PE 68 three-chamber thermally insulated system for door profile. The system has a coplanar structure profiles and the possibility of using glazing beads with 24 mm profiled fibreglass reinforced polyamide strips. Specially designed, compatible profiles enable easy connection of the door to the windows. The structural depth of the frame and vent is 68 mm. As the system appears to be rigid and durable, the doors of large dimension can be designed.