I am a fluid mechanic and acoustician by trade. Unfortunately, the product is to be classified as a misdevelopment. It's way too loud. A measurement of the sound pressure level at a distance of 1m resulted in a value of 63 dB at the lowest level. The information in the catalog was about 44 dB. Even if the sound power level is given in the catalogue, which was determined under free field conditions (acoustic room), the differences are not tolerable. Only when the activated charcoal filter is removed does the noise noticeably decrease. But this also significantly reduces the functional determination of the device, which no longer corresponds to the specifications of the device. The cause lies in an incorrect design of the fan used. Due to the increased pressure loss, the characteristic curve of the fan moves very far into the partial load range. The fan is clearly too loud and the volume flow is drastically reduced. The fan can no longer generate the required increase in pressure. Flow separation occurs in the front areas of the fan blades, which is also associated with increased noise. The fan can only produce the pressure jump again when the carbon filter is removed and the pressure loss is reduced. It is a pity that such a product goes on sale at this price. It is not a seal of quality from AEG.
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