Abstract
Low-frequency noise in buildings is receiving greater focus in new noise standards. The extraordinary performance of active duct silencers on these low frequencies provides a powerful new element for fan noise control. Acoustical consultants need to know the most appropriate applications for active duct silencers. The authors have been personally involved in the design and start-up of over 1000 active duct silencers installed in the USA and Europe to silence fans on a variety of HVAC applications. This site experience from office buildings, schools, hospitals, semiconductor manufacturing facilities, auditoria, sound test chambers, and cruise ships—both retrofit and new construction—is summarized to guide acoustical consultants in estimating the performance of active duct silencers. Fan and duct silencer system layouts are reviewed, along with performance case histories.
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