Metallic system model PROTEK SKY with zinc-plated sheet, inox steel and insulated polystyrene panels (thickness 20 mm on both sides), covered by a metallic net which makes the plastering adhere, with a structure of 125 mm and total thickness max of 224 mm, for the laying in external perimetral walls, counted for receiving a disappearing sliding lift-windows. This system includes a wooden upright to install the sliding guide, a wooden support frame necessary for the finish, and it’s ready for the installation of the hardware for lift-slide windows (not provided).