#### 7.1.2.6 IfcDamperTypeEnum

This enumeration defines the various types of damper

Enumerated Item Definitions:

- BALANCINGDAMPER: Damper used for purposes of manually balancing pressure differences. Commonly operated by mechanical adjustment.
- BACKDRAFTDAMPER: Backdraft damper used to restrict the movement of air in one direction. Commonly operated by mechanical spring.
- BLASTDAMPER: Blast damper used to prevent protect occupants and equipment against overpressures resultant of an explosion. Commonly operated by mechanical spring.
- CONTROLDAMPER: Control damper used to modulate the flow of air by adjusting the position of the blades. Commonly operated by an actuator of a building automation system.
- FIREDAMPER: Fire damper used to prevent the spread of fire for a specified duration. Commonly operated by fusable link that melts above a certain temperature.
- FIRESMOKEDAMPER: Combination fire and smoke damper used to preven the spread of fire and smoke. Commonly operated by a fusable link and a smoke detector
- FUMEHOODEXHAUST: Fume hood exhaust damper. Commonly operated by actuator.
- GRAVITYDAMPER: Gravity damper closes from the force of gravity. Commonly operated by gravitational weight.
- GRAVITYRELIEFDAMPER: Gravity-relief damper used to allow air to move upon a buildup of enough pressure to overcome the gravitational force exerted upon the damper blades. Commonly operated by gravitational weight.
- RELIEFDAMPER: Relief damper used to allow air to move upon a buildup of a specified pressure differential. Commonly operated by mechanical spring.
- SMOKEDAMPER: Smoke damper used to prevent the spread of smoke. Commonly operated by a smoke detector of a building automation system.
- USERDEFINED: User-defined damper.
- NOTDEFINED: Undefined damper.

> HISTORY New enumeration in IFC2.0.

XSD Specification:

<xs:simpleType name="IfcDamperTypeEnum">
<xs:restriction base="xs:string">
<xs:enumeration value="backdraftdamper"/>
<xs:enumeration value="balancingdamper"/>
<xs:enumeration value="blastdamper"/>
<xs:enumeration value="controldamper"/>
<xs:enumeration value="firedamper"/>
<xs:enumeration value="firesmokedamper"/>
<xs:enumeration value="fumehoodexhaust"/>
<xs:enumeration value="gravitydamper"/>
<xs:enumeration value="gravityreliefdamper"/>
<xs:enumeration value="reliefdamper"/>
<xs:enumeration value="smokedamper"/>
<xs:enumeration value="userdefined"/>
<xs:enumeration value="notdefined"/>
</xs:restriction>
</xs:simpleType>

EXPRESS Specification:

TYPE IfcDamperTypeEnum = ENUMERATION OF (
| BACKDRAFTDAMPER, BALANCINGDAMPER, BLASTDAMPER, CONTROLDAMPER, FIREDAMPER, FIRESMOKEDAMPER, FUMEHOODEXHAUST, GRAVITYDAMPER, GRAVITYRELIEFDAMPER, RELIEFDAMPER, SMOKEDAMPER, USERDEFINED, NOTDEFINED);
END_TYPE;

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