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Noise attenuation in unlined sheet-metal ducts.
Attenuation of sound in unlined sheet metal ducts at different frequencies are indicated below:
Example - Sound Attenuation in an Unlined Duct
The sound attenuation in a rectangular 600 x 600 mm unlined duct is 0.35 dB/m for frequency 250 Hz. The sound attenuation in 10 m duct is
(10 m) (0.35 dB/m) = 3.5 dB
- 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.
- Estimating sound attenuation where ducts splits to terminals.
- 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.
- Sound transmitted through duct walls, floors and ceilings.
- Acoustic noise calculation procedure HVAC systems.
- Noise in a ventilation system can be reduced by reactive, diffuser type, active and/or dissipative silencers.
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