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  1. #14
    well then...I guess I am right back where I started before I ever posted anything:confused

  2. #15
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,082
    All of the duct work the air travels through is part of the info needed to tell what the FR should be.
    Your return duct is carrying the air too. So it is part of the restriction to air flow, and has to be included.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  3. #16
    Join Date
    May 2007
    Location
    DC Metro Area (MD)
    Posts
    3,371
    http://www.acca.org/Files/?id=66 - some guidance in getting your ductwork system right in accordance to Manual D standards.

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