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Is this picture something like what you are describing?

image description

Is this picture something like what you are describing?

image description

If so, you can model the transfer air via the ZoneMixing object. Unfortunately, this object is currently isn't available in the GUI, so you'll need to add it via a Measure. Something like this:

# Create a zone mixing object in air_to_zone
zone_mixing = OpenStudio::Model::ZoneMixing.new(air_to_zone)
# Tell it where to pull the air from
zone_mixing.setSourceZone(air_from_zone)
# Set the flow rate and the schedule
zone_mixing.setDesignFlowRate(OpenStudio.convert(200,'cfm','m^3/s').get)
zone_mixing.setSchedule(transfer_air_schedule)