727 Series - Temperature Rise Standard Features Temperature Rise Rated (250˚F) Insulated 1-3/4 Inches Thick 12 Gauge Top Channel 16 Gauge Bottom Channel Mineral Fire Door Core 18 or 16 Gauge Face Skins Fire Rated up to 3 Hours Sizes from 2068 to 4080 Rugged Perimeter Channel Construction For more detailed information, please see the link below. Find technical information here >>