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 (Uf) for the HI+ variant of this system goes down to 0.24 (Btu/hr∙ft²∙°F) for a standard opening window. The unique concept of the system makes it perfectly suitable for triple glazing and 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 - 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, Renaissance and Hidden Vent.

The CS 77 system includes the most complete range of solutions for all types of inward and outward opening windows. Ultimate combination possibilities, also with CS 77 doors, CP 130 sliding systems, and Ventalis® ventilation units, make CS 77 extremely suitable for all types of building concepts, even with the highest safety requirements.



Between countries, there are differences in how a window is placed into the wall. For more information on the usage of Reynaers BIM models, download the BIM guidelines.


The Architect Catalogue (PDF) contains information and filenames of the individual CAD files. Please consult this document to find the required CAD files for every section.

Technical information


Min. Visible width frame: inward opening2 inch 
Min. Visible width vent: inward opening1 5/16 inch 
Min. Visible width frame-vent: inward opening3 1/2 inch 
Min. Visible width frame: outward opening11/16 inch 
Min. Visible width frame-vent: outward opening3 11/16 inch 
Min. Visible width T-profile3 inch 
Max. height vent110 1/4 inch 
Max. width vent47 1/4 inch 
Max. weight element170 kg 
Overall system depth frame2 11/16 inch 
Overall system depth vent3 1/16 inch 
Rebate height1 inch 
Min. Glass thickness3/16 inch 
Max. Glass thickness2 1/16 inch 
Min. Glass thickness vent3/16 inch 
Max. Glass thickness vent2 1/2 inch 


Air tightness max. test pressure4 (600 Pa)
Water tightness9A (600 Pa)
Wind load resistanceC3 (1200 Pa)
Acoustic performance42 (-2; -4) dB
Burglar resistance (EN)RC2/WK2
Thermal insulation (Uf)1.8 W/m²K

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
  • Inward opening ventilation ventInward opening ventilation vent
  • Multi patioMulti patio
  • Outward opening combined elementsOutward opening combined elements
  • Outward opening double casementOutward opening double casement
  • 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
  • Outward opening Turn with friction staysOutward opening Turn with friction stays
  • Pivot  horizontalPivot  horizontal
  • Round window fixedRound window fixed
  • Round window horizontal openingRound window horizontal opening
  • Round window vertical openingRound window vertical opening
  • Thermo frontThermo front
  • Thermo front double casementThermo front double casement