enum IfcFanPressureClassEnum {
kIfcFanPressureClassEnum_CLASS1,
kIfcFanPressureClassEnum_CLASS2,
kIfcFanPressureClassEnum_CLASS3,
kIfcFanPressureClassEnum_CLASS4,
kIfcFanPressureClassEnum_OTHER,
kIfcFanPressureClassEnum_NOTKNOWN,
kIfcFanPressureClassEnum_UNSET,
kIfcFanPressureClassEnum_unset
};