airflow
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Thread: airflow

  1. #1
    Join Date
    Dec 2000
    Location
    Sudbury Ontario, Canada
    Posts
    155
    What do you do when you cannot get proper airflow for AC installations. In my location we have tight building construction with low cooling loads. If you notice furnace manufactures fan curves don't work well with 1 1/2 ton or 2 ton systems. Most of furnaces start around 900 cfm on low.
    What do you guys do with a siyuation like this? Or a belt drive system that is set for the proper air flow for heating?

  2. #2
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,225

    Exclamation Flow Control

    Originally posted by stevemc
    If you notice furnace manufactures fan curves don't work well with 1 1/2 ton or 2 ton systems. Most of furnaces start around 900 cfm on low.
    What's the dP @ 700 CFM on the fan curve?

    Use dampers and high efficiency filters to achieve lower ( slightly < 900) flow with furnace set on Low.
    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

  3. #3
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Increase the ESP,with better filters,and/or a damper(s),in the main supply and return.


    The higher ESP,should be able to get the airflow down to what you need,check your fan chart.

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