Questions tagged [ducts]
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Advice on over range microwave venting duct
We are replacing an old hood with an over range microwave where the circular vent hole is dead center in the cabinet above. The microwave we just purchased has the designated hole towards the back and ...
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Air exchanger "fresh air to house" wye - should I leave it open or closed?
Background
Just bought a house with a passive air exchanger: no internal fans, just motorized dampers moving air with the furnace fan. We have a thermopump, electric furnace and whole house bypass ...
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Can the exhaust duct of an ERV vent *into* the garage?
I am looking to install an ERV in my house and am currently trying to determine good locations for the intake and exhaust vents. While I have identified other candidate locations for the exhaust vent, ...
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How to abandon under slab ductwork?
Our sub-slab ductwork (sonotube and sheet metal, no transite) is in terrible condition, so were switching to mini splits. We need to figure out how to safely and effectively abandon the current system,...
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Basement wall framing - Attaching top plate with pipes in the way
I'm laying out framing for a basement wall and currently stuck on how to attach the top track.
The problem is there is a good sized heat pipe running parallel between two joists (the other ductwork I'...
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Mini Split with Central AC
Is it possible/efficient to have One mini split unit in the living room and remove all the ducts in that room to then have the central AC only cool bedrooms?
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OTR Microwave vent through wall, but on bottom?
I was replacing my over-the-range microwave and discovered the location of the existing vent. The vent is straight out the exterior wall, but down towards the bottom mounting bracket… I can’t seem to ...
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How should I connect flexible plastic duct to a metal duct?
I have an insulated duct like this: https://www.homedepot.com/p/Master-Flow-4-in-x-12-ft-Insulated-Flexible-Duct-R6-Silver-Jacket-F6IFD4X144/203420974
The actual tube inside is some kind of plastic. ...
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A/C vent not connected to duct?
So I am in the process of doing a light reno to a bathroom in my 1954 ranch style home and I took off the a/c vent to wash it and/or buy a new one. To my surprise (okay not really surprise— there was ...
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Is it worth completely changing “acceptable” bath vent ducting to avoid reducing from 4” fan to 3” ducting? [closed]
I’m upgrading two adjacent small bathrooms with new exhaust fans. The existing ducts are 3” plastic/flexible. The builder has both 3” ducts terminating, side by side, out of a 5or6” roof vent. The new ...
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Can I reduce the size of my range hood duct without performance impact?
I'm installing a Zephyr Monsoon I (600 CFM) which has an 8" duct. The wall cap is 7" and instead of replacing the cap, I'm thinking of adding a reducer just before the wall cap from 8" ...
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How to clean cat pee out out of floor registers/ducts?
We had an elderly cat with kidney issues who would sometimes pee in the floor registers. House has one level with a basement.
Sadly he has passed on, but now at least we can clean things up without ...
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What do to with this vent?
I was in the shower yesterday and said "Oh no, a loose tile!". 5 hours after the shower, I'm here, as the tile was not just "loose" but water had gotten all into the wall and was ...
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Duct connector for bathroom fan doesn't fit in the attic space. What are my options?
I am in the process of removing an old bathroom fan and replacing it with a newer Broan-Nutone fan. The new fan came with a 4" duct connector, which will require a connector to attach to my 3&...
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How would I fix this vent sides that are bending inward?
I have a vent with side walls that are bending inward, preventing the vent cover from sitting in the duct properly (it currently just sits on top of the bent portions). I can push the bent portions ...
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Furnace Return in basement
I have a duplex and one furnace crapped out likely because it had the return in the basement. It’s upstate NY, so it gets cold.
If I want it done 100% right. I need ducts run all the way to the top ...
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Whole house dehumidifier with no central air?
I moved into my home in the winter of last year after the house had been vacant for 1 - 2 years. In the summer during bouts of rain for 2 - 3 days, humidity levels in the house increase dramatically. ...
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Help understanding half-built ductwork
I'm trying to understand a new ductwork system that was half-built and then abandoned. It was built with a cold-weather heatpump and possibly an ERV in mind. It has four supply lines fully ducted ...
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Sealing opening from removed ductwork
I have a 1956 house near Los Angeles.
We replaced the whole HVAC system 6 years ago, including ductwork. The contractor removed all the old ducts, but we still have all the old wall registers. They ...
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Panasonic Bath fan options and venting question
I'd like to add two bath fans to our house. This sub has let me know that Panasonic are probably the best. But I figured I'd ask here about the venting and lighting options. I have good access to ...
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My new AC is under performing and guzzling too much juice, can anyone help?
My company mainly focuses on small refrigeration units and walk-ins. Although we do offer service and/or Replacements on air conditioning systems, it’s only 1/3rd of the whole show so, I’d be a liar ...
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Can I reconfigure two 5" ducts into a single line & what size should they be?
I am trying to move a floor register location. Currently I have two 5" HVAC ducts being fed from a 6" x 10" rectangular trunk. The one 5" run has the register in the middle of ...
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I need clarification on specs for installing a second AC filter and box
I'm wanting add a second intake in my house. The filter will be a 12x12 so my question is. How far can I put the new filter from the blower? Is there a code regulation?
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HVAC question about Evaporator Coil repair
My evaporator coil was recently replaced (Carrier CNPHP6024ALAAAAA replaced with a bigger unit, CVPMA6124XMC). They sealed around the edges with tape. The original install was sealed with some kind of ...
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Is a tear in outer foil of ac duct an issue?
I just noticed a tear in the main duct that goes from the air handler into the ceiling to feed the rest of the duct work.
The tear is in the foil only and I cannot feel any air escaping from it, it ...
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Is it ok to run dryer duct under an electrical panel?
My current dryer vent is preventing me from enclosing my back porch.
I have a basement window I can use to vent the dryer, but it's on the other side of my electrical panel. Is it ok to run the ...
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Fix the noise this damper is making
I recently moved to a new house and the damper in the HVAC air duct is making this very loud noise. I think it is loose and flapping around as air passes through it. I tried to tape the handle, but ...
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Sealing ducts myself
I have a furnace with AC in the basement. I have poor airflow in my top floor vents (furthest from the furnace). and even the room with the cold air return doesn't change temperature very quickly. ...
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Ducted vent hood installation - taping up open penetrations
I was thinking of installing a ducted range hood in my home but there seems to be a lot of things to watch out for.
I was watching this Youtube tutorial and one comment about "covering up open ...
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Should I replace this dryer vent duct w/ semi-rigid or rigid metal?
I'm a new home owner, and have been trying to look for ways to keep my house in fighting shape. Going down the rabbit hole I learned, some types of dryer vent ducts are very flammable. This prompted ...
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From heat load to CFM and where does 400/ton come from?
Based on this answer I have finally calculated my heating load of the total house as well as the distribution for individual ducts (rooms). Note that the formula for the heat loads was:
BTH/h = ∆T * ...
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Fixing existing substandard ductwork to improve flow & increase basement ceiling height
I'm doing a basement development. Before I build bulkheads and close up the ceiling, I want to fix a few things about the ductwork.
As I understand it, you shouldn't have supply ducts coming right ...
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How to do heat load calculations for distribution with common return and/or open floor concept
Many calculators (example) can obtain heating load or the whole house or of a single room with room based on area, room height and other factors (windows, insulation etc).
My 1927 home has existing ...
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Should my air conditioner be running its air directly through internal spaces?
Should a newly installed “ducted” split system be running its intake air directly through internal spaces, or should I demand that the system be sealed so that it only draws air from living spaces?
I’...
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Help identify MDF box with duct [closed]
Previous owners of my house left some sort of MDF box with a duct. There is insulation inside along with aluminum tape. There's some caulking around the duct and it looks like the box is broken up ...
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Is it ok to connect air conditioner from one room to another using duct and exhaust fan
I have two rooms both has the area of 100 sq.ft and together 200 sq.ft.
According to AC tonnage calculation , 1.5 TON AC is enough upto 90 to 250 sq.ft area.
Sine I have 1.5 Ton AC , I'm thinking to ...
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California: what happens if HVAC fails HERS? [closed]
In California, I recently had my AC and furnace replaced and am getting a Home Energy Rating System (HERS) test done as part of the permit paperwork.
The contractor did not make modifications to my ...
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How to close large uneven gap between heater duct and concrete block
There is a heater on the other side of the wall. From that heater a duct goes into crawlspace under the house (pictured below). There is quite a gap, which mice/rats have been using to enter/lease the ...
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Can I remove this blocking in stud bays for a cold air return duct?
I've been troubleshooting a second floor cold air return that doesn't actually go anywhere. 1928 house, where 2nd floor was finished many years ago by other owners.
I'm replacing the floor so decided ...
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Duct filter damper
I have a couple active powered air filters hooked up on my ductwork. They are rated for 625 CFM at 0.5" W.C.
The ductwork is only used for AC, for heat there is a boiler and baseboard radiators.
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Does transitioning a bathroom fan duct diameter work even if the fan's outlet is the smaller dimension?
According to numerous charts online, I would need an 80 CFM bathroom fan to exhaust via a 6" round rigid duct in order for my planned long length run to work properly. If the exhaust outlet of a ...
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HVAC Ducting - Replace during renovation?
We recently bought a new (to us, built in '52) house that has A/C and a furnace. Great. The air distribution isn't... ideal - much colder in the bedroom than other parts of the house. For the time ...
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What sort of contractor retrofits kitchen exhaust ducts in the US?
I am new to the US and my wife and I are currently thinking about remodeling the 35-ish year old kitchen of the small house we purchased. Part of that remodel is replacing, if possible, the existing ...
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Questions on installing a bathroom exhaust fan [closed]
I am in the process of installing a new bathroom exhaust fan (Panasonic FV-0511VKL2). I had a few questions (my apologies if they are trivial or obvious but its my first time doing something by myself)...
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New 1500 watt (rated) dust extractor power consumption. Bad unit?
I asked this in the electronic section and been recommended to take it here instead. I've come to this site to ask some advice. I recently bought a 2 HP (1500 watt) workshop cyclone dust extractor, ...
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Take offs on a new trunk line
I recently had all new duct work put under the house because the old was severely undersized, (8x14) rectangular duct 50’ long with 17 take offs) with a 4 ton unit.
My question is the placement of ...
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Reduce light and sound from adjacent rooms sharing air return vents
My two bedrooms upstairs share a wall space for an air return. The wall has an upper and lower return vent. You are able to see directly into the adjacent room from the vents. Is there anything that ...
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Reduced ducted air flow with heat pump
This post is part of the research I did before installing a heat pump recently, which may help add context: Gas furnace switch to heat pump installation?
The heat pump I got installed is ...
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Do I need to add a return in one of my bedrooms
My house was built in the 70s and the master bedroom has 2 supplies but no return. The other two bedrooms, which are smaller, each have 1 supply and 1 return.
The bathroom right next to the master ...
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Best way to move this dryer vent hookup?
I am adding a sink to my laundry room on the right hand side of my dryer. The washing machine and related plumbing is on the left hand side of the dryer, so in order to tap off the drain for the new ...
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