Aluminium Folding Doors MB-86 FOLD LINE HD

Brand: Aluprof
What you get
  • Glazing in units up to 61.5 mm
  • 3-chamber profiles with construction depth of 86 mm for frames and 77 mm for door sashes
  • Sash height of up to 3000 mm and width of 700-1200 mm
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Lead time: up to 8 weeks Find out more

Guarantee included at purchase Find out more


Depth of the frame [mm]86
Maximum thickness of the glazing unit [mm]61.5
Wind resistanceC1
Water resistance9A
Air permeabilityClass 4
Specifications - Read more

Wind resistance

It is one of the most important properties of windows and doors. It determines the safety of the entire structure, as it indicates the amount of pressure caused by wind that the window or door structure is able to resist without serious damage. The classification of wind-resistant windows and doors is carried out in accordance with PN-EN 14351-1. The wind load resistance of the window is described by two symbols: the number (1-5) which indicates the pressure of wind applied to the product and the letter (A-C) which indicates the amount of accepted deflection.

Thickness of the glazing unit

A glazing unit is a structure consisting of two, three, or even four panes of glazing separated from each other by a distance frame, sealants and vapour-absorbing gas (argon \ krypton). The thickness of the glazing unit is the overall measurement, from the outside glass surface to the inside glass surface. The average double glazing thickness is about 24 mm while triple-glazed windows are 42 – 48 mm in thickness on average. The number of panes in a glazing unit affects the improvement of the U-value parameter

Water resistance

It is the capacity to avoid water leakages under wind and rain at the same time. Leakage is defined as the appearance of uncontrolled water (other than condensation) on the inner surface of the product. Obviously, the doors and windows with good waterproof performance can effectively prevent water from entering into their internal structure and – as a result – ensure a longer service life. The classification ranges from Class 0 (no test) to Class 7A for windows and Class 3A for doors.

Air permeability

It is the measurement showing how easily air can pass through a window or a door. The European Standard regarding air permeability in windows and doors is EN 12207. It classifies windows or doors according to their capability to prevent air travel through the system. This capability is measured on a scale, from Class 1 (less tightness) to Class 4 (higher tightness). A window or a door system with a higher level of air tightness is more energy-efficient, as less heated air escapes through it.

Depth of the frame

A very important dimension, saying a lot about sliding doors quality and functionality. The depth affects the sound insulation, thermal insulation (U-value) and stiffness of the structure. To put it simply: the bigger the depth, the warmer the sliding doors.

The MB-86 FOLD LINE HD system is a very convenient solution in everyday use and has high technical parameters: very good thermal and acoustic insulation properties as well as tightness to water penetration and air infiltration. It allows to make structures of large dimensions. The bi-fold doors based on the MB-86 Fold Line HD system can be opened both outside and inside the building, and can have any sash configuration. It is a modern product, designed to meet the high requirements of users, architects and investors.


  • 3-chamber, durable aluminium sections with a construction depth of 86 mm for frames and 77 mm for door sashes
  • corner and panoramic solutions available – the structure can be assembled from 8 sashes
  • the central chamber of the sections is equipped with thermal breaks (24 mm wide for frames and 34 mm wide for door sash), which translates into high thermal insulation of the structure
  • specialised fittings dedicated to the MB-86 FOLD LINE HD system, guaranteeing comfortable operation of door sashes with a maximum weight of 120 kg
  • large dimensions of the structure, allowing the construction of doors with a sash height of up to 3000 mm and a width of 700 to 1200 mm
  • the largest number of threshold solutions, e.g. with cover sealing or convenient to use – with a hidden threshold
  • a large range of glazing from 13.5 to 61.5 mm, allowing the use of both single- and double-chamber packages, including specialised ones: with increased acoustic insulation or burglary resistance
  • a wide range of compatibility of the MB-86 FOLD LINE HD system construction with the MB-86N window and door system: connecting profiles as in MB-86N, as well as some sections, seals and accessories common to both systems

Price list

“The prices shown in the Price List are for white, double-glazed and/or triple-glazed products and do not include changes in colours, accessories, dimensions, etc. Each change affects the final price of the product. The presented price offer is for information purposes only. If you want to know the detailed quote on your individual order, please contact our Sales Team. We will get back to you with the final price that is tailored to your specific needs – free of charge!

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