How to model a return fan in Ironbug

I have checked the ironbug github, this forum, and the hydra websites for an example of a VAV system with supply and return fans but haven’t found anything yet. I’m assuming that it goes on the “Demand” input of the Airloop object, but I wasn’t sure how to merge it in with the other demand components. I’m guessing it has to do with the branches object.

Is there any documentation for ironbug?

Typically we model return fan at supply side. A fan is added before the OA will be return fan.
Hope this helps.

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Thanks for the quick reply. That makes sense. I’ll definitely double check how it would be done in OpenStudio moving forward. Thanks. By the way, how do I mark your post as the solution?

One other thing, do you know how to add an input to the top of the Merge object in grasshopper so that I can insert a return fan before the OASystem without having to shift everything down one first?