The new HST 85 mm door system is, on the one hand, a response to the expectations regarding the creation of larger and larger window structures, and on the other hand, through structural changes, and above all, the possibility of using wider glazing units with a width of up to 51 mm, allows to obtain above-average properties in terms of thermal insulation. . A novelty in this segment is the modular nature of the structure, which enables any three product configurations, depending on the expected thermal parameters.

Due to the increase in the depth of the wings used in the construction of HST balcony doors to 85 mm, the sealing knot at the line of overlapping of the sections of the movable and fixed parts was also modified. The flat gasket used so far has been replaced with an EPDM gasket with a tubular cross-section. By slightly increasing the values of operational forces necessary to completely close the wing, a significant increase in the air tightness of the joint was thus obtained.