It is used to prevent basalt fibre from rain
| Dv, mm | Dn, mm | Н, mm | Weight, kg |
| 350 | 420 | 240 | 3,46 |
| 400 | 460 | 220 | 4,04 |
| 450 | 520 | 240 | 5,08 |
| 500 | 560 | 220 | 5,77 |
| 550 | 620 | 240 | 7,01 |
| 600 | 660 | 220 | 7,81 |
| 650 | 720 | 240 | 11,58 |
| 700 | 760 | 220 | 13 |
| 750 | 820 | 240 | 14,85 |
| 800 | 860 | 220 | 16,45 |
| 900 | 960 | 220 | 20,29 |
| 1000 | 1060 | 300 | 24,54 |