I was surprised how well this Honeywell Honeywell 50250 Air Purifier unit worked. It is not a huge piece of equipment so I did not expect it to do as well of a job as it does. It cut the amount of dust in the room dramatically and that is just what can be seen. I am amazed at how much it pulls out of the air (after looking at the outer filter). As I said in bio line though, on its highest setting it is a little bit too loud.