of the listed buildings is only 80 kWh/m² per year. - Window systems forster unico, forster unico XS Fire-resistant door system forster fuego light Metal fabrication: Chauvet SAS , Vouillet (F) Architecture: [...] building agency, the architects opted to base their renovation of the façade on the forster unico and forster unico XS steel window system. The particularly slim steel profiles of the segmented bay windows [...] largely invisible from the outside, the architects opted for the forster unico window system on the upper floors, accompanied by the forster fuego light fire-resistant door system: the plain steel profiles