The door is a built element that is predominately used to provide controlled access for people, goods, animals and vehicles. It includes constructions with hinged, pivoted, sliding, and additionally revolving and folding operations. A door can:

• be a "free standing" door, contained in an IfcSpatialElement such as an IfcBuildingStorey
• fill an opening, typically in a wall. The door will then have a FillsVoids attribute which uses the IfcRelFillsElement relationship to relate the IfcDoor with the IfcOpeningElement
• be part of an element assembly, typically an IfcCurtainWall. The door will then have a Decomposes attribute which uses the the IfcRelAggregates relationship to relate the door with the assembly of elements

There are two main representations for door occurrences:

• IfcDoor entities that have a 3D rectangle 'Profile' shape representation defined. This profile can then be used to parametrically generate the geometry of a door. If not provided, the profile of the IfcOpeningElement can be used if the door fills an opening. The parameters are specified on the relating IfcDoorType that references IfcDoorLiningProperties and IfcDoorPanelProperties for each panel in the door
• IfcDoor entities that are not parametrically generated and have only 'Brep', or 'SurfaceModel' geometry

The parameters of a door are defined by both the IfcDoor occurrence and its IfcDoorType. The IfcDoor specifies:

• the door width and height
• the door opening direction (by the positive y-axis of the ObjectPlacement)

The IfcDoorType specifies parameters which are common to all of its occurrences of IfcDoor:

• the operation type (single swing, double swing, revolving, etc.)
• the door hinge side (by using two different styles for right and left opening doors)
• the particular attributes for the lining by the IfcDoorLiningProperties
• the particular attributes for the panels by the IfcDoorPanelProperties

The opening direction is determined by the local placement of IfcDoor and the OperationType of the IfcDoorType. The IfcDoorTypeOperationEnum defines the general layout of the door type and its symbolic presentation. Depending on the enumerator, the appropriate instances of IfcDoorLiningProperties and IfcDoorPanelProperties are attached in the list of HasPropertySets. The IfcDoorTypeOperationEnum mainly determines the hinge side (left hung, or right hung), the operation (swinging, sliding, folding, etc.) and the number of panels. 

There are different definitions in various countries on what a left opening or left hung or left swing door is (same for right). Therefore the IFC definition may derivate from the local standard and need to be mapped appropriately. 

This concept can be applied to the following resources:

• Lining - Indicates that the material constituent applies to the door lining
• Framing - Indicates that the material constituent applies to the door panel(s); if not provided, the 'Lining' material information applies to panel(s) as well
• Glazing - Indicates that the material constituent applies to the glazing part

This concept can be applied to the following resources:

• IfcDoorType

The product placement is used to determine the opening direction of the door. Restrictions for this concept:

• The PlacementRelTo relationship of IfcLocalPlacement points to the local placement of the same element (if specified), in which the IfcDoor is used as a filling (normally an IfcOpeningElement), as provided by the IfcRelFillsElement relationship
• If the IfcDoor is part of an assembly, e.g. an IfcCurtainWall, then the PlacementRelTo relationship of IfcLocalPlacement points (if specified) to the local placement of that assembly
• If the IfcDoor is not inserted into an IfcOpeningElement, then the PlacementRelTo relationship of IfcLocalPlacement points (if specified) to the local placement of the same IfcSpatialStructureElement that is used in the ContainedInStructure inverse attribute or to a referenced spatial structure element at a higher level

The door 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 is used:

• RepresentationIdentifier: 'Profile'
• RepresentationType: 'Curve3D' or 'GeometricCurveSet'. In case of 'GeometricCurveSet' only a single closed curve is contained in the set of IfcShapeRepresentation.Items

The image below illustrates applying the door lining parameters to the door profile shape representation. The profile defines the outer boundary to which the door lining parameters relate as:

• IfcDoorLiningProperties.LiningDepth starting at distance defined by LiningOffset going into the positive y direction
• IfcDoorLiningProperties.LiningThickness offset into the inner side of the rectangle
• IfcDoorLiningProperties.LiningOffset distance along the positive y direction to where the LiningDepth applies
• IfcDoorLiningProperties.ThresholdThickness starting at the bottom edge of the rectangle into the inner side of the rectangle
• IfcDoorLiningProperties.ThresholdDepth starting at distance defined by LiningOffset going into the positive y direction
• IfcDoorLiningProperties.TransomOffset starting at the bottom edge of the rectangle (along local x axis) into the inner side of the rectangle, distance provided as percentage of overall height. Distance to the center line of the transom

• Pset_ProcessCapacity
• Pset_DoorCommon
• Pset_DoorWindowGlazingType
• Pset_TicketProcessing (only applies to BOOM_BARRIER)
• Pset_TicketProcessing (only applies to TURNSTILE)
• Pset_DoorTypeTurnstile (only applies to TURNSTILE)

This concept can be applied to the following resources:

• Qto_DoorBaseQuantities

The IfcDoor, as any subtype of IfcBuildingElement, can participate alternatively in one of the two different containment relationships:

• the Spatial Containment (defined here)
• the Element Composition

The IfcDoor can also be connected to the IfcOpeningElement in which it is placed as a filler. In this case, the spatial containment relationship is provided, see the image below. 

It is recommended to use an IfcDoor with a 'Profile' representation instead of IfcDoorStandardCase, since IfcDoorStandardCase entity has been removed