| Can be left open as a regular practice | |
| Must be kept closed and locked at all times | |
| Can be locked fully open for fresh air | |
| Can be locked partially open for fresh air |
| Tear gas | |
| Class 2 poison | |
| More than 500 lbs of allowed hazardous materials | |
| All of these are correct |
| Can be locked fully open for fresh air | |
| Can be locked partially open for fresh air | |
| Can be left open as a regular practice | |
| Must be kept closed and locked at all times |