Krachtig en meerlaags filter voor three-voudige reiniging van lucht: filter voor grof stof, filter H13 en actieve koolfilterDo you know how peaceful a whisper is? Whispering creates a sound pressure of approx. 30 dB(A). That is actually louder than our Aerostyle units at the lowest location. And typically you wouldn’t sit right close to them.Info