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EN 1856:2009 Chimneys - Requirements for metal chimneys - Part 1: System chimney products
and Part 2: Metal flue liners and connecting flue pipes

Up-to date information, and printed copies, can be purchased from National Standards Organizations, such as: BSI or NSAI, or your local library may offer online access at no direct cost to you. See also Test Laboratories, Standards and CE Marking.

Among other provisions this Europe-wide EN Standards, lays down standards and methods of test for both insulated chimneys and connecting flue pipes, including flexible flue liners, leading to a CE mark and a product marking like:

EN 1856-1:2009 T450 - N1 - D - V3 - G 100

Temperature Class: Indicating the normal operating temperature in ºC (T80, 100, 120, 140, 160, 200, 250, 300, 400, 450, 600) T450 or above is appropriate for solid fuel use.
Pressure Class: Indicating the gas tightness at pressure. SF chimneys are normally under very low negative pressure, so the lowest class N1 (of N1, N2, P1, P2, H1, H2) is suitable.
Condensate Resistance Class: Resistance to condensation can be W=Wet or D=Dry. For almost all solid fuel use 'D' will do, but installations using wet wood or where the appliance is over about 90% efficiency are likely to suffer condensation inside the chimney so that the 'W' standard is required.
Corrosion Resistance: The standard lays down a 'V' classification of corrosion resistance. At least V2 for open fires, V3 for closed appliances.
Soot fire resistance: Solid fuel appliances require category 'G' -with soot fire resistance (O = without), the standard requires the addition of a figure for the distance from the metal pipe to combustible materials under soot fire conditions.

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