People are continuously looking for ways to maximize their space, as well visually as physically. The Folding door offers them the opportunity to optimize the utilization of their rooms, drawing the external environment into their homes. Next to the improved space utilization, this system offers the advantage of loads of daylight coming in, as well as an aesthetical design. Another practical feature of the folding door is the optional door locking principle which allows to use the first leaf as an entrance door without affecting the folding capacity of the system.