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  1. #1
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    Air Flow Data Chart

    Attached is a Nordyen B6 air handler air flow data chart.
    42/48 B-Cabinet with a wet coil, low speed, .3 ESP.
    What is my CFM?
    air flow data.pdf

  2. #2
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    Quote Originally Posted by rickboggs View Post
    Attached is a Nordyen B6 air handler air flow data chart.
    42/48 B-Cabinet with a wet coil, low speed, .3 ESP.
    What is my CFM?
    The way I read it is........

    With no filter and dry coil, a measured 0.3 wc would be 1271 cfm.

    You would then have to assume (based on the note at the bottom of the chart), with a wet coil and filter, your ESP would be 0.17 wc higher or 0.47 wc (0.30 + 0.17). This would result in less airflow, or about 1200 cfm.

    If you measured 0.30 wc with a wet coil and filter, you should have 1271 cfm, but knowing when the coil is dry, the airflow will be higher, because the ESP will be 0.17 wc lower, or about 1317 cfm.

    Is this just an example, or do you really have a system with 0.30 wc TESP?
    Instead of learning the tricks of the trade, learn the trade.

  3. #3
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    Thread Starter
    Thank you Rundawg.
    It's just an example. It's part of our start up procedure to know the ESP and set the cfm accordingly. This chart seems to have you set the cfm with a dry coil then use the correction for wet coil cfm.

    We had a talk in the office about this air flow data chart, we (not me, I mainly listened) decided we can't know the cfm if the coil is wet unless the ESP is .2 or below in med or high speed. Otherwise the coil needs to be dry and use the correction.

    Thank you again Rundawg,
    Rick Boggs
    Last edited by rickboggs; 07-12-2017 at 06:15 AM. Reason: Thought I was brainstorming, it was a low pressure system

  4. #4
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    There is no substitute for a pitot traverse of the duct.

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