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PostPosted: Tue Dec 22, 2020 4:05 am 
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this will work - consider also duct liner around the bottom edge (top of the inner ceiling drywall) like a gasket then caulking. the small gap between MDF and drywall once sealed should be fine. the wrapping the air path like shown will help decouple as opposed to simply having a hard box attached.

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PostPosted: Tue Dec 22, 2020 5:34 am 
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Ok, that's good info. I'll draw up the updated design with real dimensions and post for further review. Getting closer!


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PostPosted: Tue Dec 22, 2020 10:10 am 
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Since I have a long run to work with, I though I'd try a 2 box duct, one one each left. The left side is attached to the outer leaf (joists), the right box is decoupled. Small duct between them is decoupled from the outer box. Thoughts on this design?

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PostPosted: Sat Dec 26, 2020 2:19 am 
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i'm assuming the connecting tube between them is the wall boundary between rooms? example from a previous studio build: top unit is silencer from outside, through sealed penetration spaces, into in-room plenum.
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PostPosted: Sat Dec 26, 2020 3:10 pm 
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No, they are both in the joist cavity above the room. I can't do anything outside the room as the main furnace trunk runs along the ceiling outside the room, and that is a rec room space (untouchable space-wise).

This is the overall layout:

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basement top 3d-2.jpg


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PostPosted: Sun Dec 27, 2020 3:23 am 
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ok that looks like it should work

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