Bertrand Windows and Doors



The MB-FERROLINE window system with a thermal break is a solution perfect for the renovation of historic buildings, while maintaining the appropriate appearance of the windows, which can imitate steel joinery and at the same time ensure very good technical parameters of the structure.


Installation depth


  1. Classic window look.
  2. High degree of thermal protection of the structure resulting from the use of technical solutions of the MB-86 system.
  3. High tightness against water and air infiltration.
  4. Wide glazing range up to 61.5 mm.
  5. Possibility of making anti-burglary structures up to RC2 class

The MB FERROLINE system can be used to make various types of windows opening inwards (hinged, tilted, tilt-and-turn), windows opening outwards (hinged or tilted) and fixed windows, which, in addition to excellent thermal insulation, are also characterized by very good acoustic insulation and water tightness. and air and high durability.

There are several types of external appearance of sections available. The renovation frames available in the system allow for the installation of new joinery without the need to dismantle the old frames, and therefore without the risk of possible damage to the wall around the windows. The visible width of aluminum profiles is adjusted so that it does not cause significant differences in the external appearance between old and new windows. Based on proven solutions and having a whole range of new profiles with appropriate shapes, the MB-FERROLINE system allows us to create structures with an appearance that perfectly matches the character of the building.

Functionality and aesthetics

Cross-section through an opening window with a renovation frame
Cross-section through a mullion and opening windows

Product MB FERROLINE comes in the following versions

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