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Questions tagged [ducts]

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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 ...
feetwet's user avatar
  • 2,647
1 vote
0 answers
610 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 ...
SBerg413's user avatar
  • 549
1 vote
2 answers
464 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 ...
have_beard_will_ski's user avatar
1 vote
4 answers
8k 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 ...
user avatar
3 votes
2 answers
3k 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 ...
rokmeamadeus's user avatar
1 vote
1 answer
719 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 ...
littleK's user avatar
  • 197
1 vote
0 answers
25 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 ...
SaunaBuilder's user avatar
0 votes
1 answer
165 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 ...
nnamerz's user avatar
  • 313
-1 votes
3 answers
3k 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 ...
you786's user avatar
  • 117
0 votes
1 answer
2k 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 ...
Logan Kirkland's user avatar
0 votes
2 answers
9k 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 ...
you786's user avatar
  • 117
1 vote
0 answers
371 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, ...
ConanTheGerbil's user avatar
1 vote
1 answer
10k 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 ...
IMTheNachoMan's user avatar
1 vote
2 answers
1k 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 ...
Pinch's user avatar
  • 113
2 votes
2 answers
4k 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 ...
redlude97's user avatar
  • 1,695
1 vote
2 answers
774 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 ...
bariscc's user avatar
  • 13
0 votes
1 answer
2k 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 ...
zwiebelspaetzle's user avatar
1 vote
2 answers
4k 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 ...
Apav's user avatar
  • 11
-1 votes
1 answer
391 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 ...
theasianpianist's user avatar
0 votes
0 answers
188 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. ...
Joe Bienkowski's user avatar
0 votes
1 answer
413 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 ...
Eric's user avatar
  • 185
2 votes
1 answer
4k 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 ...
Eric's user avatar
  • 185
1 vote
1 answer
310 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 ...
Guj Mil's user avatar
  • 194
1 vote
1 answer
1k 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 ...
rgov's user avatar
  • 121
0 votes
1 answer
268 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 ...
Karen Morgan's user avatar
1 vote
2 answers
3k 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 (...
achao's user avatar
  • 379
0 votes
1 answer
787 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 ...
Jason Anderson's user avatar
1 vote
1 answer
2k 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” ...
David's user avatar
  • 1,057
1 vote
2 answers
79 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.
Viv's user avatar
  • 147
32 votes
6 answers
11k 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 ...
Albert's user avatar
  • 331
-1 votes
1 answer
298 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 ...
Evan's user avatar
  • 1
0 votes
0 answers
67 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 ...
Bill N's user avatar
  • 1
3 votes
1 answer
243 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 ...
JJ Zabkar's user avatar
  • 246
0 votes
2 answers
398 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 ...
MiniMe's user avatar
  • 3,422
1 vote
1 answer
2k 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 ...
MiniMe's user avatar
  • 3,422
0 votes
0 answers
919 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 ...
MiniMe's user avatar
  • 3,422
0 votes
0 answers
57 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 ...
ejb's user avatar
  • 121
2 votes
1 answer
419 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 ...
mikeLdub's user avatar
  • 379
1 vote
1 answer
279 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 ...
DKNguyen's user avatar
  • 370
-2 votes
1 answer
405 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 ...
nightslugs's user avatar
3 votes
0 answers
277 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 ...
a3c's user avatar
  • 31
0 votes
0 answers
2k 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 ...
David's user avatar
  • 1,057
4 votes
1 answer
145 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 ...
w_mark_c's user avatar
0 votes
1 answer
81 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 ...
eddie E's user avatar
2 votes
1 answer
195 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 ...
Insu Q's user avatar
  • 123
1 vote
0 answers
134 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 ...
Antonio Andrés's user avatar
7 votes
2 answers
314 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 ...
Tyler M's user avatar
  • 1,070
3 votes
1 answer
117 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 (...
user278411's user avatar
0 votes
2 answers
10k 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 ...
aaandre's user avatar
  • 113
0 votes
1 answer
4k 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 ...
Tyler M's user avatar
  • 1,070

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