11 MILLER GOODALL LTD COMPANY REGISTRATION NO. 5201673 EXPERIENCE YOU CAN RELY ON Noise Assessment for an Extraction System at a Biotechnology Manufacturing Facility Background Miller Goodall Ltd (MGL) was appointed by a biotechnology firm in St Helens to investigate a noise complaint relating to an extraction system and exhaust stack located close to a nearby housing estate. Although noise control measures in the form of an acoustic enclosure had already been installed around a noisy extract fan, it was evident that gaps between panels were allowing noise to escape from the enclosure. Furthermore, noise from the exhaust stack propagated fre

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