A new window design with a 'euro' hardware groove, with a concealed sash, characterised by extremely slim joinery. The cross-section visible from the outside is only 66 mm, which increases the glazing area. The glazing can account for up to 85% of the entire window area. This provides excellent interior illumination.

The window was designed in such a way that, when viewed from the outside, it is impossible to distinguish between fixed and operable glazing. This has resulted in a perfectly uniform aesthetic façade.
The 35 mm thermal break zone and the polyolefin foam placed in the frame and sash allow an insulation factor of up to 1.0 W/m²K to be achieved, thus increasing energy efficiency. In addition, the system is characterised by a high degree of interior soundproofing, which is achieved by being able to use glazing up to 40 mm thick.

The results of the AEV test confirm the excellent waterproofing, airtightness and wind load resistance properties. This system provides the highest level of protection against adverse weather conditions.