Plumbing connections accessories..................................................................................................................................................................................................................27Water trap with ball (option).......................................................................................................................................................................................................................27Water heating element for after-heating (accessory) - duct mounted......................................................................................................28Ventilation installationDuct system.............................................................................................................................................................................................................................................................................. 30Legislation...................................................................................................................................................................................................................................................................... 30Ducts..................................................................................................................................................................................................................................................................................... 30Unit..........................................................................................................................................................................................................................................................................................30Extract air........................................................................................................................................................................................................................................................................31Supply air......................................................................................................................................................................................................................................................................... 31Roof stacks.................................................................................................................................................................................................................................................................... 31Installation example.............................................................................................................................................................................................................................................32Balancing...................................................................................................................................................................................................................................................................................... 33Important information...................................................................................................................................................................................................................................... 33Comfort 200 Top (English) BY NILAN3