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Noise generated in Blade Dampers

Sound power noise generated by blade dampers in ventilation systems.

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

blade dampers noise generation diagram

  • 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
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