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Thread: duct rating

  1. #1
    Join Date
    Aug 2008
    Posts
    21

    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
    Location
    Lancaster PA
    Posts
    67,741
    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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