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Old 03-21-2012, 12:30 PM   #16
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How to extend HVAC ceiling vent through new soffit?


That sounds perfect, did you bend a flange out at bottom (back side of drywall) so you can attach grille ? don't forget insulation wrap.

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Old 03-21-2012, 12:33 PM   #17
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How to extend HVAC ceiling vent through new soffit?


Bingo, that's exactly what I was thinking of making....sounds like your way is the way to go. Pics would be great
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Old 03-21-2012, 12:41 PM   #18
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How to extend HVAC ceiling vent through new soffit?


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That sounds perfect, did you bend a flange out at bottom (back side of drywall) so you can attach grille ? don't forget insulation wrap.
Yup, I bent a "flange" at the bottom, and test fitted a grille I purchased so it fits snug.

What do I need insulation wrap for, the duct? Considering my main trunk isn't insulated, is it necessary?

I'll post pictures later.
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Old 03-21-2012, 12:45 PM   #19
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How to extend HVAC ceiling vent through new soffit?


I'm in south florida, we insulate everything. Is this a heating duct ?
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Old 03-21-2012, 12:54 PM   #20
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How to extend HVAC ceiling vent through new soffit?


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I'm in south florida, we insulate everything. Is this a heating duct ?
I'm in Virginia.. It's a heating/cooling trunk/duct. Seeing as how the main trunk isn't/wasn't insulated to begin with, and will be in a soffit of a finished room, is it even necessary to insulate it?
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Old 03-21-2012, 01:07 PM   #21
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How to extend HVAC ceiling vent through new soffit?


interesting, I would like to know the leaving air temp at unit, compared to air temp coming from vent.
Also anytime you have a cold duct in a enclosed space (non conditioned space) you normally will get condensation off duct. Is it lined ? (insulated on inside) Can you see existing duct in crawl space, do you see any signs of condensate on duct or water stains on ceiling below duct ?
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Old 03-21-2012, 01:13 PM   #22
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How to extend HVAC ceiling vent through new soffit?


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interesting, I would like to know the leaving air temp at unit, compared to air temp coming from vent.
Also anytime you have a cold duct in a enclosed space (non conditioned space) you normally will get condensation off duct. Is it lined ? (insulated on inside) Can you see existing duct in crawl space, do you see any signs of condensate on duct or water stains on ceiling below duct ?
I'm not sure I'd call it a "non conditioned" space, as it's a soffit/duct running through a conditioned space. If it was a non-conditioned space I'd definitely insulate it, but I'm not sure it's necessary being in a conditioned space..?
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Old 03-21-2012, 01:18 PM   #23
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How to extend HVAC ceiling vent through new soffit?


How is the return aire getting back to unit from, where you extending the duct ?
I'm not trying to give you a hard time, just do not want you to have issue's down the road after all your work.
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Old 03-21-2012, 01:22 PM   #24
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How to extend HVAC ceiling vent through new soffit?


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How is the return aire getting back to unit from, where you extending the duct ?
I'm not trying to give you a hard time, just do not want you to have issue's down the road after all your work.
Ggold, sorry, I'm really not sure what you're asking..? Here's the "register" I made/moved on the trunk that I was referring to, that has been frame around, and will be drywalled (soffit). I'll post a better picture later of the actual "take off register" I made.
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Old 03-21-2012, 01:31 PM   #25
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How to extend HVAC ceiling vent through new soffit?


When you drywall that, it will be considered non conditioned space. The ceiling beyond I notice is insulated. How does the air get back to your return air grille ?
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Old 03-21-2012, 01:37 PM   #26
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How to extend HVAC ceiling vent through new soffit?


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When you drywall that, it will be considered non conditioned space. The ceiling beyond I notice is insulated. How does the air get back to your return air grille ?
There is a return air grille in that open living area. The ceiling is only insulated for noise dampening, as this is a walk out basement. I've asked a few folks and they say insulating the trunk is not necessary..? It seems like insulating it wouldn't hurt, but not sure it'll make a difference.
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Old 03-21-2012, 07:45 PM   #27
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How to extend HVAC ceiling vent through new soffit?


Cool, that exactly what I'm looking for. I went to the depot and could only find a 10x4 premade rectangle. Curious where you got yours.
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Originally Posted by NewHomeDIYGuy View Post
Here's the "register" I made/moved on the trunk that I was referring to, that has been frame around, and will be drywalled (soffit). I'll post a better picture later of the actual "take off register" I made.
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Old 03-21-2012, 09:02 PM   #28
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How to extend HVAC ceiling vent through new soffit?


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Cool, that exactly what I'm looking for. I went to the depot and could only find a 10x4 premade rectangle. Curious where you got yours.
This is the exact piece I bought: http://www.homedepot.com/h_d1/N-25ec...atalogId=10053

I basically just cut it down shorter, and made the "flange" on one end. I called around to hvac/sheetmetal shops, and came to the realization I was gonna have no luck, and something so small was gonna be a DIY ghetto rigging job.

Here are the pictures I just snapped.
Attached Thumbnails
How to extend HVAC ceiling vent through new soffit?-20120321_214838.jpg   How to extend HVAC ceiling vent through new soffit?-20120321_214852.jpg   How to extend HVAC ceiling vent through new soffit?-20120321_214917.jpg  
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Old 03-21-2012, 09:07 PM   #29
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How to extend HVAC ceiling vent through new soffit?


I'm confused, is that something you installed or removed? Every single square inch of that metal should be insulated and most trunk lines are insulated internally.

What happens when there is no insulation is the cold dry air from the a/c meets the warmer humid air of the room and bam, condensation, water dripping from the duct onto your sheetrock. It happens all the time down here.

If you haven't already done so, I'd strongly suggest you nip this in the bud before you go any further, while everything is accessible.
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Old 03-21-2012, 09:24 PM   #30
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How to extend HVAC ceiling vent through new soffit?


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Originally Posted by Doc Holliday View Post
I'm confused, is that something you installed or removed? Every single square inch of that metal should be insulated and most trunk lines are insulated internally.

What happens when there is no insulation is the cold dry air from the a/c meets the warmer humid air of the room and bam, condensation, water dripping from the duct onto your sheetrock. It happens all the time down here.

If you haven't already done so, I'd strongly suggest you nip this in the bud before you go any further, while everything is accessible.
Doc,

I installed the framing/soffit around the trunk. The basement had a partial soffit (done by the previous owner by the looks of it half assed), but I'm finishing more of the basement/refinishing parts of it, and I'm extending the soffit from one end of the room all the way to the other. If you look at the picture, you can see where the old wall stopped for the living area on the far wall (where the drywall stops on the left). The wall was L shaped and ran in front of the steel beam (as you're looking at it), and to the hallway. I knocked out the L shaped wall and pushed it back to give more room to the living room, and less to the wash room. Hope that makes sense.

I've had a contractor tell me it's "ok" to leave it non-insulated, but you're saying that I'm going to get condensation from the duct? *sigh* Big surprise I guess.. If that's the case, then I certainly will look into insulating it. Any recommendations on what to use? Here's a better picture of the soffit from the other side. It runs almost the entire length of the steel beam. Thanks for the help.
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Last edited by NewHomeDIYGuy; 03-21-2012 at 09:28 PM.
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