This European standard specifies general requirements and the basic performance criteria and specifies limit values where appropriate for chimneys (including connecting flue pipes and their fittings) used to convey the products of combustion from heating appliances to the outside atmosphere. It is intended to be used as a reference for product standards for components used in the construction of chimneys. It also identifies minimum requirements for marking and evaluation of conformity. It does not apply to structurally independent chimneys. NOTE This European standard can be used as a basis for the specifications of products covered by a European Technical Approval.