I have some sinus issues and tried all sorts of medications which didn’t really help. As a last resort, I decided to try an air purifier. I did extensive research on the Internet and finally decided to purchase the Alen BreatheSmart Classic Air Purifier. It’s been about only 2 weeks since I started using the Air Purifier, and I already started to feel the difference. It is quiet and easy to operate. I am very satisfied with my purchase and would highly recommend this product to anyone.