IfcPermeableCoveringProperties

Definition from BS 6100: A permeable covering is a permeable cover for an opening which allows airflow .

Definition from IAI: 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, i.e. 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 IfcWindowStyle or the IfcDoorStyle. 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

> HISTORY New entity in IFC Release 2.0, it had been renamed from IfcPermeableCovering in IFC Release 2x.

Geometry Use Definitions

The IfcPermeableCoveringProperties does not hold an own geometric representation. However it defines parameter, which can be used to create the shape of the IfcWindowStyle (which is inserted by the IfcWindow into the spatial context of the project), or of the IfcDoorStyle (which is inserted by the IfcDoor).

Interpretation of parameter

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.

| The panel is applied to the position within the lining, as defined by the panel position attribute. The following parameter apply to that panel: FrameDepth FrameThickness

EXPRESS specification:

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

Attribute definitions:

OperationType | : | Types of permeable covering operations. Also used to assign standard symbolic presentations according to national building standards.
PanelPosition | : | Position of this permeable covering panel within the overall window or door type.
FrameDepth | : | 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.
FrameThickness | : | 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.
ShapeAspectStyle | : | 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.

Inheritance graph

ENTITY IfcPermeableCoveringProperties;
ENTITY IfcRoot;
GlobalId | : | IfcGloballyUniqueId;
OwnerHistory | : | IfcOwnerHistory;
Name | : | OPTIONAL IfcLabel;
Description | : | OPTIONAL IfcText;
ENTITY IfcPropertyDefinition;
INVERSE
HasAssociations | : | SET OF IfcRelAssociates FOR RelatedObjects;
ENTITY IfcPropertySetDefinition;
INVERSE
PropertyDefinitionOf | : | SET [0:1] OF IfcRelDefinesByProperties FOR RelatingPropertyDefinition;
DefinesType | : | SET [0:1] OF IfcTypeObject FOR HasPropertySets;
ENTITY IfcPermeableCoveringProperties;
OperationType | : | IfcPermeableCoveringOperationEnum;
PanelPosition | : | IfcWindowPanelPositionEnum;
FrameDepth | : | OPTIONAL IfcPositiveLengthMeasure;
FrameThickness | : | OPTIONAL IfcPositiveLengthMeasure;
ShapeAspectStyle | : | OPTIONAL IfcShapeAspect;
END_ENTITY;