Think of a highly thermal insulated window with a sash frame not visible from the outside. This is its cross section picture. The material used is aluminium alloy combined with poly-amide bars and insulation material in between. Modern design of the fenestration where there are no plastic taps for the drainage holes on the outer view. This is because the drainage occurs through holes made on a special channel through the casement profile. The patent is available to potential investors, with a complete set of technical drawings and specifications for mass production.