This document describes the method of specifying the design, installation and labelling criteria for chimney systems, construction of custom-built chimneys, the relining or converting of existing chimneys, connecting flue pipes and air supply pipes for room sealed applications. It also gives information on commissioning of an installed chimney. This document applies to chimneys which are subject to the following limiting conditions (specified in EN 13084-1): the horizontal distance between the building and the outer wall of the chimney system not to exceed 1 m, the distance between the supports not to exceed 4 m, the distance above the last structural attachment not to exceed 3 m. This document does not cover: chimneys which serve a mixture of fan assisted or forced draught burners or natural draught appliances, installations having a configuration of the type C2. NOTE Room sealed gas appliances are classified as type C according to EN 1749. The methods in this part of this document are applicable to chimneys and connecting flue pipes for room sealed combustion appliances. The methods in Part 1 of this document are applicable to chimneys and connecting flue pipes for non-room sealed combustion appliances. For the purpose of this document European Standard the term "installation" includes construction.