This European Standard specifies the material, dimensional and performance requirements for factory made concrete outer wall elements for chimneys including fittings. The standard covers elements having up to four passages designated to accommodate a combination of flue liners and or air ducts. This European Standard also relates to storey-height and reinforced outer wall elements. NOTE 1 Classes in this standard are not derived from conditions referred to in article 3.2 of Directive 89/106/EC and should only be considered as technical classes in the sense of Commission Guidance Paper E "Levels and classes in the Construction Products Directive”. NOTE 2 Any reference to the term ‘outer wall element’ implies both the outer wall elements and their fittings, except where otherwise indicated.