MB-45 is the modern cold aluminum system used for making architectural elements of internal buildings that do not require thermal insulation. The important feature of the system is the possibility to bend the profiles, among others door frames, wings and battens, which enables to perform a different kind of arches and arch constructions. Versatility and attractiveness of the system additionally increases to make a choice among a few solutions in case of diffrent construction details eg.sealing the bottom wing of the door, sealing of the sliding and shuttle door, shape of glazing beads, shape and height of door thresholds.