Labels:car | hakham | windowpane OCR: Understanding the UL Fire Resistance Directories What does J mean to SEY that particutar wall or ceiling system has achieved 1-hour fire rating? The term hour fire-rated system" generally used to refer to system that has been shown in carefully controlled laboratory test tto be capable of limiting the transmission of high temperatures specified maximum, and to meet other requirements for at least 60 minutes (ASTM E119 Prev Next particular
