OMG - this has to be the BEST HEPA Air Purifier out there.  I am a smoker and I bought 3 of these, one is in my bedroom, one is in my home office and I purchased this unit for my living room - my house is over 2000 sq feet and I am amazed how well this works.  My allergies are less, and my house does not smell of smoke anymore.  Even my dogs allergies have been reduced.  THANK YOU THANK YOU !!!!