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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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