Noise Attenuation

Energy Efficiency and Noise Attenuation

Noise attenuation devices typically increase the pressure drop of the air distribution system, increasing its energy consumption. Numerous strategies exist for eliminating noise; however, it is preferable not to design a noisy system in the first place. Noise is caused by air movement and transmitted by vibrations to the ductwork from fans, dampers, and other components, especially fume hoods. An engineer can make a system quieter by selecting low-noise fans, incorporating round ductwork, and reducing air-flow velocity by oversizing the ductwork. Active noise cancellation technology can reproduce low-frequency fan noise electronically and reintroduce the noise 180° out of phase, canceling it without restricting air flow within the ductwork. [Wise and Dineen, 1995; Micro-Electronics Facility Efficiency Workshop, 1995; Handbook of Facilities Planning, 1990]

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Fans and noise

Fume hoods and exhaust ductwork noise

Active noise attenuation


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