this is the best
I have the starry Night MinusA2 in my bed room, it has made a huge differnce in the air quality and my alergies, I have the pet air filter.  It is quiet and has a sensor that will make the fan go faster when it detects that the air quality has dropped and it will not auto on to high when the room is dark.  It is easy to get set up and has easy to under stand instructions.
Rating: 5 stars