The fan seems nicely built and blows air perfectly. However, I cannot tell the difference in the air quality at all! Everyone still has their allergies as usual. What I don't get is that it cycles from green to red so frequently. I would think that once it is green that it takes it a while to go back to red. I can't justify buying more of these until I experience the benefits. I'm interested in trying out the air purifier for the kitchen.