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  1. #1
    Join Date
    Jul 2018
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    How accurate are coil pressure drop to CFM charts?

    How accurate are coil pressure drop to CFM charts?

    Excluding flowhoods or paying an independent system balancer, what is the most accurate method a tech can use to measure actual CFM in a residential application?

  2. #2
    Join Date
    Oct 2014
    Location
    Saint Pail, Minnesota
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    Measure static pressure with a manometer and match with mfg chart. They are put in manuals for a reason, they did all the math for you, it’s their product.
    UA Proud Local 539

    You can fix anything with the right amount of time and money.

  3. #3
    Join Date
    Aug 2002
    Location
    Southold, NY
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    Quote Originally Posted by Pnasty View Post
    Measure static pressure with a manometer and match with mfg chart. They are put in manuals for a reason, they did all the math for you, it’s their product.
    Thats too easy!

  4. Likes Pnasty liked this post
  5. #4
    Join Date
    Oct 2014
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    Quote Originally Posted by pecmsg View Post
    Thats too easy!
    Get it the balancing hood then
    UA Proud Local 539

    You can fix anything with the right amount of time and money.

  6. #5
    Join Date
    Jul 2018
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    Thread Starter
    So then accurate?

    Would you set a fan speed off of it if alone?

  7. #6
    Join Date
    Jun 2014
    Location
    Dover, DE
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    They are pretty close most of the time. Depending on how accurate your manometer is.
    I havent failed. Ive just found 10,000 ways that wont work. - Thomas Edison

    Its not whether you get knocked down, its whether you get up. - Vince Lombardi

    "In this house we obey the laws of thermodynamics" - Homer Simpson

  8. #7
    Join Date
    Dec 2014
    Location
    midwest
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    Coil and furnace have to be shiny new for blower curve to work.

    Sent from my SM-G930V using Tapatalk

  9. #8
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
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    Use a Vane ANEMOMETER in a Professional way.

    https://www.extrememeters.com/collec...list=grid-view
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

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