@Benoit, Harf, so the speedpack is not a tool that will be useful to me because in fact, all the faces of my building are likely to be used to position my ducts!!
@gt22, And for piping, what you describe to me strongly resembles mechanically welded when you talk about a stretched circular / rectangular sketch ;-)
Personally, I use mechanically welded for my networks. I integrate some library functions for parts such as reductions, registers... And that's it!