The RW40 DUO system, consists of 4 glassboards, two fixed and another two sliding ones. Lifting the upper pane, also moves the lower pane, uncovering half of the opening’s surface. The system combines high functionality and elegant design. The vertical aluminum profiles are 40x80mm in size, while the thickness of the glassboards are 10mm. The SD18 is suitable for both commercial and residential spaces.