Window shutter systems have an additional value for buildings in terms of visual and natural way by having a blinding purpose. It can be applied in every window and door opening. Shutter lamellas can be put inside the sashes by having a more modern look or they can also be put outside the sashes and have a more classic look. It is also possible to use sliding or folding systems with various number of sashes. Sashes can be locked both in opened or closed positions. Moreover, moveable lamellas with different dimensions can be applied to the system.