This is a 3D CAD rendering of a glass curtain wall system, showcasing a detailed section cut of the horizontal mullion and insulated glass unit (IGU). The model displays how the aluminum extrusion profile supports dual-pane glass, complete with internal gaskets, pressure plate, and snap-on cover cap. This system is typical in commercial and high-rise architectural facades, allowing for efficient structural support and weather sealing while maintaining a sleek, transparent appearance.