Sound Attenuation - Duct split to Terminals

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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