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# Noise generated in Blade Dampers

The noise - sound power level - generated in single opposed blade dampers can be estimated from the chart below:

• 1 mm water H2O = 9.81 Pa = 9.81 N/m2 = 1 kg/m2 = 0.0736 mm mercury = 0.9677 10-4 atm = 0.00142 psi = 0.0394  in H2O

The noise level generated depends on the volume flow through the damper and can be corrected using the table below

Noise generated in Blade Dampers Correction
Volume Flow
(m3/h)

Noise Correction
(dB)
100 -10
200 -7
500 -3
1000 0
2000 3
4000 6
8000 9
16000 17

## Related Topics

### • Acoustics

Room acoustics and acoustic properties. decibel A, B and C calculations. Noise Rating (NR) curves. Sound transmission through walls. Calculate sound pressure, sound intensity and sound attenuation.

### • Noise and Attenuation

Noise is usually defined as unwanted sound - noise, noise generation, silencers and attenuation in HVAC systems.

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