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The character of this kind fire fixed window are as followed:
Product type: Class A, B, C. Fire resistant time: 72min, 54min, 36min.Property:Fire resistant, heat insulation, sound insulation;Pass the GB/T 12513-2006 and the GB 16809-1997;British standard BS476.Practical, aesthetic and affordable; Can be used in all countries and regions;fire fixed window