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If what you're looking for is a diagram of Airflow Newtork (AFN) object connections defined in the IDF, similar to the SVG output file that diagrams HVAC connections in the IDF, then you're out of luck. I imagine that this would be a large undertaking, since there is a combination of AFN objects that are abstract and define controls and other non-physical parameters, which don't really have a great place to be shown in diagrams, as well as AFN objects that do represent a physical aspect of the model (ducting, holes in surface, etc.). Those physical aspects should really be overlaid on the model's geometry in order to help illustrate what they are doing, which is the real crux of the problem.

Perhaps someday an EnergyPlus interface will provide this capability, but in the meantime, if you feel that this should be a new feature of EnergyPlus you should create a feature request on the EnergyPlus Github and ask others to vote for that with a "thumbs up" to let the development team know that users would find it useful.

Perhaps your best resource to understand how AFN objects are linked together in general is the figure in the IO Ref that shows Relationships among AFN objects.

Usually, if the IO Ref doesn't contain diagrams to explain various input fields, then the next best place to look is the Engineering Reference. However, for the Airflow Network (AFN) model, the Engineering Reference contains diagrams about different potential flow processes that it can accommodate and not how the specific AFN objects defined in the IDF are are used in the flow process calucalations. Searching for "airflow network" in the other documentation files that come with EnergyPlus turns up a section of the .eio output file that contains some descriptions of AFN controls and wind direction/pressure coefficients, but again no diagrams.