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.

7.1.3.3.2 Entity inheritance

1. • IfcRoot
2. • IfcPropertyDefinition
   • IfcObjectDefinition
   • IfcRelationship
3. • IfcPropertySetDefinition
   • IfcPropertyTemplateDefinition
4. • IfcPreDefinedPropertySet
   • IfcPropertySet
   • IfcQuantitySet
5. • IfcPermeableCoveringProperties
   • IfcDoorLiningProperties
   • IfcDoorPanelProperties
   • IfcReinforcementDefinitionProperties
   • IfcWindowLiningProperties
   • IfcWindowPanelProperties

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	Reference to the relationship IfcRelDeclares and thus to the IfcProject or IfcProjectLibrary.
	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.
Click to show 9 hidden inherited attributes Click to hide 9 inherited attributes
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.

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.
Click to show 2 hidden inherited concepts Click to hide 2 inherited concepts

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

• IfcPreDefinedPropertySet