And I have got the one question more.
How can I automaticlly add the dampers on the ducts, where is needed?
And please for helping for all my questions if possibly. I have to give this project on the study and I don't want to start everything for beginning in CADvent (I know CADvent, but I want to do it on Revit and I want to learn Revit as well). I have tried to find out the answers for my questions for several days but now I don't find.