Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Object Groupings and Systems (hierarchy name)
4. systems (equipment)
5. [systems by location or context]
6. building systems

Anotations

Scope note:

Generally includes the HVAC and plumbing of buildings or complexes; in some contexts may also include electrical systems and electricity-based systems, such as protection systems and communication systems.