Volume damper placement

Revit API
1

Is it possible, to automatically place volume damper in every air terminal branch ducts?

I tried many python codes, but still didn’t work.

I appreciate your help.

2

Please read the intro post for newbie.

3

and please, no double post here and on the dynamo forum. Don’t bother the whole community at once. If one does not work after a few days, then go ahead and ask in the other, but generally you need to try for yourself with an approach and then show and ask.