This European Standard specifies the requirements and test methods for multiwall system chimneys working under wet conditions (in the following expressed as "wet chimney") with pressure type N1, N2 or P1 according to EN 1443 and a working temperature below or equal T600 according to prEN 13063-1, in which the products of combustion are conveyed to the atmosphere through clay/ceramic flue liners. Marking and inspection are also covered by this document. This European Standard does not apply to structurally independent (free standing or self-supporting) system chimneys. The wet chimney may comprise the following appropriate components:clay/ceramic flue liners;insulation layer;outer walls;acid resistant mortar for jointing flue liners or elastomeric sealant;mortar for jointing outer walls;terminal;chimney base;condensate collector;condensate outlet;cladding;opening section;cleaning and inspection door;distance piece;reinforcement. The wet system chimney covers a combination of compatible chimney components, obtained or specified from one manufacturing source with product responsibility for the whole system chimney. NOTE This document does not cover soot fire resistance chimneys.