Pset_HumidifierPHistory Humidifier performance history attributes. Sound attribute deleted in IFC2x2 Pset Addendum: Use IfcSoundProperties instead. IfcHumidifier IfcHumidifier AtmosphericPressure Ambient atmospheric pressure. Atmospheric Pressure 標準大気圧（外気圧） 標準大気圧(外気圧） SaturationEfficiency Saturation efficiency: Ratio of leaving air absolute humidity to the maximum absolute humidity. Saturation Efficiency 飽和比率 飽和比率：最大絶対湿度に対する現在の絶対湿度の割合