CS 77

CS 77

Concept System 77 window

Optimized safety and comfort

Concept System® 77 is a high insulating window system that meets elevated requirements regarding thermal insulation, stability, and security. Anticipating the thermal requirements, the insulation value (Uw) for the HI+ variant of this system goes down to 0.20 Btu/hr∙ft²∙°F for a standard opening window. The unique concept of the system makes it perfectly suitable for triple glazing. CS 77 even achieved the Swiss Minergie® component label.

The system’s performance regarding acoustics, water- and air tightness, but also for specific applications like Bullet Resistance, meets the most stringent standards. Moreover, CS 77 windows are available in different burglar resistance levels, so it is an extremely secure system.

To match the different building types, the system is available in various aesthetic styles: Functional, Renaissance, and Hidden Vent.

The CS 77 system includes the widest range of solutions for all types of inward and outward opening windows. There are ultimate combination possibilities with CS 77 doors, CP 130 sliding systems, and Ventalis® ventilation units, making CS 77 extremely suitable for all types of building concepts, even with the highest safety requirements.


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Technical information


Min. Visible width frame: inward opening2 in. 
Min. Visible width frame-vent: inward opening3 1/2 in. 
Min. Visible width frame: outward opening11/16 in. 
Min. Visible width frame-vent: outward opening3 11/16 in. 
Min. Visible width T-profile3 in. 
Max. height vent110 1/4 in. 
Max. width vent47 1/4 in. 
Max. weight element374 lbs 
Overall system depth frame2 11/16 in. 
Overall system depth vent3 1/16 in. 
Rebate height1 in. 
Min. Glass thickness3/16 in. 
Max. Glass thickness2 1/16 in. 
Min. Glass thickness vent3/16 in. 
Max. Glass thickness vent2 1/2 in. 


Air tightness max. test pressure0.04 cfm/ft²
Water tightness12 psf
Design pressure120
Acoustic performance STC (ASTM E90-09/1332)43
Acoustic performance OITC (ASTM E90-09/1332)34
AAMA RatingClass AW
PG Rating120
Burglar resistance (EN)RC2/WK2
Thermal insulation Uw - Double0.24 Btu/hr∙ft²∙°F
Thermal insulation Uw - Triple0.17 Btu/hr∙ft²∙°F

Opening elements

  • Fixed WindowFixed Window
  • Inward opening combined elementsInward opening combined elements
  • Inward Opening Double CasementInward Opening Double Casement
  • Inward Opening TiltInward Opening Tilt
  • Inward Opening Tilt TurnInward Opening Tilt Turn
  • Inward Opening TurnInward Opening Turn
  • Inward Opening Turn TiltInward Opening Turn Tilt
  • Outward Opening Combined ElementsOutward Opening Combined Elements
  • Outward Opening Double CasementOutward Opening Double Casement
  • Outward Opening ParallelOutward Opening Parallel
  • Outward Opening Top HungOutward Opening Top Hung
  • Outward Opening Top Hung With Friction StaysOutward Opening Top Hung With Friction Stays
  • Outward Opening TurnOutward Opening Turn
  • Pivot HorizontalPivot Horizontal
  • Round Window FixedRound Window Fixed
  • Thermo FrontThermo Front
  • Inward Opening Ventilation VentInward Opening Ventilation Vent
  • Outward Opening Turn With Friction StaysOutward Opening Turn With Friction Stays
  • Round Window Horizontal OpeningRound Window Horizontal Opening
  • Round Window Vertical OpeningRound Window Vertical Opening
  • Thermo Front Double CasementThermo Front Double Casement
  • Multi PatioMulti Patio