Certification EN 13084-7 & CE marking.
Official by notified body approved EN 13084-7 is the guaranty that your chimney is designed and fabricated with respect to the EN rules and codes.
For free standing chimneys as well as chimneys attached to a building erected in the EU countries CE marking is mandatory as of the year 2005.
The official name is:
Construction Products Directive 89/106/EEC as amended by 93/68/EEC on EN 13084-7:2005/ AC 2009.