Understanding the UL Fire Resistance Directories - Ron Blank ...
Understanding the UL Fire Resistance Directories - Ron Blank ...
Understanding the UL Fire Resistance Directories - Ron Blank ...
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<strong>Understanding</strong> <strong>UL</strong>What does it mean to say that a particular wall orceiling system has achieved a 1-hour fire rating?Q.What does it mean to say that a particular wallor ceiling system has achieved a 1-hour firerating?A.It passes ASTM E119 for at least 60 minutes.