In total, Gartner produced around 10,000 sqm (107,600 sq ft) of façades for the new “Aile Est” and 2,600 sqm (28,000 sq ft) for the “Processeur“. The East Wing is composed of seven gates consisting of three and four modules, respectively, with a length of 20 m (66 ft), subdivided in grids of 2.50 m (82 ft). Each grid has a height of 10 m (33 ft) and consists of two glass panes weighing around 1.3 tons. Structural tolerances are compensated for by small expansion joints between the modules while large expansion joints between the gates are designed to compensate for building movements. An exterior steel frame is reinforced by a “Raidisseur“, an exterior steel truss. The glass panels which are partly installed one above the other are held from the inside by pressure bars made of aluminum. In some parts of the façade, the glass panels are installed in the steel frame with setting blocks serving as a stiff­ening component. Louver windows, which only open in the event of fire, serve as smoke vent in the gable façades and in every “Porte” on the landside.