Defined in File Ifc4.h
IfcDuctSilencer: public Ifc4::IfcFlowTreatmentDevice¶
A duct silencer is a device that is typically installed inside a duct distribution system for the purpose of reducing the noise levels from air movement, fan noise, etc. in the adjacent space or downstream of the duct silencer device.
HISTORY New entity in IFC2x4
Type Use Definition IfcDuctSilencer defines the occurrence of any duct silencer; common information about duct silencer types is handled by IfcDuctSilencerType. The IfcDuctSilencerType (if present) may establish the common type name, usage (predefined type), properties, materials, ports, composition, assignments, and representations. The IfcDuctSilencerType is attached using the IfcRelDefinesByType objectified relationship and is accessible by the IsTypedBy inverse attribute. If the IfcDuctSilencerType has ports or aggregated elements, such objects are reflected at the IfcDuctSilencer occurrence using the IfcRelDefinesByObject relationship.
Property Use Definition The property sets relating to this entity are defined by IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. They are accessible by the IsDefinedBy inverse attribute. Property sets may also be specified at the IfcDuctSilencerType, defining the common property data for all occurrences of the same type. They are then accessible by the IsTypedBy inverse attribute pointing to IfcDuctSilencerType.HasPropertySets. If both are given, then the properties directly defined at IfcDuctSilencer override the properties defined at IfcDuctSilencerType. Refer to the documentation at the supertype IfcFlowTreatmentDevice and ancestors for inherited property set definitions. The following property set definitions are applicable to this entity: Pset_DuctSilencerPHistory (PSET_PERFORMANCEDRIVEN) Pset_DuctSilencerTypeCommon (PSET_TYPEDRIVENOVERRIDE)
Quantity Use Definition The quantities relating to this entity are defined by IfcElementQuantity and attached by the IfcRelDefinesByProperties relationship. They are accessible by the IsDefinedBy inverse attribute. The following base quantities are defined and shall be exchanged with the IfcElementQuantity.Name = ‘BaseQuantities’. Other quantities, being subjected to local standard of measurement, may be defined with another string value assigned to Name. In this case a valid value for MethodOfMeasurement shall be provided.
Material Use Definition The material of the IfcDuctSilencer is defined by IfcMaterialConstituentSet or as a fallback by IfcMaterial, and attached by the RelatingMaterial attribute on the IfcRelAssociatesMaterial relationship. It is accessible by the HasAssociations inverse attribute. Material information can also be given at the IfcDuctSilencerType, defining the common attribute data for all occurrences of the same type. The following keywords for IfcMaterialConstituentSet.MaterialConstituents[n].Name shall be used:
Body: The primary material from which the object is constructed.
Port Use Definition The distribution ports relating to the IfcDuctSilencer are defined by IfcDistributionPort and attached by the IfcRelConnectsPortToElement relationship. If the duct silencer occurrence is defined by IfcDuctSilencerType, then the port occurrences must reflect those defined at the IfcDuctSilencerType using the IfcRelDefinesByObject relationship. Ports are specific to the IfcDuctSilencer PredefinedType as follows indicated by the IfcDistributionPort Name, PredefinedType, and FlowDirection:
Inlet (NOTDEFINED, SINK): The flow inlet. Outlet (NOTDEFINED, SOURCE): The flow outlet.
Whether the optional attribute PredefinedType is defined for this IfcDuctSilencer.
IfcDuctSilencer(std::string v1_GlobalId, ::Ifc4::IfcOwnerHistory *v2_OwnerHistory, boost::optional<std::string> v3_Name, boost::optional<std::string> v4_Description, boost::optional<std::string> v5_ObjectType, ::Ifc4::IfcObjectPlacement *v6_ObjectPlacement, ::Ifc4::IfcProductRepresentation *v7_Representation, boost::optional<std::string> v8_Tag, boost::optional<::Ifc4::IfcDuctSilencerTypeEnum::Value> v9_PredefinedType)¶