MB-45 is an aluminium window and door system used to construct functional and lightweight internal partition walls. It can be used to make windows, doors opening inwards and outwards, sliding systems, swing doors, automatic doors and smoke-proof doors (MB-45S). This system is very often used to construct vestibules or internal walls in office buildings. The Aluprof MB-45 system is a single chamber system, as good thermal insulation properties are not required in this case. MB-45 is based on a 45 mm wide frame and a 54 mm (windows) or 45 mm (doors) casement. It is most often equipped with single glazing, but it is possible to successfully use glazing packages of up to 34 mm in the case of windows. Using this system, doors of very large dimensions can be made, where the weight of the leaf can be up to 130 kg.