This standard is a product specification for clay/ceramic chimney outer wall elements with solid walls or walls with vertical perforations. When they are installed, they will form the outer walls of system chimneys which serve to convey products of combustion from fireplaces or heating appliances to the atmosphere under negative or positive pressure. This standard specifies the performance requirements for factory-made clay/ceramic chimney outer wall elements. Testing,CE- marking and inspection requirements are covered by this standard.