This is a fantastic air purifier.
I shopped for a good while before I finally decided to go with the Germ Guardian.  It takes up very little space, as it plugs directly into the wall.  I placed it in the litter box room and within an hour I could tell a difference.  I moved it to the kitchen after cooking garlic & onions and it got rid of the cooking odors in a short time. It makes a little humming noise when in use, but I find it hardly noticeable.  For the money, you can't go wrong with this unit.
Rating: 5 stars