This European Standard specifies the performance requiremets for single-and- multi-wall system chimney products with rigid metallic liners with nominal diameter up to and including 1200 mm, used to convey the products of combustion from appliances to the outside atmosphere. It also specifies the requirements for marking, manufactures's instructions, prduct information and evaluation of conformity. Metal liners and metal connecting flue pipes not covered here are included in EN 1856-2: 2004.