The optional SmokeStop filter kit provides your Blueair system with better protection from smoke and other airborne gases. This complete SmokeStop filter change kit fits all Blueair 400 Series HEPASilent Air Purifiers (402, 403, 450E), and comes complete with:
1 enhanced HEPASilent filter of polypropylene (equal particle efficiency), with more activated carbon for better smoke and gas removal.

Replace every 6 months.

Easy maintenance:
When the filter need to be replaced (twice yearly), just open the side, slide out the old filter and drop the new one in. No screws, hooks or tools and less than one minute of your time are required.