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IfcDuctSilencerTypeEnum

Definition from IAI: Enumeration defining the typical types of duct silencers. The IfcDuctSilencerTypeEnum contains the following:

HISTORY: New enumeration in IFC 2x2.

EXPRESS specification:

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