ifc:IfcAirToAirHeatRecoveryTypeEnum

<xs:simpleType name="IfcAirToAirHeatRecoveryTypeEnum">
  <xs:restriction base="xs:string">
    <xs:enumeration value="fixedplatecounterflowexchanger"/>
    <xs:enumeration value="fixedplatecrossflowexchanger"/>
    <xs:enumeration value="fixedplateparallelflowexchanger"/>
    <xs:enumeration value="rotarywheel"/>
    <xs:enumeration value="runaroundcoilloop"/>
    <xs:enumeration value="heatpipe"/>
    <xs:enumeration value="twintowerenthalpyrecoveryloops"/>
    <xs:enumeration value="thermosiphonsealedtubeheatexchangers"/>
    <xs:enumeration value="thermosiphoncoiltypeheatexchangers"/>
    <xs:enumeration value="userdefined"/>
    <xs:enumeration value="notdefined"/>
  </xs:restriction>
</xs:simpleType>