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The windows must be realised with the METRA NC 65 STH – HES WS system. 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 and respecting the tolerances according to EN 12020-2. The system must provide profiles with thermal break, realized with insulating bars made of fibre glass reinforced polyamide at 25%. The profile is tested and certified according to standard EN 14024 by an accredited certifying body to ensure the mechanical resistance of the joint between polyamide bars meets requirements. The insulating bars allow anodization and painting at temperatures up to 180°C - 200°C for 15 minutes without any alteration of the joint’s quality. The profiles have bars with width over 34 mm. The triple chamber profiles enable the use of 2 corner cleats o 2 U-bolts. The frames and sashes host glass sheets respectively from 48 and 58 mm for the base line. Corner joints are built with die-cast aluminium corner keys to be fitted to the internal and external tubular structures of the thermal-break profiles. Corner cleats are fastened by plugging and/or crimping. Alignment of profiles at corner joints is ensured by special aligning corner cleats. The sashes are also provided with an external and internal aligning corner cleats. T-shaped U bolts are fixed through pins. The sections of the horizontal and vertical profiles are carefully sealed before being joined by the corner cleats in order to avoid infiltration or corrosion. The external profiles of the sashes provide a groove for the infiltration and condensation waters, to allow their outflow through specific slots. The polyamide bars have a suitable geometrical shape in order to avoid any eventual stagnation of infiltration and condensation waters and to be perfectly coplanar with the transversal sides of the aluminium profiles. The external profiles of frames and sashes are provided by a groove for the gathering of infiltration water. The slots for drainage and ventilation on the frames are protected by special caps with internal anti-reflux membranes. All gaskets are be made of EPDM. Windows are provided with a central tightening gasket (open joint). The perimeter continuity of this gasket is ensured by the use of suitably glued vulcanised corners. Internal and external tournant-type glass-holding gaskets are used. These gaskets ensure perimeter continuity without cuts at corners. The internal glass-holding gaskets also compensate for any difference in thickness, which is inevitable in double glazing and/or laminated sheets, as well as ensure proper perimeter pressure. The glazing bead profiles are contrast or snap-on fitted. Under wind pressure, glazing beads guarantee total pressure on the glass sheet / panel without yielding. Glazing beads are 22 mm high to ensure an adequate bond of the glass sheet and/or panel and to provide adequate coverage of sealants used for insulating glass, protecting them from the sun and preventing their early deterioration.