The structural depth of the window sections is 45 mm (frame), 54 mm (casement), and the door is 45 mm and 45 mm respectively. Such assumed depths of the sash and frame sections give the effect of one plane from the outside after closing – in the case of windows and the effect of flush surfaces of the sash and frame – in the case of doors. The shape of the profiles allows for slender and durable window and door constructions.
An important advantage of the MB-45 system is the possibility of bending profiles, including door frames, wings and lacings, which allows the construction of various types of arches and arch structures.
A characteristic feature of the system is its close connection with the window-door systems MB-60 and MB-70.