Air lock

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  1. A casing at the top of an upcast shaft to minimize surface air leakage to the fan. It consists of a large double casing enveloping the whole of the upcast-shaft top and extending into the headgear. Some are fitted with power-operated doors and allow high-speed winding with little leakage. A modern light-alloy structure raised through spring-loaded attachments by the top of the cage on ascending has proved efficient. Syn: shaft casing
  2. A system of doors arranged to allow the passage of workers or vehicles without permitting appreciable airflow. BS, 8
    Source: Dictionary of Mining, Mineral, and Related Terms

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