This European Standard describes the method of specifying the design, installation and labelling criteria for chimney systems, connecting flue pipes and air supply pipes for roomsealed heating applications. It also gives information on commissioning of an installed chimney. This standard does not cover: - chimneys designated H (high positive pressure chimneys), and chimneys designated P (normal positive pressure chimneys) serving more than one appliance, - chimneys which serve a mixture of fan assisted or forced draught burners or natural draught appliances, - installations having a configuration of the type C2. This European Standard does not apply to freestanding chimneys covered by EN 13084-1. This standard also specifies limitations for supporting a chimney, and the maximum unsupported chimney height for system chimneys and custom built chimneys. NOTE Roomsealed gas appliances are classified as type C according to CEN/TR 1749.