We have this thing for my girlfriend purchased the allergies and div. suffers a bit skeptical at the beginning but convinced the end. the air purifier cleans quietly and quietly but constantly to himself, after a few hours were "caught" feinstaub items seen on the needles and metal flake, which is odorless though early on a bit (quite easily) "electric", but never really disturbing. and my friend also goes better, we will certainly be a second purchase for the duration of cleaning. It is really disgusting when sees wiviel dirt because so flying around.