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Sound Attenuation - Duct split to Terminals

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

The sound power is reduced according reduced volume of air.

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

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 calculations. Noise Rating (NR) curves. Sound transmission through walls. Calculate 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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Noise attenuation in duct elbows by reflected sound.

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Sound transmission from ducts to surrounding rooms.

Unlined Sheet-Metal Ducts - Sound Attenuation

Noise attenuation in unlined sheet-metal ducts.

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