IFC 4.3.0.1 (IFC4X3) development

7.1.3.3 IfcPermeableCoveringProperties

7.1.3.3.1 Semantic definition

This entity is a description of a panel within a door or window (as fillers for opening) which allows for air flow. It is given by its properties (IfcPermeableCoveringProperties). A permeable covering is a casement, such as a component, fixed or opening, consisting essentially of a frame and the infilling. The infilling is normally a grill, a louver or a screen. The way of operation is defined in the operation type.

The IfcPermeableCoveringProperties are included in the list of properties (HasPropertySets) of the IfcWindowType or the IfcDoorType. More information about the permeable covering can be included in the same list of the window or door style using the IfcPropertySet for dynamic extensions. This particularly applies for additional properties for the various operation types

The IfcPermeableCoveringProperties does not hold a geometric representation. However it defines parameters which can be used to create the shape of the IfcWindowType (which is inserted by the IfcWindow into the spatial context of the project), or of the IfcDoorType (which is inserted by the IfcDoor).

The parameters at the IfcPermeableCoveringProperties define a standard permeable covering. The outer boundary of the panel is determined by the occurrence parameter assigned to the IfcWindow or IfcDoor. It has to take the lining parameter into account as well. The position of the permeable covering within the overall window or door is determined by the PanelPosition attribute.

Figure 7.1.3.3.A illustrates the panel applied to the position within the lining, as defined by the panel position attribute. The following parameters apply to that panel: FrameDepth, FrameThickness.

covering
Figure 7.1.3.3.A — Permeable covering properties

7.1.3.3.2 Entity inheritance

7.1.3.3.3 Attributes

# Attribute Type Description
IfcRoot (4)
1 GlobalId IfcGloballyUniqueId

Assignment of a globally unique identifier within the entire software world.

2 OwnerHistory OPTIONAL IfcOwnerHistory

Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object,

3 Name OPTIONAL IfcLabel

Optional name for use by the participating software systems or users. For some subtypes of IfcRoot the insertion of the Name attribute may be required. This would be enforced by a where rule.

4 Description OPTIONAL IfcText

Optional description, provided for exchanging informative comments.

IfcPropertyDefinition (2)
HasContext SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions

No description available.

HasAssociations SET [0:?] OF IfcRelAssociates FOR RelatedObjects

Reference to the relationship IfcRelAssociates and thus to those externally defined concepts, like classifications, documents, or library information, which are associated to the property definition.

IfcPropertySetDefinition (3)
DefinesType SET [0:?] OF IfcTypeObject FOR HasPropertySets

The type object to which the property set is assigned. The property set acts as a shared property set to all occurrences of the type object.

IsDefinedBy SET [0:?] OF IfcRelDefinesByTemplate FOR RelatedPropertySets

Relation to the property set template, via the objectified relationship IfcRelDefinesByTemplate, that, if given, provides the definition template for the property set or quantity set and its properties.

DefinesOccurrence SET [0:?] OF IfcRelDefinesByProperties FOR RelatingPropertyDefinition

Reference to the relation to one or many object occurrences that are characterized by the property set definition. A single property set can be assigned to multiple object occurrences using the objectified relationship IfcRefDefinesByProperties.

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IfcPermeableCoveringProperties (5)
5 OperationType IfcPermeableCoveringOperationEnum

Types of permeable covering operations. Also used to assign standard symbolic presentations according to national building standards.

6 PanelPosition IfcWindowPanelPositionEnum

Position of this permeable covering panel within the overall window or door type.

7 FrameDepth OPTIONAL IfcPositiveLengthMeasure

Depth of panel frame (used to include the permeable covering), measured from front face to back face horizontally (i.e. perpendicular to the window or door (elevation) plane.

8 FrameThickness OPTIONAL IfcPositiveLengthMeasure

Width of panel frame (used to include the permeable covering), measured from inside of panel (at permeable covering) to outside of panel (at lining), i.e. parallel to the window or door (elevation) plane.

9 ShapeAspectStyle OPTIONAL IfcShapeAspect

Optional link to a shape aspect definition, which points to the part of the geometric representation of the window style, which is used to represent the permeable covering.

Table 7.1.3.3.B

7.1.3.3.4 Concept usage

Concept Usage Description
IfcRoot (2)
Revision Control General

Ownership, history, and merge state is captured using IfcOwnerHistory.

Software Identity General

IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept.

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Table 7.1.3.3.C

7.1.3.3.5 Formal representation

ENTITY IfcPermeableCoveringProperties
 SUBTYPE OF (IfcPreDefinedPropertySet);
	OperationType : IfcPermeableCoveringOperationEnum;
	PanelPosition : IfcWindowPanelPositionEnum;
	FrameDepth : OPTIONAL IfcPositiveLengthMeasure;
	FrameThickness : OPTIONAL IfcPositiveLengthMeasure;
	ShapeAspectStyle : OPTIONAL IfcShapeAspect;
END_ENTITY;

7.1.3.3.6 References

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7.1.3.3.7 Changelog