Currently, air walls are translated to a single layer of drywall in EnergyPlus simulation:

https://github.com/NREL/OpenStudio/blob/3aaa0984dbc185867261bde6305b141deb118d5e/openstudiocore/src/energyplus/ForwardTranslator/ForwardTranslateAirWallMaterial.cpp#L45

The grand plan in OpenStudio is to eventually add parameters to the OS:AirWallMaterial such as:

• Create Interior Window (True/False)
• Zone Mixing Per Area (m^3/s*m^2)
• EnergyPlus Simulation Material (Name of other material)

These parameters would control how air walls are translated to EnergyPlus. However, we have not gotten to this yet.