www.norsonic.com Case Study Innovative sound instrumentation Nor848A Acoustic camera Filming Low-Frequency Structure Born Noise With Acoustic Camera Jørgen Grythe, Norsonic AS Measurements in apartment building Oslo, Norway, September 2015 Problem An apartment complex consists of five floors, with several apartments over four floors, and an attic on the top floor. In the attic an air circulation system is installed to provide circulation in the bathroms of all the apartments in the building. The circulation system is driven by an air fan distributing air through pipes going to all apartments. The air pipes are cemented in to the structure of the building itself, and in some apartments a low frequency structure born noise with the same frequency content as the frequency of the air

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