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Noise attenuation in duct elbows by reflected sound.
Sound power level attenuation in an elbow is caused by sound reflection. It is only in larger ducts and at higher frequencies the attenuation is considerable.
Attenuation in lined and unlined ducts at different sizes and frequencies are indicated in the table below.
Example - Sound Attenuation in a Duct Elbow
The sound attenuation in an unlined 500 mm duct elbow at 500 Hz is
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 speed and attenuation of sound in moist air varies with sound frequency and air humidity.
The attenuation in a room depends on the location of the sound source and the receiver - and the room constant.
Estimating sound attenuation where ducts splits to terminals.
Sound attenuation from main ducts to branch ducts.
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.
Noise attenuation in unlined sheet-metal ducts.
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