Krachtig en meerlaags filter voor three-voudige reiniging van lucht: filter voor grof stof, filter H13 en actieve koolfilterDo you know the way silent a whisper is? Whispering produces a sound stress of approx. 30 dB(A). That is really louder than our Aerostyle products at the bottom location. And frequently you wouldn’t sit right next to them.Le