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I need to run a 2 foot extension from a metal HVAC duct. The extension will go through a wall. What are the downsides of framing this extension with plasterboard rather than sheet metal?

  • Supply or return? – isherwood Nov 21 '17 at 23:23
  • @isherwood Supply. Why does that matter? – Yehuda_NYC Nov 22 '17 at 15:42
  • Because returns are commonly built using stud bays as ducts. Supplies typically require full metal lining. – isherwood Nov 22 '17 at 17:57
  • @isherwood Would that warm (moist) air blowing on that paper-faced wallboard cause mold? – Lee Sam Nov 23 '17 at 8:46
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It would be easier to put a piece of ductwork in than the drywall. You can always use flexible duct work.

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