Sound Attenuation - Duct split to Terminals

mobile - visible on handheld devices - alternatively go to www.engineeringtoolbox.com!

Engineering ToolBox > Sound Attenuation - Duct split to Terminals

Estimation of sound attenuation when ducts are split to terminals

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

sound allowance lw split branch terminals

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:

sound allowance

Example - Attenuation to Terminals

If a duct is split in four similar terminals the attenuation for each terminal is 6 dB.

Related Topics

Engineering Toolbox >

Acoustics Room acoustics, acoustic properties - decibel A, B and C, Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity, attenuation ..
Noise and Sound in HVAC Systems Calculate noise, sound and silencers in HVAC systems

Related Documents

Directivity Coefficient and Sound Attenuation The attenuation in a room depends on the receiver and source location.
Sound Attenuation due to End Reflection Some of the low frequency noise transferred to the end terminals in a ventilation system, reflects back to the duct.
Sound Attenuation in Unlined Sheet-Metal Ducts Attenuation of sound in unlined sheet-metal ducts
Sound Attenuation of Lined Sheet-Metal Ducts Sound attenuation in rectangular straight, lined, sheet metal ducts.
Sound Attenuation in Duct Elbows Attenuation in duct elbows is caused by reflected sound. It is only in big ducts and at high frequencies the attenuation is considerable.
Sound Attenuation - Main Ducts to Branches Sound attenuation for main ducts to branches.
Sound Transmission through Duct Walls Estimating sound transmission from a duct to the surrounding room.

.