They serve for protection against solar radiation, that is, from excessive sun exposure. Brise soleis are mounted as elements in front of the building or are otherwise positioned to create shade, thus preventing overheating of the facility during hot summer days. In the beginning, brise soleils were element that had more an aesthetic role than practical qualities, but today, when environmental sustainability has become one of the main demands, they have a very important role in the overall energy efficiency of buildings. Brise soleils can be motor operated or fixed. Thanks to the lightness of aluminum they are very easy to install and do not represent a large load on the structure.