7.5.3.29 IfcDuctSilencer

Silencieux circulaire
Kanalschalldämpfer

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 IFC4

Common Use Definitions

The following concepts are inherited at supertypes:

 Instance diagram

Object Typing

The Object Typing concept applies to this entity as shown in Table 503.
Type
IfcDuctSilencerType
IfcDistributionFlowElementType
IfcDistributionElementType

Table 503 — IfcDuctSilencer Object Typing



Property Sets for Objects

The Property Sets for Objects concept applies to this entity as shown in Table 504.
PredefinedTypeName
 Pset_DuctSilencerPHistory
 Pset_DuctSilencerTypeCommon
 Pset_SoundGeneration
 Pset_ElectricalDeviceCommon
 Pset_Condition
 Pset_EnvironmentalImpactIndicators
 Pset_EnvironmentalImpactValues
 Pset_ManufacturerOccurrence
 Pset_ManufacturerTypeInformation
 Pset_PackingInstructions
 Pset_ServiceLife
 Pset_Warranty

Table 504 — IfcDuctSilencer Property Sets for Objects



Quantity Sets

The Quantity Sets concept applies to this entity as shown in Table 505.
Name
Qto_DuctSilencerBaseQuantities

Table 505 — IfcDuctSilencer Quantity Sets



Material Constituents

The Material Constituents concept applies to this entity as shown in Table 506.
NameDescription
CasingMaterial from which the casing is constructed.

Table 506 — IfcDuctSilencer Material Constituents



Port Nesting

The Port Nesting concept applies to this entity as shown in Table 507.
PredefinedTypeNameFlowTypeDescription
 InletSINKAIRCONDITIONINGThe flow inlet.
 OutletSOURCEAIRCONDITIONINGThe flow outlet.

Table 507 — IfcDuctSilencer Port Nesting




XSD Specification:

 <xs:element name="IfcDuctSilencer" type="ifc:IfcDuctSilencer" substitutionGroup="ifc:IfcFlowTreatmentDevice" nillable="true"/>
 <xs:complexType name="IfcDuctSilencer">
  <xs:complexContent>
   <xs:extension base="ifc:IfcFlowTreatmentDevice">
    <xs:attribute name="PredefinedType" type="ifc:IfcDuctSilencerTypeEnum" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>

EXPRESS Specification:

ENTITY IfcDuctSilencer
SUBTYPE OF IfcFlowTreatmentDevice;
PredefinedType : OPTIONAL IfcDuctSilencerTypeEnum;
WHERE
CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR (PredefinedType <> IfcDuctSilencerTypeEnum.USERDEFINED) OR ((PredefinedType = IfcDuctSilencerTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
CorrectTypeAssigned : (SIZEOF(IsTypedBy) = 0) OR ('IFCHVACDOMAIN.IFCDUCTSILENCERTYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType));
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

Formal Propositions:

CorrectPredefinedType : Either the PredefinedType attribute is unset (e.g. because an IfcDuctSilencerType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED.
CorrectTypeAssigned : Either there is no duct silencer type object associated, i.e. the IsTypedBy inverse relationship is not provided, or the associated type object has to be of type IfcDuctSilencerType.

Inheritance Graph:

ENTITY IfcDuctSilencer
ENTITY IfcRoot
GlobalId : IfcGloballyUniqueId;
OwnerHistory : OPTIONAL IfcOwnerHistory;
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
ENTITY IfcObjectDefinition
INVERSE
HasAssignments : SET OF IfcRelAssigns FOR RelatedObjects;
Nests : SET [0:1] OF IfcRelNests FOR RelatedObjects;
IsNestedBy : SET OF IfcRelNests FOR RelatingObject;
HasContext : SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions;
IsDecomposedBy : SET OF IfcRelAggregates FOR RelatingObject;
Decomposes : SET [0:1] OF IfcRelAggregates FOR RelatedObjects;
HasAssociations : SET OF IfcRelAssociates FOR RelatedObjects;
ENTITY IfcObject
ObjectType : OPTIONAL IfcLabel;
INVERSE
IsDeclaredBy : SET [0:1] OF IfcRelDefinesByObject FOR RelatedObjects;
Declares : SET OF IfcRelDefinesByObject FOR RelatingObject;
IsTypedBy : SET [0:1] OF IfcRelDefinesByType FOR RelatedObjects;
IsDefinedBy : SET OF IfcRelDefinesByProperties FOR RelatedObjects;
ENTITY IfcProduct
ObjectPlacement : OPTIONAL IfcObjectPlacement;
Representation : OPTIONAL IfcProductRepresentation;
INVERSE
ReferencedBy : SET OF IfcRelAssignsToProduct FOR RelatingProduct;
ENTITY IfcElement
Tag : OPTIONAL IfcIdentifier;
INVERSE
FillsVoids : SET [0:1] OF IfcRelFillsElement FOR RelatedBuildingElement;
ConnectedTo : SET OF IfcRelConnectsElements FOR RelatingElement;
IsInterferedByElements : SET OF IfcRelInterferesElements FOR RelatedElement;
InterferesElements : SET OF IfcRelInterferesElements FOR RelatingElement;
HasProjections : SET OF IfcRelProjectsElement FOR RelatingElement;
ReferencedInStructures : SET OF IfcRelReferencedInSpatialStructure FOR RelatedElements;
HasOpenings : SET OF IfcRelVoidsElement FOR RelatingBuildingElement;
IsConnectionRealization : SET OF IfcRelConnectsWithRealizingElements FOR RealizingElements;
ProvidesBoundaries : SET OF IfcRelSpaceBoundary FOR RelatedBuildingElement;
ConnectedFrom : SET OF IfcRelConnectsElements FOR RelatedElement;
ContainedInStructure : SET [0:1] OF IfcRelContainedInSpatialStructure FOR RelatedElements;
ENTITY IfcDistributionElement
INVERSE
HasPorts : SET OF IfcRelConnectsPortToElement FOR RelatedElement;
ENTITY IfcDistributionFlowElement
INVERSE
HasControlElements : SET [0:1] OF IfcRelFlowControlElements FOR RelatingFlowElement;
ENTITY IfcFlowTreatmentDevice
ENTITY IfcDuctSilencer
PredefinedType : OPTIONAL IfcDuctSilencerTypeEnum;
END_ENTITY;

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