Elegant design with straight aesthetics in which the sash is concealed behind the frame, thus maximizing the glazed surface and the entry of light. In addition, it offers thermal and acoustic performance prompted by the thermal break and a glazing capacity of up to 2 inches that allows the installation of triple glazing. Maximum sash weight of 353 pounds. Inward opening: side hung, tilt & turn, parallel sliding, bottom hung. Clean aesthetics that simulate a fixed element, when in fact, it is a side hung or tilt & turn opening. Exclusive handle integrated in the sash profile, invisible at front view. Possibility of concealed hinges enhancing the aesthetics of the window.