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A curtain wall spandrel is the non-structural, opaque panel located between the vision glass and the slab edge in a curtain wall system. It conceals structural elements and provides thermal insulation and aesthetic continuity.
A curtain wall spandrel can be modeled as a , by simily nominating its thermal properties to represent its geometry within the building envelope. The Total R-value is typically around 0.55 for an aluminium spandrel