DS EN 14989-1:2007 Chimneys - Requirements And Test Methods For Metal Chimneys And Material Independent Air Supply Ducts For Roomsealed Heating Applications - Part 1: Vertical Air/Flue Terminals For C6-Type Appliances Defines the requirements and test methods for positive pressure air/flue terminals with metal flue ducts for C62- and C63-type gas appliances, which convey air for combustion, and the products of comb