<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>
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