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The sliding windows are manufactured with METRA NC-S120STH Montreal /Europa/Slim, NC-S150HES, NC170HES and NC-S175HES LUX systems. The profiles are made of aluminium alloy EN AW 6060 (EN 573-3 and EN 755-2) with temper designation T5 according to EN 515, extruded in compliance with the tolerances according to EN 12020-2. The systems include thermal break profiles, made with insulating strips of polyamide PA 6.6 reinforced with 25% glass fibre. Thermal insulation of the profiles is achieved by inserting special reinforced polyamide bars between the two separately extruded profile elements. The profiles are assembled by mechanical rolling after knurling the extruded aluminium. The insulating strips can be oven painted at temperatures of up to 180 - 200° for 15 minutes without affecting the quality of the connection. The frame profiles have a double row of strips with a width of at least 16 mm. The sash profiles have bars with a minimum width of 18 mm. The sash profiles are of the three-chambered type to enable the use of 2 corner cleats in the corner joints.