Krachtig en meerlaags filter voor 3-voudige reiniging van lucht: filter voor grof stof, filter H13 en actieve koolfilterDo you know how quiet a whisper is? Whispering provides a seem stress of approx. thirty dB(A). That is in fact louder than our Aerostyle products at the lowest location. And usually you wouldn’t sit right beside them.Anti-topple