Glass produced by the fire with fire incident, a fixed, flat-opening, push-pull; Any wood, steel, stainless steel frames and other means of fire for grades 30 minutes, 45 minutes, 60 minutes, 90 minutes, 120 minutes, or 36 minutes, 54 minutes, 72 minutes and 140 minutes for other options.

National Standard GB15763.1-2001, and the British Standard BS 476 Part22:1987