Deck 2014: Safety

1. A The tank should be tested only once to ensure the oxygen content is at least 14% before entry.
2. B The tank must be tested at frequent intervals to ensure that hazardous gasses have not regenerated.
3. C The tank need not be tested for oxygen content if it is ventilated for more than 24 hours.
4. D If the oxygen content tests at less than 12% you should wear an approved gas mask.

Tip: press A-D to answer