The SLF 400 folding-bellowing system is fixed to divide rooms, thanks to which they are able to function independently of each other. The system assumes the fitting of a rail and trolleys in the ceiling, with the upper slat ensuring the firm and stable manipulation of the trolleys. Another advantage of the system is an easier assembly and lack of lower runner, meaning it is not necessary to clean the surface of the panel riding system. Application of hinges between the sashes allows for resignation from the parking box.