You can easily retrofit external sun protection to your windows as part of a renovation or modernization project. The heroal textile screens are ideal for retrofitting due to their small winding circumference and the resulting small box size, and blend in perfectly and almost invisibly with the appearance of the building. You have the choice between installation with a visible front-mounted box or with an invisible flush-mounted cover box integrated into the building façade. With a front-mounted box in different sizes, shapes and colors, the sun shading can not only be individually adapted to your building, but also easily installed on the outer shell of the building. Apart from installing the sun shading system, no other changes need to be made to the building (e.g. plastering or painting work).