NOVELTY - The curtain wall unit (14) has a frame made of a casting material. The frame defines at least one infill area (22) for receiving and retaining an infill element (24). A connector assembly is operatively engaged to the frame for secure attachment of the frame to a standing structure (12). The infill element is selected from a group consisting of glass, fabrics, stones, metals, louvers (26), vents and their combinations.    USE - Curtain wall unit used in assembly of curtain walls. Can be used in assembling curtain walls used as outer coverings for standing structures such as buildings and skyscrapers.    ADVANTAGE - Provides a curtain wall unit adapted for forming a curtain wall that is environmentally friendly, and simple and cost-effective to fabricate and implement, while broadening the flexibility and range of aesthetic designs beyond those typically associated with extruded metal construction. Exhibits desirable characteristics including high compressive strength, excellent ductility, and high tensile strength. Ensures that the curtain wall unit possesses improved durability, exceptional fireproof ratings, excellent blast resistance, corrosion resistance, and water impermeability desirable in a curtain wall. Ensures that the curtain wall unit is fabricated in a factory setting including infill panels such as factory glazing for use in unitized curtain wall systems. Ensures that the curtain wall units are adapted for ready installation on the building structure to form the building enclosure. Ensures that the unitized curtain wall structures have the advantages of speed, lower field installation costs, and better quality control within an interior climate controlled environment of a factory. Ensures that the curtain wall is designed to insulate by eliminating or minimizing thermal bridging, block outside sound and noise, and seal against passage of water and air to provide a comfortable environment within the standing structure.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for the curtain wall unit fabrication method.    DESCRIPTION OF DRAWING(S) - The drawing shows the perspective view of a building structure on which the curtain wall units are installed during assembly of the curtain wall.    Standing structure (12)    Curtain wall unit (14)    Upper portion of curtain wall unit (16)    Lower portion of curtain wall unit (18)    Side portions of curtain wall unit (20)    Infill area (22)    Infill element (24)    Louvers (26)