A ceiling grid system, also known as a suspended ceiling or T-bar ceiling, is a common solution for concealing overhead utilities while providing an aesthetic finish to a room. The primary components of such a system include:1.  Main Tees: These are the longest and strongest members of the grid, spanning the width of the room and supporting the weight of the entire system. They are typically hung from the overhead structure using hanger wires.
2.  Cross Tees: These shorter members intersect with the main tees, forming the grid pattern. They come in various lengths (e.g., 2-foot or 4-foot) to create different panel sizes.
3.  Wall Angle (or Wall Molding): This L-shaped trim piece is installed around the perimeter of the room, providing a finished edge for the ceiling tiles and supporting the ends of the main and cross tees that meet the wall.
4.  Hanger Wires: These wires suspend the main tees and the entire grid system from the structural elements above (e.g., joists, trusses, or concrete slabs).
5.  Ceiling Tiles/Panels: These lightweight panels, made from materials like mineral fiber, fiberglass, or gypsum, are laid into the grid system to form the visible ceiling surface. They come in various textures, colors, and acoustical properties.
6.  Clips/Fasteners: Various clips and fasteners may be used to secure components, especially in seismic or high-performance applications.Together, these components create a sturdy and accessible framework that allows for easy installation, removal, and access to the plenum space above the ceiling.