How do you add Joint in duct work that represents the joint between each duck length?
In Auto cad this is fairly easy, you can specify how long each peice of duct is with duct length and it will break it to how ever long you want your individual piece of duct to be.
please let me Know.
Automatically you cant. But you can do it manually using duct unions.
There is however a third party application that can do what ask. http://www.youtube.com/watch?v=PdliBu3sa8I
I tried it, but they couldnt get it to work on my machine for some unkown reason.
Revit MEP 2013