Note that larger inlet or outlet chambers should be calculated separate.
Noise is usually defined as unwanted sound - noise, noise generation, silencers and attenuation in HVAC systems.
Estimate noise generated by air flow in ducts.
Sound power noise generated by blade dampers in ventilation systems.
The logarithmic decibel scale is convenient when adding signal values like sound power, pressure and others from two or more sources.
Acoustic noise calculation procedure HVAC systems.
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