IfcDuctSilencerType

Definition from IAI: The element type IfcDuctSilencerType defines a list of commonly shared property set definitions of a duct silencer and an optional set of product representations. It is used to define a duct silencer specification (i.e. the specific product information, that is common to all occurrences of that product type).

> NOTE: The product representations are defined as representation maps (at the level of the supertype IfcTypeProduct, which get assigned by an element occurrence instance through the IfcShapeRepresentation.Item[1] being an IfcMappedItem.

A duct silencer type is used to define the common properties of a duct silencer that may be applied to many occurrences of that type. 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. Duct silencer types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences.

The occurrences of the IfcDuctSilencerType are represented by instances of IfcFlowTreatmentDevice or its subtypes.

Property Set Use Definition:

The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release:

- Pset_DuctSilencerTypeCommon: common property set for all duct silencer types

> HISTORY: New entity in IFC Release 2x2.

EXPRESS specification:

ENTITY IfcDuctSilencerType
SUBTYPE OF ( | IfcFlowTreatmentDeviceType);
PredefinedType | : | IfcDuctSilencerTypeEnum;
WHERE
WR1 | : | (PredefinedType <> IfcDuctSilencerTypeEnum.USERDEFINED) OR ((PredefinedType = IfcDuctSilencerTypeEnum.USERDEFINED) AND EXISTS(SELF\IfcElementType.ElementType));
END_ENTITY;

Attribute definitions:

PredefinedType | : | The type of duct silencer.

Inheritance graph

ENTITY IfcDuctSilencerType;
ENTITY IfcRoot;
GlobalId | : | IfcGloballyUniqueId;
OwnerHistory | : | IfcOwnerHistory;
Name | : | OPTIONAL IfcLabel;
Description | : | OPTIONAL IfcText;
ENTITY IfcObjectDefinition;
INVERSE
HasAssignments | : | SET OF IfcRelAssigns FOR RelatedObjects;
IsDecomposedBy | : | SET OF IfcRelDecomposes FOR RelatingObject;
Decomposes | : | SET [0:1] OF IfcRelDecomposes FOR RelatedObjects;
HasAssociations | : | SET OF IfcRelAssociates FOR RelatedObjects;
ENTITY IfcTypeObject;
ApplicableOccurrence | : | OPTIONAL IfcLabel;
HasPropertySets | : | OPTIONAL SET [1:?] OF IfcPropertySetDefinition;
INVERSE
ObjectTypeOf | : | SET [0:1] OF IfcRelDefinesByType FOR RelatingType;
ENTITY IfcTypeProduct;
RepresentationMaps | : | OPTIONAL LIST [1:?] OF UNIQUE IfcRepresentationMap;
Tag | : | OPTIONAL IfcLabel;
ENTITY IfcElementType;
ElementType | : | OPTIONAL IfcLabel;
ENTITY IfcDistributionElementType;
ENTITY IfcDistributionFlowElementType;
ENTITY IfcFlowTreatmentDeviceType;
ENTITY IfcDuctSilencerType;
PredefinedType | : | IfcDuctSilencerTypeEnum;
END_ENTITY;