DS EN 14989-2:2008 Chimneys - Requirements And Test Methods For Metal Chimneys And Material Independent Air Supply Ducts For Roomsealed Heating Applications - Part 2: Flue And Air Supply Ducts For Room Sealed Appliances Defines requirements and test methods for metal flue ducts material independent air supply ducts for room sealed appliances. It also specifies the requirements for marking, manufacturer's instruction,