I was trying to filter out all the pipes/ducts networks in my project but could not think of anything.
By network, I mean the connected pipe/duct elements.
Please have a look at the dynamo script below, I think it is what you are looking for.
Hi, where can I find this node “PipingSystem all elements in network”?
technically, you can just get all the elements you want and group them together by their MEPSystemName.