IfcDuctSilencerTypeEnum

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.

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;