#air_passage__airpassage__air_duct__airduct__airway  a duct that provides ventilation as in mines
  supertype:  duct.conduit  an enclosed conduit for a fluid
  part:  venthole
  subtype:  register.air_passage  an air passage (usually in the floor or a wall of a room) for admitting or excluding heated air from the room
  subtype:  snorkel_breather__snorkelbreather__snorkel__schnorchel__breather  air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time
  subtype:  upcast  air passage consisting of a ventilation shaft through which air leaves a mine
  subtype:  ventilation_shaft__ventilationshaft  a shaft in a building; serves as an air passage for ventilation

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