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Lined Sheet-Metal Ducts - Sound Attenuation

Noise attenuation in rectangular straight, lined, sheet metal ducts.

Attenuation in ducts with 25 mm lining are indicated below:

Sound Attenuation of Lined Sheet-Metal Ducts

Attenuation in ducts with 50 mm lining are indicated below:

Sound Attenuation of Lined Sheet-Metal Ducts

Example - Sound Attenuation in Lined Duct

The sound attenuation in 610 x 610 mm lined duct is approximately 2.5 dB/m at frequency 250 Hz. The sound attenuation in 10 m duct can be calculated as

(10 m) (2.5 dB/m) = 25 dB  

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