Krachtig en meerlaags filter voor 3-voudige reiniging van lucht: filter voor grof stof, filter H13 en actieve koolfilterDo you understand how tranquil a whisper is? Whispering creates a audio tension of approx. 30 dB(A). That is in fact louder than our Aerostyle devices at the bottom setting. And typically you wouldn’t sit appropriate next to the