#### 7.1.2.7 IfcDuctSilencerTypeEnum

Enumeration defining the typical types of duct silencers.

Enumerated Item Definitions:

- FLATOVAL: Flat-oval shaped duct silencer type.
- RECTANGULAR: Rectangular shaped duct silencer type.
- ROUND: Round duct silencer type.
- USERDEFINED: User-defined duct silencer type.
- NOTDEFINED: Undefined duct silencer type.

> HISTORY New enumeration in IFC2x2.

XSD Specification:

<xs:simpleType name="IfcDuctSilencerTypeEnum">
<xs:restriction base="xs:string">
<xs:enumeration value="flatoval"/>
<xs:enumeration value="rectangular"/>
<xs:enumeration value="round"/>
<xs:enumeration value="userdefined"/>
<xs:enumeration value="notdefined"/>
</xs:restriction>
</xs:simpleType>

EXPRESS Specification:

TYPE IfcDuctSilencerTypeEnum = ENUMERATION OF (
| FLATOVAL, RECTANGULAR, ROUND, USERDEFINED, NOTDEFINED);
END_TYPE;

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