Concept System® 77 is a high insulating window system that meets elevated requirements regarding thermal insulation, stability and security. Anticipating on the thermal requirements, the insulation value (Uf) for the HI+ variant of this system goes down to 1.7 W/m²K for a standard opening window.

The system’s performance regarding acoustics, water- and air tightness, but also for specific applications like Bullet – and Fire Resistance, meets the most severe European standards. Moreover, CS 77 windows are available in different burglar resistance levels (class 2 & 3) making it an extremely secure system.

To match the different building types, the system is available in a variety of aesthetic styles: Functional, Softline and Hidden Vent.
The CS 77 system includes the most complete range of solutions for all types of inward and outward opening windows.