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Thread: duct rating

  1. #1
    Join Date
    Aug 2008
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    duct rating

    Hi, can someone please tell me what the
    "R" rating is on the old galvanized duct? Also, this duct is insulated with insulation.

    Is R8 really better than the normal R 4.2?

  2. #2
    Join Date
    Jan 2004
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    Metal duct doesn't have a R rating.
    Its the liner/insulation that has the R value. And it depends how thick and it is.

    R8 transfers heat only have as fast as R4.
    So yes, it is better.
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