#### 7.1.3.2 IfcAirTerminalBox

| Diffuseur d'air
| Volumenstromregler

An air terminal box typically participates in an HVAC duct distribution system and is used to control or modulate the amount of air delivered to its downstream ductwork. An air terminal box type is often referred to as an "air flow regulator".

> HISTORY New entity in IFC4

## Mechanical System Design

Instance diagram

Object Typing

The Object Typing concept applies to this entity.

Exchange |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Import | - | R | R | - | - | R
Export | - | R | R | - | - | R

Assigned Group

The Assigned Group concept applies to this entity as shown in Table 5.

Type
IfcDistributionSystem
Table 5 — IfcAirTerminalBox Assigned Group

Exchange |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Import | - | R | R | - | - | R
Export | - | R | R | - | - | R

Classification

The Classification concept applies to this entity.

Exchange |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Import | - | R | R |  | - | R
Export | - | R | R |  | - | R

Identity

The Identity concept applies to this entity.

Exchange |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Import |  | R | R |  |  | R
Export |  | R | R |  |  | R

XSD Specification:

<xs:element name="IfcAirTerminalBox" type="ifc:IfcAirTerminalBox" substitutionGroup="ifc:IfcFlowController" nillable="true"/>
<xs:complexType name="IfcAirTerminalBox">
<xs:complexContent>
<xs:extension base="ifc:IfcFlowController"/>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcAirTerminalBox

| SUBTYPE OF (IfcFlowController);

PredefinedType | : | OPTIONAL IfcStrippedOptional;

| WHERE

CorrectPredefinedType | : | NOT(EXISTS(PredefinedType)) OR (PredefinedType <> IfcAirTerminalBoxTypeEnum.USERDEFINED) OR ((PredefinedType = IfcAirTerminalBoxTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
CorrectTypeAssigned | : | (SIZEOF(IsTypedBy) = 0) OR ('IFCHVACDOMAIN.IFCAIRTERMINALBOXTYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType));

END_ENTITY;

Formal Propositions:

CorrectPredefinedType | : | Either the PredefinedType attribute is unset (e.g. because an IfcAirTerminalBoxType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED.
CorrectTypeAssigned | : | Either there is no air terminal box type object associated, i.e. the IsTypedBy inverse relationship is not provided, or the associated type object has to be of type IfcAirTerminalBoxType.

Inheritance Graph:

ENTITY IfcAirTerminalBox

| ENTITY IfcRoot

GlobalId | : | IfcGloballyUniqueId;
OwnerHistory | : | OPTIONAL IfcOwnerHistory;
Name | : | OPTIONAL IfcLabel;
Description | : | OPTIONAL IfcText;

| ENTITY IfcObjectDefinition

| INVERSE

HasAssignments | : | SET OF IfcRelAssigns FOR RelatedObjects;
HasContext | : | SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions;
IsDecomposedBy | : | SET OF IfcRelAggregates FOR RelatingObject;
Decomposes | : | SET [0:1] OF IfcRelAggregates FOR RelatedObjects;
HasAssociations | : | SET OF IfcRelAssociates FOR RelatedObjects;

| ENTITY IfcObject

ObjectType | : | OPTIONAL IfcStrippedOptional;

| INVERSE

IsTypedBy | : | SET [0:1] OF IfcRelDefinesByType FOR RelatedObjects;

| ENTITY IfcProduct

ObjectPlacement | : | OPTIONAL IfcStrippedOptional;
Representation | : | OPTIONAL IfcStrippedOptional;

| INVERSE

| ENTITY IfcElement

Tag | : | OPTIONAL IfcStrippedOptional;

| INVERSE

| ENTITY IfcDistributionElement

| INVERSE

HasPorts | : | SET OF IfcRelConnectsPortToElement FOR RelatedElement;

| ENTITY IfcDistributionFlowElement

| INVERSE

| ENTITY IfcFlowController

| ENTITY IfcAirTerminalBox

PredefinedType | : | OPTIONAL IfcStrippedOptional;

END_ENTITY;

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