You can easily retrofit your windows with blinds installed outside in the course of renovation or modernisation. heroal textile screens are perfectly suited for a retrofit due to their low winding diameter and the resulting small box size; and they fit perfectly and almost invisibly into the look of the building. You can choose between the installation using a visible surface-mounted box or an invisible plaster-base box integrated into the façade. Surface-mounted boxes in different sizes, designs and colours allow you to individually adapt the sun protection to your building, and provide for an easy fixture to the outer shell of the building. Other than the installation of the sun protection, there are no other changes to the building required, such as plastering or painting.