 The Honeywell Air Purifiers are designed mainly for small rooms.
They comes with sound reducing features that the manufacturer claim will make it quiet at high speed ( some buyers have complained that it's still loud though!).
Honeywell Enviracare 50250 Air Purifier.
RATING: 
  With Odor-Lock filter to absorb odor.
3 fan speeds.
AHAM certified.
Read full review 
AREA : up to 300 sq ft
Honeywell QuietCare 17000 Air Purifier.
RATING:
Soft-touch electronic control.
3 fan speeds.
Intelli-Check™ system monitors filter lifespan.
Read full review
AREA : up to 140 sq ft
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AIR PURIFIER FAQ