How to represent fans for external air intake in openstudio?

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Have you looked at the VRF with DOAS measure in BCL? Working with VRF also typically requires a separate air loop that handles outside air only (DOAS). That loop typically has cooling and heating coils in addition to a fan. Providing outside air typically requires heating and cooling, but I suppose if you must, you could just keep the fan and delete the coils. In general, I think if you search this forum for VRF, you‘ll find what you need.