What is meant by the term 'spandrel panel' in reference to building facades?

A spandrel panel is a non-structural panel located between the floor slab and the window in a building facade. It is used to conceal the building structure, mechanical services, and insulation while maintaining the exterior facade's continuity. Spandrel panels are typically made of glass, stone or metal, and are coated with a material that matches the window glazing. They are an important element in the overall aesthetic of a building facade.

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