CS 104

CS 104

Concept System 104 'High Insulating' aluminium window

Solution for low energy constructions

Concept System® 104 is an innovative inward opening aluminium window, designed to increase comfort and decrease energy consumption to a minimum. The extreme insulation levels (Uf down to 0.88 W/m²K) are achieved by a patented technology, in which insulation strips with increased stability are combined with special foam in a way that no extra manipulation is needed during the production of the window. This guarantees constant quality, making this window perfectly applicable for passive constructions.

Besides a high insulation level, air tightness is the most important factor determining a windows energy efficiency. For the CS 104 window a new set of specific gaskets have been developed to ensure an ultimate water- and air tightness of the window, making it theperfect window for extreme weather conditions such as coastal areas and high altitudes. The increased built-in depth (104mm) contributes to the strength and stability of the window allowing large dimensions, even with triple glazing. 

The aluminium window perfectly matches the CS 104 door and is able to offer different levels of burglar resistance (class 2 and 3).



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 opening69 mm 
Min. Visible width vent: inward opening48 mm 
Min. Visible width frame-vent: inward opening122 mm 
Min. Visible width frame: outward opening- mm 
Min. Visible width vent: outward opening- mm 
Min. Visible width frame-vent: outward opening- mm 
Min. Visible width T-profile99 mm 
Max. height vent2400 mm 
Max. width vent1700 mm 
Max. weight element130 kg 
Overall system depth frame95 mm 
Overall system depth vent104 mm 
Min. Glass thickness24 mm 
Max. Glass thickness65 mm 
Min. Glass thickness vent24 mm 
Max. Glass thickness vent65 mm 


Air tightness max. test pressure4 (600 Pa)
Water tightnessE900 (900 Pa)
Wind load resistanceC5 (2000 Pa)
Burglar resistanceRC 2/WK 2
Thermal insulation (Uf)0,88 W/m²K

Opening elements

  • FixedFixed
  • 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
  • Round window fixedRound window fixed
  • Round window horizontal openingRound window horizontal opening
  • Round window vertical openingRound window vertical opening