Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Components (hierarchy name)
4. components (objects parts)
5. [components by specific context]
6. architectural elements
7. circulation elements
8. [stairs and stair components]
9. stairs (series of steps)
10. [stairs by location or context]

Anotations

Scope note:

Stairs within buildings so designed that they are relatively secure from the effects of fire in a building and thus are designated as an emergency escape. Use "fire escapes" for stairs located on the outside of buildings to provide a means of escape in case of fire.