#air_passage__airpassage__air_duct__airduct__airway  a duct that provides ventilation as in mines
  supertype:  #duct.conduit  an enclosed conduit for a fluid
  subtype:  #register.air_passage  #snorkel_breather  #upcast  #ventilation_shaft
  part:  #venthole__vent__blowhole  a hole for the escape of gas or air

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