Chimneys – Connecting flue pipes for heat generating systems – Metal pipes and fittings for flue gases from domestic heat generating systems for operation under negative pressure conditions
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/2008

Chimneys – Connecting flue pipes for heat generating systems – Metal pipes and fittings for flue gases from domestic heat generating systems for operation under negative pressure conditions
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/2015