Blueair Smokestop Filters utilize Activated Carbon to handle odor and gas removal.  In addition, they have the same media as the Particle Filters for removal of allergens and other harmful partculates.

The 400 Series Smokestop Filter is for use in Blueair models 402, 403, and 450E.  Be sure to change your filter every 6 months to allow for maximum performance and ensure the life of you Blueair Air Purifier!