Noise Level Reduction

After a new paper mill was commissioned in Austria, complaints were received regarding the noise in the plant local to the fans being in excess of 85dBA. Measurements and assessment of the environment indicated that the fan casing and inlet noise were not the dominant noise sources. The most significant noise source was identified as the unlagged fan discharge ducting on the floor below together with the inlet ducting above the fans. In many cases the surface area of the inlet and discharge ducts connected to fans far exceed that of the fans and contribute significantly to the sound power radiating into the surrounding environment.

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