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In OpenStudio when I assign multiple spaces into one thermal zone, in the exported IDF, the partition walls between these spaces gets merged into "InternalMass" in EnergyPlus. However, looks like the "SurfaceArea" of the InternalMass is only one wall area. Since EnergyPlus asks for the "total surface area exposed to the zone air" should that be two times the original wall area since both sides of the partition wall are exposed to the zone air?

In OpenStudio when I assign multiple spaces into one thermal zone, in the exported IDF, the partition walls between these spaces gets merged into "InternalMass" in EnergyPlus. However, looks like the "SurfaceArea" of the InternalMass is only one wall area. Since EnergyPlus asks for the "total surface area exposed to the zone air" should that be two times the original wall area since both sides of the partition wall are exposed to the zone air?