CONFINED SPACE

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Across
  1. 4. The basic number of sensors in our detectors
  2. 5. Spark producing work
  3. 6. Provision of fresh air into a space
  4. 7. An invisible gas created as a by product of burning fossil fuels
  5. 9. These must be considered before entering any space
Down
  1. 1. The hole watch
  2. 2. The layering of gases in a confined space
  3. 3. Atmospheric testing requirement for hotwork with flammable
  4. 8. The person entering the space
  5. 9. This gas smells like rotten eggs