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  1. #1
    Join Date
    Jun 2010
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    Duct Transition on Plenum

    I am working on an install of a 2 ton A/C with a upflow furnace. The top furnace opening is 12" x 18". But the coils are 12" x 23". The start of my main trunk is 12" x 18". Can I transition the plenum right off the coils to a 12" x 18" over the 5" area that's dead air? Or will doing that cause me have air restriction?

    Here's my plan: I would like to transition the plenum from 12 x 23 right off the coils back to a 12 x 18 and rise 34" and 90 into the attic where it will meet the main trunk which is 12 x 18. I am afraid if I leave the plenum at 12 x 23 and make the transition to 12 x 18 after the 90 that I will lose a lot of air velocity. Should I make that transition off the coils?

  2. #2
    Join Date
    Jan 2004
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    Li5iD, this is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise, ask questions or make commentary in other peoples threads. Please apply to the AOPC today, thank you.

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