#### 7.1.2.2 IfcAirTerminalTypeEnum

Enumeration defining the functional types of air terminals.

Enumerated Item Definitions:

- GRILLE: A covering for any area through which air passes.
- REGISTER: A grille typically equipped with a damper or control valve.
- DIFFUSER: An outlet discharging supply air in various directions and planes.
- LOUVRE: A rectilinear louvre.
- USERDEFINED: User-defined air terminal type.
- NOTDEFINED: Undefined air terminal type.

> NOTE Architectural louvres within doors or windows are defined by IfcPermeableCoveringProperties.

> HISTORY New enumeration in IFC2x2. Modified in IFC4 to add LOUVRE and remove EYEBALL, IRIS, LINEARGRILLE, LINEARDIFFUSER.

XSD Specification:

<xs:simpleType name="IfcAirTerminalTypeEnum">
<xs:restriction base="xs:string">
<xs:enumeration value="diffuser"/>
<xs:enumeration value="grille"/>
<xs:enumeration value="louvre"/>
<xs:enumeration value="register"/>
<xs:enumeration value="userdefined"/>
<xs:enumeration value="notdefined"/>
</xs:restriction>
</xs:simpleType>

EXPRESS Specification:

TYPE IfcAirTerminalTypeEnum = ENUMERATION OF (
| DIFFUSER, GRILLE, LOUVRE, REGISTER, USERDEFINED, NOTDEFINED);
END_TYPE;

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