People are continuously looking for ways to maximize their space, as well visually as physically. The Concept Axsys 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 innovative system offers the advantage of loads of daylight coming in, as well as an aesthetical design. Next to the functional design FD-83 is the solution for maximum performance in terms of air, wind and water resistance, with decreased threshold, the Low Threshold option offering a rise of only 8 mm and finally the Flat Bottom solution allowing easy passing and maximum convenience for high traffic. Another practical feature of FD-83 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.