The variant of SL1600tt lift and slide system with high thermal insulation assigned for the most demanding customers. In PLUS version, the Uf, equals 2,1 W/m2K and higher, in the top HI variant the frame heat transfer coefficient equals 1,8 W/m2K and higher. The structural depth equals: 67mm for sashes, 160 mm for double track frames and 247mm for triple track frames. The structure allows to make stable constructions of large size, with even 6 sashes and of very large sash weight. The system allows to apply fillings up to 50mm thick. Characteristics of system: possibility of assembling few variants of insulation ( version standard, PLUS, HI ) high resistance to weather conditions.