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; German version EN 14989-1:2007— 64 стр.
Contract Procedure for Building Works; Part C: General Technical Specifications for Building Works; Systems for Central Heating and Central Raw Water Heating— 21 стр.