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Sound Attenuation - Duct split to Terminals

Estimating sound attenuation where ducts splits to terminals.

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Splitting ducts to terminals will reduce the sound power level - L_N - 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, 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

Lined Sheet-Metal Ducts - Sound Attenuation - Noise attenuation in rectangular straight, lined, sheet metal ducts.
Sound - Attenuation and the Directivity Coefficient - The attenuation in a room depends on the location of the sound source and the receiver - and the room constant.
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 Attenuation in Ducts due to End Reflection - Low frequency noise transferred from main duct to end terminals is reflected back to main duct.
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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