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 makes a seem pressure of approx. 30 dB(A). That is actually louder than our Aerostyle gadgets at the lowest placing. And typically you wouldn’t sit suitable beside them.Ant