External folding doors offer a great deal of freedom to users. They can easily take advantage of favourable weather conditions and almost literally remove the barrier between the interior of the building and its surroundings.​​​​​​​​​​​​​​
Such doors can therefore provide an excellent, wide passage from the house to the terrace or connect a café or restaurant with its outdoor area used seasonally.​​​​​​​​​​​​​​​​​​​​​ The MB-86 FOLD LINE system is a solution that is very convenient for everyday use, yet has high technical parameters and allows large-size structures to be made. Folding doors can open both outwards and inwards, and can have any leaf configuration. It is a state-of-the-art product, designed to meet the high requirements of users, architects and builders.​​​​​​​​​​​​​​Features and benefits of the MB-86 FOLD LINE system:

• three-chambered, heavy-duty aluminium sections with structural depth: 86 mm for frames and 77 mm for door leaves
• central chamber of the sections equipped with thermal breaks 24 mm wide for frames and 34 mm wide for door leaves, which translates into high thermal insulation of the construction, specialised fittings dedicated to the MB-86 FOLD LINE system to guarantee comfortable functioning of door leaves with a maximum weight of 100 kg
• large structural dimensions, allowing the construction of doors with leaf heights of up to 2,700 mm and widths of up to 1,000 mm
• different versions of threshold solutions: classic - with swing seal or convenient with a low threshold
• a large glazing range of 14 to 61.5 mm, allowing the use of both single-chamber and double-chamber packets, including specialised ones: with increased acoustic insulation or burglary resistance.
• significant scope of compatibility of the MB-86 FOLD LINE system construction with the well-known and appreciated ALUPROF MB-86 window and door system: joining of profiles analogous to MB-86, as well as some sections, seals and accessories common for both systems