The concealed frames of the systems fit seamlessly into the floor, wall and ceiling. Thanks to intelligent technology, even glass elements with an area of up to 15 m² and a weight of up to 1,000 kg can be moved effortlessly and silently. The highly thermally insulated cero III system with 3-fold glazing and a sash depth of 72 mm impresses with its particularly high energy efficiency: cero III can achieve Uw values of up ≥ 0.80 W/m²K and thus meet passive house standards.