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Sound Attenuation - Duct split to Terminals

Estimation of sound attenuation when ducts are split to terminals

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Splitting ducts to terminals will reduce the sound power level - L_N - transferred to each terminal.

Sound allowance - lw split branch terminals

The sound power is reduced according reduced volume of air.

For equal terminals the attenuation to each terminal is indicated in the diagram below.

Duct to Terminals - Sound allowance

Example - Sound Attenuation from a Duct to Equal Terminals

According the diagram above - for a duct that splits into four equal terminals the sound attenuation from duct to each terminal is approximate

6 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

Related Documents

Directivity Coefficient and Sound Attenuation - Room attenuation depends on location of source and receiver - and the room constant
Sound Attenuation - Main Duct to Branch Ducts - Sound attenuation from main duct to branch ducts
Sound Attenuation in Duct Elbows - Noise attenuation in duct elbows are caused by reflected sound
Sound Attenuation in Ducts due to End Reflection - Some low frequency noise transferred from main duct to end terminals is reflected back to main duct
Sound Attenuation in Unlined Sheet-Metal Ducts - Attenuation of sound in unlined sheet-metal ducts
Sound Attenuation of Lined Sheet-Metal Ducts - Sound attenuation in rectangular straight, lined, sheet metal ducts
Sound Transmission through Duct Walls - Estimating sound transmission from ducts to surrounding rooms

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