Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Visual and Verbal Communication (hierarchy name)
4. Visual Works (hierarchy name)
5. visual works (works)
6. [visual works by form]
7. [visual works by form of image]
8. [images by method of representation]
9. [images by method of projection]
10. orthographic projections (images)
11. plans (orthographic projections)
12. building plans
13. utility plans

Narrower term/s

• heating plans

Anotations

Scope note:

Scaled floor plans showing HVAC layout, which is the layout for heating, ventilation, and air contitioning. They may include small drawings of an adjacent elevation. For other drawings of HVAC systems, use "HVAC drawings."