 The Hamilton Air Purifier series are designed for small rooms.
With 3 way filtration, it stands out from other small space air purifiers. It also has automatic setting for the fan. Thus, it will adjust it fan speed according to air quality of your room.
It's maintainance costs is higher than other small space air purifiers ( due to it's UV filtration). It's also quite noisy. So if you're looking for a quiet air purifier, this may not be a good choice.
Hamilton Beach Ultra Digital 04163.
RATING: 
  With prefilter, HEPA filter, UV light.
With automatic sensor to check air quality.
4 fan speed.
Filter replacement light.
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AREA : up to 350 sq ft
Hamilton Beach Ultra Digital 04161.
RATING: 
Features as above but for smaller space.
Read full review
AREA : up to 200 sq ft
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AIR PURIFIER FAQ