This draft European Standard provides guidance and, where appropriate, defines procedures for variations of certain parameters and factors associated with the design of fire-resistant glazed elements which have been tested in accordance with EN 1363-1, EN 1363-2 and EN 1364-1, and classified according to EN 13501-2. This Standard applies to vertically installed fire resistant glazed elements. This standard does not apply to doorsets and operable windows. Glass block assemblies and paver units and channel-shaped glass as defined in prEN 1051 and EN 572-7 are excluded. There is currently insufficient information available to enable rules for extended application to be developed for these products.