PE 68 variant with three-chamber construction, with “euro” standard groove and groove used in windows and balcony doors made of PCV or wooden profiles. The structural depth of profiles for frame equals 68mm, for sashes 76mm. The system allows to apply fillings 18-59mm wide. Additionally the thermal insulation of the system is better because of the special insulating inputs. The system reaches various heat transfer coefficient depending on the location of insulating inserts. In PE 68HI version – with closed glass chamber and insulating insert in the profile chamber – reaches Uf value from 1,3 W/m2K.