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  1. #1
    Join Date
    Oct 2019
    Posts
    1
    Post Likes

    Ductwork sizing.

    I have a Goodman heat pump GPH1448M41AB (nominal cooling cfm 1600) installed and I am running all new ductwork under a mobile home. The return air is 16" and runs approx 36'. The supply side has not been run yet, but it will be approx 2 runs of 50' with a branch joining the two runs. I have 9-4x8 vents which can be enlarged. My question is, What is the smallest supply duct I can run? I was going to run 14" but limited headroom wont allow that past the first 30'. I have no idea what I am doing, I need to get it as close to right the first time. Thank you for your advice. I'm just a homeowner trying to get by.

  2. #2
    Join Date
    Jan 2012
    Location
    Missouri, USA
    Posts
    1,499
    Post Likes
    You may not have noticed the big red letters that read NO DIY. This site is not for diy. Good luck.

  3. #3
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    25,585
    Post Likes
    You need a Manual D run!

  4. #4
    Join Date
    Feb 2014
    Location
    Phoenix Arizona
    Posts
    975
    Post Likes
    There always seems to be enough money to have it done right the second time...

  5. #5
    Join Date
    Jan 2004
    Location
    PA
    Posts
    78,318
    Post Likes
    Sorry, this is not a DIY site.

    Thread closed.
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