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# Sound Attenuation - Duct split to Terminals

## Estimating sound attenuation where ducts splits to terminals.

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

## 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.

## 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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## Citation

• The Engineering ToolBox (2003). Sound Attenuation - Duct split to Terminals. [online] Available at: https://www.engineeringtoolbox.com/sound-attenuation-ducts-d_78.html [Accessed Day Month Year].

Modify the access date according your visit.

7.25.9

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