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  1. #1

    cfm for 2.25 X 12 rectangular duct

    I know there are a lot of variables but what would be a safe cfm number for 2.25 x 12" rectangular ductwork? will be fed by 6" insulated flex..thanx

  2. #2
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,509
    approx 80 to 100 cfm depemding on lenth amd delivery from main trunk

  3. #3
    perfect, thanks!

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