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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