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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
Room acoustics and acoustic properties, decibel A, B and C, Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity and sound attenuation.
Noise is usually defined as unwanted sound - noise, noise generation, silencers and attenuation in HVAC systems.
Noise attenuation in rectangular straight, lined, sheet metal ducts.
The attenuation in a room depends on the location of the sound source and the receiver - and the room constant.
Sound attenuation from main ducts to branch ducts.
Noise attenuation in duct elbows by reflected sound.
Low frequency noise transferred from main duct to end terminals is reflected back to main duct.
Sound transmission from ducts to surrounding rooms.
Noise attenuation in unlined sheet-metal ducts.
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