nanofleeces. In any case, the production of filters is an intricate affair – and the adhesive used has to fulfil a multitude of other tasks in addition to the bond [...] for private use, which are supposed to rid the indoor air of harmful influences. There are a number of differences between the various models, too: while some [...] simple filter media made of paper, other models from high-quality brands contain complex filter elements. These combination filters consist of materials such as activated
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