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| Specifications/Parameters | Flange outer diameter D1 (mm) | Inner diameter D (mm) | Overall length L (mm) | Maximum outer diameter Inch | Flow rate (CMH) |
| 110 single valve | 165 | 102 | 482 | 268 | 80 -350 |
| 160 single valve | 215 | 150 | 455 | 325 | 100-700 |
| 200 single valve | 257 | 190 | 578 | 438 | 150-1600 |
| 2 50 single valve | 330 | 248 | 662 | 482 | 250-1800 |
| 250 (new style) single valve | 330 | 248 | 532 | 389 | 250-1500 |
| 315 single valve | 365 | 302/297 | 641 | 439 | 300-2000 |
| 355 single valve | 435 | 352 | 765 | 484 | 300-2500 |
Each damper will be calibrated before leaving the factory. Ensure the air volume is accurate
The internal valve core changes according to the change of the air inlet pressure on the left side of the pipe, and the right outlet air is constant;
The internal execution valve stem changes according to the change of the required air volume, and the right outlet air speed changes with the left side;
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