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The declared unit is a screen of width 3.0m and height 2.70m, incorporating a door opening 1m wide. The declared unit includes 12mm thick glass, head and base track, wall abutments and a door frame (reveal). Indicator values are declared separately for double-glazed partitions and single-glazed partitions. The mass of the declared unit is 175kg (single-glazed) or 333kg (double-glazed). The minimum mass of a screen of the specified dimensions in a single-glazed partition system with 10mm glass is 149kg; its maximum is 228kg (16mm glass). The minimum mass of this screen in a double-glazed partition system with 6mm and 10mm glass faces is 230kg; its maximum is 438kg (both faces in 16mm glass).