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The noise generated in a single opposed blade damper can be estimated from the chart below:

The noise level generated depends on the volume flow through the damper and can be corrected using the table below
| Volume Flow (m3/h) |
Noise Correction (dB) |
| 100 | -10 |
| 200 | -7 |
| 500 | -3 |
| 1000 | 0 |
| 2000 | 3 |
| 4000 | 6 |
| 8000 | 9 |
| 16000 | 17 |
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