Bertrand Windows and Doors



MasterLine 8 is a unique window system that offers countless design possibilities and excellent parameters regarding thermal insulation, air permeability, water tightness and resistance to wind loads. The new generation of innovative window solutions reflects current trends in architecture, which aim to maximize the use of daylight while maintaining the highest level of thermal insulation.

Resistance to wind load




  1. Air tightness: Class 4 (600Pa)
  2. Water resistance: Class E900 (900Pa)
  3. Min. leaf height: 600 mm
  4. Max. leaf height: 2800 mm
  5. Min. leaf width: 450 mm
  6. Max. leaf width: 1700 mm
Hidden drainage
No more plastic caps, enjoy a clean design.
Better water drainage, without additional obstacles.
Low threshold
Easy access, neat appearance.
Barrier-free entry, even with floor finishing.
Hidden hinges
Details count for good looks, hidden hinges are the best finish.
Soft closing
Better water drainage, without additional obstacles.
Tested and proven, for peace of mind.
Access control
Smart and interactive home.

MasterLine 8 offers three levels of insulation, making it suitable for use in buildings with a high level of insulation, energy-saving and even passive buildings. Obtaining different levels of insulation is possible thanks to the use of technologically advanced and innovative materials. This unique system solution offers new options for opening leaves of various sizes, such as single-leaf or double-leaf balcony doors with a low threshold, both inward and outward opening doors. The possibility of choosing an aesthetic variant means that MasterLine 8 can be used for any architectural style.


Product MASTERLINE 8 comes in the following versions


ask about the product

If you have any questions about the MASTERLINE 8 product or are interested in cooperation, do not hesitate - fill out our contact form.