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  1. Oxford Dictionary

    air shaft

    • n.
      a straight, typically vertical passage admitting air into a mine, tunnel, or building.

    • noun: air shaft, plural noun: air shafts

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    air shaft

    • IPA[ˈer SHaft]
    • n.
      a straight, typically vertical passage admitting air into a mine, tunnel, or building.

    Oxford American Dictionary