The acoustic performance of round and oval ducts is superior to rectangular ducts since their curved surfaces allow less breakout noise. Low-frequency sound is better contained in round ducts.
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.
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 transmitted through duct walls, floors and ceilings.
Noise attenuation in unlined sheet-metal ducts.
Noise in a ventilation system can be reduced by reactive, diffuser type, active and/or dissipative silencers.
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