Noise generated in Blade Dampers

Sound power noise generated by blade dampers in ventilation systems. The noise level depends on the volume flow through the damper and pressure drop across it.

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:

Note: 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

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Results

Noise Correction-- dB
Volume Flow (m³/h)Noise Correction (dB)
100-10
200-7
500-3
10000
20003
40006
80009
1600017