Fold & slide systems are used to cover wide openings on facades. It is an ideal solution for balconies, terraces and gardens, such places where connect outdoors and indoors places. There is generally one active sash, which operates the system, the others sashes fold on to each other by sliding on the rail system. In this way, users have the opportunity to go outside without having any obstacles and will be able to get more advantage of daylight and continuous view. Depending on the wideness of the gap, the quantity of sashes change between 2 to 7. The standard window sash dimensions are given as 1000 mm wide, 2350 mm height with a carrying capacity of 130 kg depending on the profile. Although these systems have a standard threshold, it is possible to apply a hidden threshold by setting the system under the floor.