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