Blueair Classic 280i Air Purifier. I have been using Blueair products for over 14 years now and I can say that the 200 series is the best such as the latest smart 280i. Blueair Classic 280i. The performance is much better than 400 and 600 series hence it uses only 1 filter and it is the cheapest filter compared to other Blueair filters.
