So far I am very impressed by this air purifier. I have it set to auto mode and when I started frying something in the kitchen the other day I can smell the difference within minutes from 20' away.
It also changes colors when my AC turns on which tells me I have dust in the ductwork or the AC is just stirring up dust in the house.
My condo is approximately 1,100 sq/ft and it doesn't take long for this unit to clean the air . My daughter has allergies and she instantly noticed the difference of smells in the house. I am a happy customer so far!