Not so quiet, but does the job well!
We have a puppy and I unfortunately am sensitive to smells. So after getting him, I shortly went online to research anything that will help with the smell. The glad and air wick plugins made the  house smell nice but it ddidn't purify the air. This little gadget does. At first like other reviewers said, you don't really notice a difference until you leave it unplugged for a day. I gave it four stars only because the fan sounds so loud and can't leave it in the bedroom, but GermGuardian has become my new favorite brand amd will be buying their other versions for my other rooms.
Rating: 4 stars