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Lined Sheet-Metal Ducts - Sound Attenuation

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Attenuation in ducts with 25 mm lining are indicated below:

Attenuation in ducts with 50 mm lining are indicated below:

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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Related Topics

Acoustics

Room acoustics and acoustic properties, decibel A, B and C, Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity and sound attenuation.

Noise and Attenuation

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

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The speed and attenuation of sound in moist air varies with sound frequency and air humidity.

Sound Attenuation - Duct split to Terminals

Estimating sound attenuation where ducts splits to terminals.

Sound Attenuation - Main Duct to Branch Ducts

Sound attenuation from main ducts to branch ducts.

Sound Attenuation in Duct Elbows

Noise attenuation in duct elbows by reflected sound.

Sound Transmission through Duct Walls

Sound transmission from ducts to surrounding rooms.

Unlined Sheet-Metal Ducts - Sound Attenuation

Noise attenuation in unlined sheet-metal ducts.

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