ČSN EN 16497-1

This European Standard specifies the materials and the dimensional and performance requirements for straight concrete system chimneys for non-balanced flue applications comprising a concrete flue liner and a combination of compatible chimney components, which may be concrete flue blocks, obtained or specified from one manufacturing source with product responsibility for the whole chimney.
This European Standard does not apply to concrete system chimneys with back ventilation.
This European Standard does not cover products designated wet (W) in conjunction with corrosion class 3.
This European Standard also applies to concrete system chimneys constructed from storey-height elements and flue blocks reinforced for handling.
NOTE: Any reference to the term flue blocks implies both flue blocks and their fittings, except where otherwise indicated.