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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  

Related Topics

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

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