Fire dampers in Exhaust Duct
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  1. #1
    Join Date
    Dec 2008
    Location
    New York
    Posts
    5

    Fire dampers in Exhaust Duct

    Just wondering if anyone remembers when the code changed dissallowing fire dampers in Non UL listed ducts and duct systems.

  2. #2
    Join Date
    Mar 2007
    Location
    Regina SK Canada
    Posts
    20
    It was in the atter part of the 90's. fire hazard as the dampers would collect grease and not close

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