Krachtig en meerlaags filter voor 3-voudige reiniging van lucht: filter voor grof stof, filter H13 en actieve koolfilterDo you understand how peaceful a whisper is? Whispering generates a sound strain of approx. 30 dB(A). That is definitely louder than our Aerostyle units at the lowest placing. And typically you wouldn’t sit suitable next to them