Cover with frame with lock
| Class | Dimensions of the clear opening mm | External dimensions mm |
| A 15 | 400/400 | 500/500 |
| A 15 | 500/500 | 600/600 |
| A 15 | 600/600 | 700/700 |
| B 125 | 400/400 | 500/500 |
| B 125 | 500/500 | 600/600 |
| B 125 | 600/600 | 700/700 |
| B 125 | 800/800 | 964/964 |
