(mm)
1) The duct dimension is the diameter of round ducts - or square root of area of rectangular duct.
From the diagram above - the sound attenuation for noise with frequency 250 Hz and duct diameter 250 mm is approximately
4 dB
For the same duct with frequency 500 Hz - the sound attenuation due to end reflection is approximately
1 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.
Estimating sound attenuation where ducts splits to terminals.
Noise attenuation in duct elbows by reflected sound.
Sound transmission from ducts to surrounding rooms.
Sound transmitted through duct walls, floors and ceilings.
Noise attenuation in unlined sheet-metal ducts.
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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