| Can be locked partially open for fresh air | |
| Can be locked fully open for fresh air | |
| Can be left open as a regular practice | |
| Must be kept closed and locked at all times |
| All of these are correct | |
| Tear gas | |
| More than 500 lbs of allowed hazardous materials | |
| Class 2 poison |
| Once per week | |
| At the end of the shift | |
| At the beginning of the next shift | |
| Immediately |