Large-scale aluminum façades are a frequently requested solution in modern architecture. They give buildings a contemporary look and offer the opportunity to incorporate the surroundings into the building design. Above all, however, they allow plenty of daylight into the interior, minimize the use of artificial lighting and can be used for passive solar heat generation. To prevent too much UV and heat radiation from entering the building and to prevent glare, solar shading can be integrated into the façade from the outside. The partial integration of the heroal VS Z CS zip screen system using the heroal GR 25 guide rail in the heroal C 50 façade system or mullion-transom façades from other manufacturers is a solution that has been thought through down to the last detail for the aesthetic installation of sun protection in mullion-transom façades.