuration would be to mount it to the ceiling with a ceiling mount. However, the “sweet spot” location for hanging (in ...
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0answers
15 views

Improving HVAC post Remodel

We are living in a house that was originally built in the 80s with a gas furnace and forced air. Prior to our purchase, the house underwent a significant remodel including the addition of two rooms ...
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1answer
24 views

Should I clean my boiler room duct (ventilation)?

Our boiler room in our house is in our half above/half below ground basement. We have a new 100,000 BTU boiler that was installed last year. We also have a gas hot water heater next to it. In the ...
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3answers
84 views

How to properly permanently seal a duct opening?

I recently hired a handyman to install an over the range hood. To install it, he cut a hole in the bottom of the upper cabinets and routed the duct through the back of the cabinet's, into a vertical ...
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1answer
55 views

Is this black material in my HVAC air duct mold?

I live in an apartment complex in the southeastern United States. The apartment complex is made of brick so is probably fairly old, but my apartment was renovated just before I moved in. It has ...
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2answers
171 views

How can I join an exhaust vent and an existing duct that aren't aligned?

I'm replacing the over the range microwave in my house, and the new microwave's exhaust vent does not align with the existing ductwork and hole in the wall for the exhaust - neither vertically nor ...
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0answers
36 views

How to merge extractor fan ducting

I have an kitchen extractor hood that vents air through a 5-inch flexible ducting to a louvred cover in the outside wall. I'd like to add a similar piece of ducting to vent the tumble dryer outside, ...
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1answer
325 views

What could be the source of a tapping type sound coming from my upstairs air ducts? [duplicate]

We bought a new house a few months ago. I do not recall hearing this noise in the summer, when the AC was running, but then I wasn't in this room that much so I am not sure if it was happening. We ...
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2answers
47 views

Removing excess HVAC ductwork for efficiency

I have central ac in my home and at some point the kitchen was redone, blocking an existing vent permanently. The flex HVAC ductwork leading to the vent (probably 8 feet of it) is still there. Should ...
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2answers
91 views

Is there a way to easily split a wall register?

I have a small powder room that doesn't have a register/vent so it gets a bit cold compared to the rest of the house. I could install a new duct line split off from the main but there is a wall/floor ...
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2answers
112 views

How to air-seal apartment breaker box and range hood duct

I live in an apartment on the top floor. It's the dream apartment for me except for the heavy cooking smell from neighbors entering the unit. I believe the main culprit is the bathroom fan without ...
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1answer
107 views

Is lateral offset in 3.25x10 inch duct allowed?

I'm installing a microwave/range hood. To preserve usable depth in the cabinet above, I'd like to use 3.25 x 10 duct through the cabinet, and transition to round duct in the attic. However, a ...
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2answers
356 views

Is a bathroom required by code to have a window or exhaust fan?

The Fort Lauderdale, Florida unit is on the top floor and there is a duct for the unit's central air in the bathroom, but it doesn't have a window or exhaust fan. Is this not to code? What are my ...
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1answer
44 views

How to access OTR microwave exhaust vent/ducting

I currently have an OTR microwave that is externally vented The exhaust vent for the microwave is concealed by cabinets above the microwave, and inside the cabinets the ducting itself is concealed by ...
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0answers
28 views

Heat basement from excess heat in boiler room

I'm trying to heat a basement room using excess heat from the boiler room but it isn't working. I've run two 4 inch flex ducts from the boiler room to the main 300 square foot room at opposite ends. ...
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1answer
75 views

Will condensation form and be an issue on an aluminium duct venting water heater exhaust?

I have built the unfinished chimney shown in the image below to get the exhaust for my neighbor's water heaters (which I believe are sealed combustion gas appliances, such as the Remeha Avanta water ...
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0answers
32 views

How to safely bring a water heater exhaust above the roof line

Background A 5 story house in Rotterdam, the Netherlands, constructed in 1905 is divided into 4 units and each unit has its own gas water heater. The exhausts for these water heaters are aluminum ...
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1answer
89 views

How to connect a semi rigid aluminum duct to a rigid aluminum duct

In a 4 story multi-owner house in Rotterdam, the Netherlands there is an 80mm semi-rigid aluminum duct like the one shown in the image below which contains the water heater exhaust of my neighbors who ...
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1answer
51 views

Can I put a “U” turn in my range hood exhaust duct?

In the photo below The red arrow represents the direction of the exhaust, as you can see there is a load bearing joist in the middle which I can't cut. I'm planning to build a recessed ceiling on that ...
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0answers
65 views

Can I install a duct sleeve to eliminate HVAC leaking air between floors?

I have one 2nd floor bedroom that gets very little forced air A/C and heat. You barely feel the forced air coming out of the baseboard vent. I've already spent hours of running snake lines and a ...
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1answer
142 views

Ventilating a cat box through the dryer exhaust duct

I have a small closet that doubles as a laundry room, with a stacked washer and dryer. It's also where I keep my cat's litter box. It occurred to me that I could probably reduce the odor of the litter ...
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1answer
40 views

Rerouting return air duct in furdown

So I ran into this issue that seems quite gross that it was located inside the furdown in the bathroom, which was becoming layered in gross dust, hair and crap that gets sucked up. We removed it as ...
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2answers
239 views

Dryer vent through band joist between 1st and 2nd floor

My washer and dryer are located on the second floor of a two floor townhouse with crawlspace foundation. It's basically a closet that fits the two machines only, with very limited space front to back (...
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1answer
83 views

Can a single 8“ flex duct be split into a 5” flex and 7" flex?

Our house used to have a fur-down A/C unit that fed a series of rigid ducts made with duct board. We'd like to replace a vent in our bathroom (5' x 11') with a 5" flex duct. We'd like to ...
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1answer
104 views

Can I use 8" flex duct on a 7 inch rigid duct connection?

I am moving ducting three studs down, so I need to extend an insulated 7” flex pipe run that bridges a 7” elbow with a 7” floor register duct. 7” flex is hard to find locally but I have plenty of 8” ...
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0answers
95 views

replacing ductwork in a mobile home with round duct?

I know that most mobile homes use a single trunk duct that is 14" x 4" and all use a special furnace due to that size being used. , how easy is that to replace? I found out most of my duct ...
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2answers
47 views

How often should ducts / furnaces be cleaned?

Asking for a house with a dog located in Canada but any general answers would be welcomed.
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6answers
7k views

How do I fix this 30 ft (9 m) dryer vent abomination?

The previous owner left a bit of a headache with the dryer venting setup. Context: This is a gas dryer The living room is behind the right hand side wall, so that's a no-go as far as drilling The ...
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1answer
88 views

Sound proofing a panned floor joist return run (basement apartment)

I'm building a basement rental unit in our home. We'll be living upstairs so I'm doing my best to sound separate the upper and lower units. I'm using a seperate hvac system for the basement (baseboard ...
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0answers
21 views

Blank Wood Duct Caps (for closed off ducts in floor)

We had our crawl space forced air furnace with floor ducts (bad idea to put a furnace in a 3-4 foot crawl space) decommissioned and replaced with attic furnace with wall / ceiling ducts. Now we have ...
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1answer
84 views

Gas Combustion Air Duct Re-Route Considerations

What are the safety/legal considerations for safely re-routing gas combustion ducts? I have a two-story house with two gas combustion air ducts. The left duct serves a fireplace that is not in use and ...
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2answers
60 views

What are these lines called (on an air duct end) and how do you rebuild them if you cut the end of the duct?

I need to cut the end of the pipe and connect a 4" 90 elbow there How do you rebuild those ? In my case I am cutting short a ceiling pipe that ends like that and I need to connect there an elbow ...
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1answer
95 views

How can I route a 4" duct through a partition wall framed with 2x4s?

In the last picture I am moving a register (1) to (2). The left side of the picture shows where the 4" duct is sitting at the top of the wall (running across the joists). This is a bathroom. I ...

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