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Discussion Starter #1
Hello,

I know very little about HVAC and duct work so i appologize in advanced for my ignorance.

In one of the walls in my house there is a metal duct with insultaion wrapped around it that measures about 24 inches wide x 12 inches deep.

It runs from the basement to a second floor vent in the ceiling that does not blow out any cold air when the central AC is turned on.

I have 2 questions:

1. What kind of duct is this?

2. I would like to build a recessed shelve in the 1st floor wall, and the duct is right up against the wall. I would like the re-route the duct several inchest back in the wall (yes the wall is deeper than the duct) so i can build the recessed shelve. Any suggestions on how this could be done?

Thank you,

John
 

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does the furnace have return duct connected to it on the side when your standing in front of it....with the supply duct on top of the furnace?where does your filter go on the for furnace?if you have no return duct work raw uninsulated back to the furnace and the filter mounts on the furnace access panel that is your return...so that duct drop is the return from the 2nd floor if it isn't in close proxsimity to the filtered return you might consider ectending it. lets hear what you have there:huh:
 

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Discussion Starter #3
On the top of the furnice i believe is the supply duct for the rooms b/c going into the duct coming out of the top of the furnice are refrigerant filled lines

does this help any?
 

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Discussion Starter #4
ok,

the top of the furnace is the air supply for the rooms, the filter is in the front of the furnace

on the bottom of the furnace on the side is where that large 24 x 12 inch duct comes out of.
 

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if you have duct woork going into the lower side ofthef furnace that is your return but your saying the filter is on the front also...follow the uninsulated duct from the side of the unit that duct might have to be connected to it to pull the 2nd floor..is there awallgrill on the first floor near the stat and a grill on the second floor?
 

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Discussion Starter #6
yes there is.

but all i'm interested in doing is re-routing the duct in the wall on the 1st floor.

I want to move it back about 1 foot so i can build a recessed shelve b/c right now the duct is in the way.

since the return duct is 24 x 12 inches, would it significantly compromise the system if i cut out a 5 foot section and run a duct with a smaller cross section for that 5 foot run so i would have enough room to creat my recessed shelve?
 

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yes there is.

but all i'm interested in doing is re-routing the duct in the wall on the 1st floor.

I want to move it back about 1 foot so i can build a recessed shelve b/c right now the duct is in the way.

since the return duct is 24 x 12 inches, would it significantly compromise the system if i cut out a 5 foot section and run a duct with a smaller cross section for that 5 foot run so i would have enough room to creat my recessed shelve?
Yes it would compromise the system unless already very oversized.
 

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Yep, it would hurt the system performance.
Probably would notice your second floor not cooling well anymore.
In reality, it should be made bigger to make the offset. And probably vanned.
 
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