#### 7.1.2.10 IfcFanTypeEnum

Enumeration defining the typical types of fans.

Enumerated Item Definitions:

- CENTRIFUGALFORWARDCURVED: Air flows through the impeller radially using blades that are forward curved.
- CENTRIFUGALRADIAL: Air flows through the impeller radially using blades that are uncurved or slightly forward curved.
- CENTRIFUGALBACKWARDINCLINEDCURVED: Air flows through the impeller radially using blades that are backward curved.
- CENTRIFUGALAIRFOIL: Air flows through the impeller radially using blades that are airfoil shaped.
- TUBEAXIAL: Air flows through the impeller axially with reduced tip clearance and operating at higher tip speeds.
- VANEAXIAL: Air flows through the impeller axially with guide vanes and reduced running blade tip clearance.
- PROPELLORAXIAL: Air flows through the impeller axially and small hub-to-tip ratio impeller mounted in an orifice plate or inlet ring.
- USERDEFINED: User-defined fan type.
- NOTDEFINED: Undefined fan type.

> HISTORY New enumeration in IFC2x2.

XSD Specification:

<xs:simpleType name="IfcFanTypeEnum">
<xs:restriction base="xs:string">
<xs:enumeration value="centrifugalforwardcurved"/>
<xs:enumeration value="centrifugalradial"/>
<xs:enumeration value="centrifugalbackwardinclinedcurved"/>
<xs:enumeration value="centrifugalairfoil"/>
<xs:enumeration value="tubeaxial"/>
<xs:enumeration value="vaneaxial"/>
<xs:enumeration value="propelloraxial"/>
<xs:enumeration value="userdefined"/>
<xs:enumeration value="notdefined"/>
</xs:restriction>
</xs:simpleType>

EXPRESS Specification:

TYPE IfcFanTypeEnum = ENUMERATION OF (
| CENTRIFUGALFORWARDCURVED, CENTRIFUGALRADIAL, CENTRIFUGALBACKWARDINCLINEDCURVED, CENTRIFUGALAIRFOIL, TUBEAXIAL, VANEAXIAL, PROPELLORAXIAL, USERDEFINED, NOTDEFINED);
END_TYPE;

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