Hierarchy classification:

1. top of the aat hierarchies
2. Activities Facet
3. Processes and Techniques (hierarchy name)
4. [processes and techniques by specific type]

Anotations

Scope note:

The motion of air or the act of causing a current of air through a space. An example is the admission of a proper supply of fresh air to a room, building, mine, or other place where the air readily becomes stagnant or unhealthy.