For a summary I purchased this for my bedroom in my apartment that unfortunately usually has a mildew smell plus my cats litter box which has to be kept in my room as well. My room is a medium sized room being 13'ft (W) and 15'ft (L) and this purifier does a wonderful job of cleaning out the odor from the room. Also, my girlfriend who lives with me has really horrendous allergies says that it has helped her reduce allergy attacks while in the room. Take it as you will but this is a great purifier for the price as well!