Krachtig en meerlaags filter voor three-voudige reiniging van lucht: filter voor grof stof, filter H13 en actieve koolfilterDo you understand how quiet a whisper is? Whispering produces a sound pressure of approx. 30 dB(A). That is really louder than our Aerostyle gadgets at the bottom placing. And typically you wouldn’t sit correct beside them.O