Confined Space

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Across
  1. 4. : Act of breaking plane into confined space
  2. 5. : Device continuously measuring air quality
  3. 6. : Worker entering permit-required space
  4. 7. : Process circulating fresh air into space
Down
  1. 1. : Emergency extraction of entrant from space
  2. 2. : Confined area requiring written authorization
  3. 3. : Person stationed outside confined space
  4. 8. : Air quality tested before confined space entry