Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Tools and Equipment (hierarchy name)
5. equipment
6. [equipment by profession or discipline]
7. [equipment for science and technology]
8. scientific instruments
9. chemistry equipment
10. chemical testing devices

Anotations

Scope note:

Devices which decompose a material or gas in a catalytic reaction such as odors, volatile organic compounds, and automobile exhaust and suppressing their emission, particularly VOC gasses containing volatile organic compounds.