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  2. top of the aat hierarchies
  3. Objects Facet
  4. Object Groupings and Systems (hierarchy name)
  5. systems (equipment)
  6. [systems by function]
  7. HVAC
  8. heating systems
  9. warm air heating
  10. ondols
Scope note
Korean heating systems employing warm air chambers or ducts beneath the floor; similar to Roman hypocausts.
Accepted term: 13-May-2024