#### 7.1.2.1 IfcAirTerminalBoxTypeEnum

This enumeration identifies different types of air terminal boxes.

Enumerated Item Definitions:

- CONSTANTFLOW: Terminal box does not include a means to reset the volume automatically to an outside signal such as thermostat.
- VARIABLEFLOWPRESSUREDEPENDANT: terminal box includes a means to reset the volume automatically to a different control point in response to an outside signal such as thermostat: air-flow rate depends on supply pressure.
- VARIABLEFLOWPRESSUREINDEPENDANT: terminal box includes a means to reset the volume automatically to a different control point in response to an outside signal such as thermostat: air-flow rate is independant of supply pressure.
- USERDEFINED: User-defined terminal box.
- NOTDEFINED: Undefined terminal box.

> HISTORY New enumeration in IFC2.0.

XSD Specification:

<xs:simpleType name="IfcAirTerminalBoxTypeEnum">
<xs:restriction base="xs:string">
<xs:enumeration value="constantflow"/>
<xs:enumeration value="variableflowpressuredependant"/>
<xs:enumeration value="variableflowpressureindependant"/>
<xs:enumeration value="userdefined"/>
<xs:enumeration value="notdefined"/>
</xs:restriction>
</xs:simpleType>

EXPRESS Specification:

TYPE IfcAirTerminalBoxTypeEnum = ENUMERATION OF (
| CONSTANTFLOW, VARIABLEFLOWPRESSUREDEPENDANT, VARIABLEFLOWPRESSUREINDEPENDANT, USERDEFINED, NOTDEFINED);
END_TYPE;

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