The three-chamber insulated system for doors. The system has a coplanar structure profiles (notch clearance 18 mm) and the possibility of using glazing beads for “euro” standard groove. In PE68 system specially profiled thermal breaks in the width of 24 mm are applied. What is more, specially designed, compatible profiles enable the connection between the door and windows. The structural depth of the frames and sashes is 68 mm. There is a possibility to apply double and triple glazed units at the width of 51 mm. The frame heat transfer coefficient equals 1,5-2,1 W/m2K. Wide range of hardware and doors locks can be used. PE68 allows to make kneaded, as well as screwed corner connections.