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  1. #1
    Join Date
    Oct 2007
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    Return Air Duct Design Static Pressure


    I am a residential HVAC consultant, selling replacements and add-ons directly to homeowners.

    I need some sage advice related to return air design theory / practice to make myself a better consultant.

    The training I have been given as it relates to the "Ductulator" is that I should be using a friction / ESP setting of .10 (for both supply and return) However, one of our more seasoned installers recently berated me for being a "wet behind the ears rookie" and then told me I should be using .05 friction when I design or verify the return side of the system.

    What say you?

    Help me out here-

  2. #2
    Join Date
    Aug 2002
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Post Likes
    Both numbers are rules of thumb,neither is correct,.05 is safer,but I would never use it.

    Get a copy of Manaul D from

    After a couple of reads ,come back here ,qualify fro Pro membership,and ask questions.

    Use the search function here to find more,but what you need is in the Pro section.

  3. #3
    Join Date
    Jan 2004
    Post Likes
    .1" is a joke. Bad rule of thumb. That is seldom correct.

    .05" is better, but still just a rule of thumb.

    The ductulator is to be used after you find the FR you need using Manual D.
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