Sound Attenuation - Duct split to Terminals

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

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:

Example - Attenuation to Terminals

For a duct split into four similar terminals the attenuation for each terminal can be estimated to 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 and more ..
• Noise and Attenuation - Noise is usually defined as unwanted sound - noise, noise generation, silencers and attenuation in HVAC systems

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