| | OBDi1515 Opposed blade damper 150x150 | | | |
| | OBDi2525 Opposed blade damper 250x250 | | | |
| | OBDi3030 Opposed blade damper 300x300 | | | |
| | OBDi3010 Opposed blade damper 300x100 | | | |
| | OBDi3535 Opposed blade damper 350x350 | | | |
| | OBDi3515 Opposed Blane Damper 350x150 | | | |
| | OBDi4040 Opposed blade damper 400x400 | | | |
| | OBDi4020 Opposed blade damper 400x200 | | | |
| | OBDi4545 Opposed blade damper 450x450 | | | |