6.1.3.44 IfcWindow
6.1.3.44.1 Semantic definition
The window is a building element that is predominately used to provide natural light and fresh air. It includes vertical opening but also horizontal opening such as skylights or light domes. It includes constructions with swinging, pivoting, sliding, or revolving panels and fixed panels. A window consists of a lining and one or several panels. A window can:
- be a "free standing" window, contained in an IfcSpatialElement such as an IfcBuildingStorey.
- fill an opening, typically in a wall. The window will then have a FillsVoids attribute which uses the IfcRelFillsElement relationship to relate the IfcWindow with the IfcOpeningElement;
- be part of an element assembly, typically an IfcCurtainWall. The window will then have a Decomposes attribute which uses the the IfcRelAggregates relationship to relate the window with the assembly of elements;
There are two main representations for window occurrences:
- IfcWindow entities that have a 3D rectangle 'Profile' shape representation defined. This profile can then be used to parametrically generate the geometry of a window. If not provided, the profile of the IfcOpeningElement can be used if the window fills an opening. The parameters are specified on the relating IfcWindowType that references IfcWindowLiningProperties and IfcWindowPanelProperties for each panel in the window;
- IfcWindow entities that are not parametrically generated and have only 'Brep', or 'SurfaceModel' geometry.
In addition, an IfcWindow may commonly include a 'FootPrint' representation defining the 2D shape of the window and its swing.
- the window width and height
- the window opening direction (by the positive y-axis of the ObjectPlacement)
The IfcWindowType specifies parameters which are common to all of its occurrences of IfcWindow:
- the partitioning type (single panel, double panel, triple panel, more panels)
- the operation type (swing, tilt and turn, pivot revolve, fixed casement, etc.)
- the window panel hinge side (by using two different styles for right and left opening windows)
- the particular attributes for the lining by the IfcWindowLiningProperties
- the particular attributes for the panels by the IfcWindowPanelProperties
6.1.3.44.2 Entity inheritance
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- IfcWindow
- IfcBeam
- IfcBearing
- IfcBuildingElementProxy
- IfcChimney
- IfcColumn
- IfcCourse
- IfcCovering
- IfcCurtainWall
- IfcDeepFoundation
- IfcDoor
- IfcEarthworksElement
- IfcFooting
- IfcKerb
- IfcMember
- IfcMooringDevice
- IfcNavigationElement
- IfcPavement
- IfcPlate
- IfcRail
- IfcRailing
- IfcRamp
- IfcRampFlight
- IfcRoof
- IfcShadingDevice
- IfcSlab
- IfcStair
- IfcStairFlight
- IfcTrackElement
- IfcWall
6.1.3.44.3 Attributes
# | Attribute | Type | Description |
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IfcRoot (4) | |||
IfcObjectDefinition (7) | |||
IfcObject (5) | |||
IfcProduct (5) | |||
IfcElement (13) | |||
Click to show 34 hidden inherited attributes Click to hide 34 inherited attributes | |||
IfcWindow (5) | |||
9 | OverallHeight | OPTIONAL IfcPositiveLengthMeasure |
Overall measure of the height, it reflects the Z Dimension of a bounding box, enclosing the window opening. If omitted, the OverallHeight should be taken from the geometric representation of the IfcOpeningElement in which the window is inserted. |
10 | OverallWidth | OPTIONAL IfcPositiveLengthMeasure |
Overall measure of the width, it reflects the X Dimension of a bounding box, enclosing the window opening. If omitted, the OverallWidth should be taken from the geometric representation of the IfcOpeningElement in which the window is inserted. |
11 | PredefinedType | OPTIONAL IfcWindowTypeEnum |
Predefined generic type for a window that is specified in an enumeration. There may be a property set given specifically for the predefined types. |
12 | PartitioningType | OPTIONAL IfcWindowTypePartitioningEnum |
Type defining the general layout of the window in terms of the partitioning of panels. |
13 | UserDefinedPartitioningType | OPTIONAL IfcLabel |
Designator for the user defined partitioning type, shall only be provided, if the value of PartitioningType is set to USERDEFINED. |
6.1.3.44.4 Formal propositions
Name | Description | ||||||
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CorrectPredefinedType |
Either the PredefinedType attribute is unset (e.g. because an IfcWindowType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED. |
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CorrectTypeAssigned |
Either there is no door type object associated, i.e. the IsTypedBy inverse relationship is not provided, or the associated type object has to be of type IfcWindowType. |
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6.1.3.44.5 Property sets
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Pset_Condition
- AssessmentDate
- AssessmentCondition
- AssessmentDescription
- AssessmentType
- AssessmentMethod
- LastAssessmentReport
- NextAssessmentDate
- AssessmentFrequency
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Pset_ConstructionAdministration
- ProcurementMethod
- SpecificationSectionNumber
- SubmittalIdentifer
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Pset_ConstructionOccurence
- InstallationDate
- ModelNumber
- TagNumber
- AssetIdentifier
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Pset_DoorWindowGlazingType
- GlassLayers
- GlassThickness1
- GlassThickness2
- GlassThickness3
- FillGas
- GlassColour
- IsTempered
- IsLaminated
- IsCoated
- IsWired
- VisibleLightReflectance
- VisibleLightTransmittance
- SolarAbsorption
- SolarReflectance
- SolarTransmittance
- SolarHeatGainTransmittance
- ShadingCoefficient
- ThermalTransmittanceSummer
- ThermalTransmittanceWinter
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Pset_ElementKinematics
- CyclicPath
- CyclicRange
- LinearPath
- LinearRange
- MaximumAngularVelocity
- MaximumConstantSpeed
- MinimumTime
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Pset_EnvironmentalCondition
- ReferenceAirRelativeHumidity
- ReferenceEnvironmentTemperature
- MaximumAtmosphericPressure
- StorageTemperatureRange
- MaximumWindSpeed
- OperationalTemperatureRange
- MaximumRainIntensity
- SaltMistLevel
- SeismicResistance
- SmokeLevel
- MaximumSolarRadiation
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Pset_EnvironmentalImpactIndicators
- Reference
- FunctionalUnitReference
- IndicatorsUnit
- LifeCyclePhase
- ExpectedServiceLife
- TotalPrimaryEnergyConsumptionPerUnit
- WaterConsumptionPerUnit
- HazardousWastePerUnit
- NonHazardousWastePerUnit
- ClimateChangePerUnit
- AtmosphericAcidificationPerUnit
- RenewableEnergyConsumptionPerUnit
- NonRenewableEnergyConsumptionPerUnit
- ResourceDepletionPerUnit
- InertWastePerUnit
- RadioactiveWastePerUnit
- StratosphericOzoneLayerDestructionPerUnit
- PhotochemicalOzoneFormationPerUnit
- EutrophicationPerUnit
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Pset_EnvironmentalImpactValues
- TotalPrimaryEnergyConsumption
- WaterConsumption
- HazardousWaste
- NonHazardousWaste
- ClimateChange
- AtmosphericAcidification
- RenewableEnergyConsumption
- NonRenewableEnergyConsumption
- ResourceDepletion
- InertWaste
- RadioactiveWaste
- StratosphericOzoneLayerDestruction
- PhotochemicalOzoneFormation
- Eutrophication
- LeadInTime
- Duration
- LeadOutTime
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Pset_InstallationOccurrence
- InstallationDate
- AcceptanceDate
- PutIntoOperationDate
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Pset_MaintenanceStrategy
- AssetCriticality
- AssetFrailty
- AssetPriority
- MonitoringType
- AccidentResponse
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Pset_MaintenanceTriggerCondition
- ConditionTargetPerformance
- ConditionMaintenanceLevel
- ConditionReplacementLevel
- ConditionDisposalLevel
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Pset_MaintenanceTriggerDuration
- DurationTargetPerformance
- DurationMaintenanceLevel
- DurationReplacementLevel
- DurationDisposalLevel
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Pset_MaintenanceTriggerPerformance
- TargetPerformance
- PerformanceMaintenanceLevel
- ReplacementLevel
- DisposalLevel
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Pset_ManufacturerOccurrence
- AcquisitionDate
- BarCode
- SerialNumber
- BatchReference
- AssemblyPlace
- ManufacturingDate
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Pset_ManufacturerTypeInformation
- GlobalTradeItemNumber
- ArticleNumber
- ModelReference
- ModelLabel
- Manufacturer
- ProductionYear
- AssemblyPlace
- OperationalDocument
- SafetyDocument
- PerformanceCertificate
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Pset_PermeableCoveringProperties
- OperationType
- PanelPosition
- FrameDepth
- FrameThickness
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Pset_RepairOccurrence
- RepairContent
- RepairDate
- MeanTimeToRepair
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Pset_Risk
- RiskName
- RiskType
- NatureOfRisk
- RiskAssessmentMethodology
- UnmitigatedRiskLikelihood
- UnmitigatedRiskConsequence
- UnmitigatedRiskSignificance
- MitigationPlanned
- MitigatedRiskLikelihood
- MitigatedRiskConsequence
- MitigatedRiskSignificance
- MitigationProposed
- AssociatedProduct
- AssociatedActivity
- AssociatedLocation
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Pset_ServiceLife
- ServiceLifeDuration
- MeanTimeBetweenFailure
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Pset_Tolerance
- ToleranceDescription
- ToleranceBasis
- OverallTolerance
- HorizontalTolerance
- OrthogonalTolerance
- VerticalTolerance
- PlanarFlatness
- HorizontalFlatness
- ElevationalFlatness
- SideFlatness
- OverallOrthogonality
- HorizontalOrthogonality
- OrthogonalOrthogonality
- VerticalOrthogonality
- OverallStraightness
- HorizontalStraightness
- OrthogonalStraightness
- VerticalStraightness
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Pset_Uncertainty
- UncertaintyBasis
- UncertaintyDescription
- HorizontalUncertainty
- LinearUncertainty
- OrthogonalUncertainty
- VerticalUncertainty
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Pset_Warranty
- WarrantyIdentifier
- WarrantyStartDate
- IsExtendedWarranty
- WarrantyPeriod
- WarrantyContent
- PointOfContact
- Exclusions
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Pset_WindowCommon
- Reference
- Status
- AcousticRating
- FireRating
- SecurityRating
- IsExternal
- Infiltration
- ThermalTransmittance
- GlazingAreaFraction
- HasSillExternal
- HasSillInternal
- HasDrive
- SmokeStop
- FireExit
- WaterTightnessRating
- MechanicalLoadRating
- WindLoadRating
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Pset_WindowLiningProperties
- LiningDepth
- LiningThickness
- TransomThickness
- MullionThickness
- FirstTransomOffset
- SecondTransomOffset
- FirstMullionOffset
- SecondMullionOffset
- LiningOffset
- LiningToPanelOffsetX
- LiningToPanelOffsetY
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Pset_WindowPanelProperties
- OperationType
- PanelPosition
- FrameDepth
- FrameThickness
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Qto_BodyGeometryValidation
- GrossSurfaceArea
- NetSurfaceArea
- GrossVolume
- NetVolume
- SurfaceGenusBeforeFeatures
- SurfaceGenusAfterFeatures
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Qto_WindowBaseQuantities
- Width
- Height
- Perimeter
- Area
6.1.3.44.6 Concept usage
Concept | Usage | Description | ||||||||||
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IfcRoot (2) | ||||||||||||
IfcObjectDefinition (9) | ||||||||||||
IfcObject (5) | ||||||||||||
IfcProduct (18) | ||||||||||||
IfcElement (44) | ||||||||||||
IfcBuiltElement (3) | ||||||||||||
Click to show 81 hidden inherited concepts Click to hide 81 inherited concepts | ||||||||||||
IfcWindow (10) | ||||||||||||
Material Set | General |
This concept can be applied to the following resources:
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Material Single | General |
If a single IfcMaterial is referenced, it applies to the lining and framing of the window. |
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Object Typing | General |
This concept can be applied to the following resources: |
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Product Local Placement | General |
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Profile 3D Geometry | General |
The window profile is represented by a three-dimensional closed curve lying in the xz plane. The profile is used to apply the parameters of a parametric door representation. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used:
A 'Profile' representation has to be provided if:
The following additional constraints apply to the 'Profile' representation type:
As shown in Figure 6.1.3.44.D, the profile defines the outer boundary to which the window lining parameters relate as:
![]() Figure 6.1.3.44.E illustrates the insertion of a parametrically generated window into the IfcOpeningElement by creating an instance of IfcWindow with PartitioningType = DoublePanelHorizontal. The parameters OverallHeight and OverallWidth show the extent of the window in the positive Z and X axis of the local placement of the window. The lining and the transom are created by the given parameters. ![]() Figure 6.1.3.44.F illustrates the final window (DoublePanelHorizontal) with first panel having PanelPosition = TOP, OperationType = BOTTOMHUNG and second panel having PanelPosition = BOTTOM and OperationType = TILTANDTURNLEFTHAND. ![]() |
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Property Sets for Objects | General |
This concept can be applied to the following resources: |
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Quantity Sets | General |
This concept can be applied to the following resources: |
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Spatial Containment | General |
The IfcWindow, as any subtype of IfcBuiltElement, may participate alternatively in one of the two different containment relationships:
The IfcWindow may also be connected to the IfcOpeningElement in which it is placed as a filler. In this case, the spatial containment relationship shall be provided, see Figure 6.1.3.44.G. ![]() |
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Window Attributes | General |
The parameters that defines the shape of the IfcWindow, are given at the IfcWindowType and the property sets, which are included in the IfcWindowType. The IfcWindow only defines the local placement which determines the opening direction of the window. The overall layout and its symbolic presentation of the IfcWindow is determined by its IfcWindowType.PartitioningType. The type determines the number and position of window panels. Depending on the type, the appropriate instances of IfcWindowLiningProperties and IfcWindowPanelProperties are attached in the list of HasPropertySets. Each window panel has its own operation type, provided by IfcWindowPanelProperties.OperationType. All window panels are assumed to open into the same direction. If relevant for the particular window panel operation, the hinge side (whether a window opens to the left or to the right) is determined by the IfcWindowPanelProperties.OperationType. See IfcWindowTypePartitioningEnum for the correct usage of panel partitioning and IfcWindowPanelProperties for the opening symbols for different panel operation types. There are different conventions in different countries on how to show the symbolic presentation of the window panel operation (the "triangles"). Either as seen from the exterior, or from the interior side. Table 6.1.3.44.O illustrates window operation symbols from the exterior side (the convention as used predominately in Europe).
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Material Constituent Set | General |
No description available. |
6.1.3.44.7 Formal representation
ENTITY IfcWindow SUBTYPE OF (IfcBuiltElement); OverallHeight : OPTIONAL IfcPositiveLengthMeasure; OverallWidth : OPTIONAL IfcPositiveLengthMeasure; PredefinedType : OPTIONAL IfcWindowTypeEnum; PartitioningType : OPTIONAL IfcWindowTypePartitioningEnum; UserDefinedPartitioningType : OPTIONAL IfcLabel; WHERE CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR (PredefinedType <> IfcWindowTypeEnum.USERDEFINED) OR ((PredefinedType = IfcWindowTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType)); CorrectTypeAssigned : (SIZEOF(IsTypedBy) = 0) OR ('IFC4X3_DEV_54a9de1b.IFCWINDOWTYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType)); END_ENTITY;