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_w - transferred to each terminal.

sound allowance lw split branch terminals

The sound power is reduced according to the amount of air. For similar terminals the attenuation in to each terminal can be found with the diagram below:

sound allowance

Example - Attenuation to Terminals

If a duct is split in four similar terminals the attenuation for each terminal is 6 dB.

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Related Topics

Acoustics Room acoustics, acoustic properties - decibel A, B and C, Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity, attenuation ..
Noise and Sound in HVAC Systems Calculate noise, sound and silencers in HVAC systems

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