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Noise Attenuation - Changing Duct Area
Changing duct size and noise attenuation
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Sound attenuation when changing the duct area or dimension can be calculated as
dL = 10 log( ( 1 + A1 / A2 )2 / 4 (A1 / A2) ) (1)
where
dL = noise attenuation (dB)
A1 = inlet area (m2)
A2 = outlet area (m2)
Note - only for sharp changes.
Example - Attenuation when changing size of ducts
Noise attenuation when the ratio A1 / A2 = 5 can be calculated as
dL = 10 log( ( 1 + 5 )2 / 4 5 )
= 2.5 dB
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Related Topics
- Noise and Attenuation - Noise is usually defined as unwanted sound - noise, noise generation, silencers and attenuation in HVAC systems
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