It is designed to enhance traction in ventilation and flue systems and protect from rain
Is made as per the calculations by the Central institute of aerodynamics
| D, mm | 2D, mm | A, mm | B, mm | Weight, kg |
| 350 | 700 | 420 | 420 | 8,72 |
| 400 | 800 | 470 | 480 | 11,32 |
| 450 | 900 | 520 | 540 | 15,85 |
| 500 | 1000 | 570 | 600 | 19,48 |
| 550 | 1100 | 620 | 660 | 23,49 |
| 600 | 1200 | 670 | 720 | 27,87 |
| 650 | 1300 | 720 | 780 | 32,62 |
| 700 | 1400 | 770 | 840 | 37,75 |