CS 77 Hidden Vent

CS 77 Hidden Vent

Concept System 77 'Hidden Vent' 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.

doors, CP 130 sliding systems and Ventalis® ventilation units, makes 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 opening3 in. 
Min. Visible width frame-vent: inward opening3 in. 
Min. Visible width T-profile4 in. 
Max. height vent94 1/2 in. 
Max. width vent31 1/2 in. 
Max. weight element264 lbs 
Overall system depth frame2 11/16 in. 
Overall system depth vent2 7/8 in. 
Rebate height3/4 in. 
Min. Glass thickness3/16 in. 
Max. Glass thickness1 7/8 in. 
Min. Glass thickness vent13/16 in. 
Max. Glass thickness vent1 7/8 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
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