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For each of the terms, we have highlighted each term in a 3D model of a ventilation unit.
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System A System is not a physical object, but an entity that connects two or more physical Components together. In the example, the ventilation Components (duct, air diffusers, etc.) are highlighted, but the air handling unit is not because it is a System Component and not part of the System. Systems can only be owned by one System Components, but can be added to several System Components. It is not required but recommended that the Systems is connected to a system components. |
Item and Occurrences
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Everything in the Systems Module is built around Items. An Item that has been placed in a project is known as an Occurrence. An Item can have several Occurrences, and multiple Occurrences can be placed in multiple Systems.
In BIM terms, an Item can be equated to a 'Type' and an Occurrence can be equated to an 'Instance'.
In the example model, each Occurrence of the Air Diffusers are highlighted as a single Item.
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