Acts as a damper along the flue gases
Is produced:- in basic design without opening;
- in design 1 with aperture 50 mm diameter;
- in design 2 with aperture 15 mm diameter.
| Dv, mm | Dn, mm | В, mm | А, mm | Weight, kg |
| 350 | 420 | 630 | 460 | 9,34 |
| 400 | 460 | 690 | 500 | 10,82 |
| 450 | 520 | 780 | 560 | 13,33 |
| 500 | 560 | 840 | 600 | 15,06 |
| 550 | 620 | 930 | 660 | 18 |
| 600 | 660 | 990 | 700 | 20 |