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This document defines rules for extended applications, provides guidance, and, where appropriate, specifies procedures, for variations of certain parameters and factors associated with the design of internal non-loadbearing ceilings constructed of metal faced sandwich panels that have been tested in accordance with EN 1364-2, which could generate a classification in accordance with EN 13501-2. This document applies to self-supporting, double skin metal faced sandwich panels, which have an insulating core bonded to both facings as defined in EN 14509.