| NE51 opération flow & inspection | cleaning instruction for NE51 |
 |
 |
| changing UV lamps | demonstration of emergency escape |
 |
 |
| changing filters for a FFU make up air device | changing ceiling filters |
 |
 |
| cleaning ventilation filters | operating a dry and wet vacuum cleaner |
 |
 |
| operating a stir-fry machine | |
 |
