Blueair 400 Series Replacement Smokestop Filter 99.97% of 0.1 micron particles on Speed One

Compatible with Blueair 400 series air purifiers Replacement filter ensures 6 months of use.

SmokeStop replacement filters Compatible with 400 series Blueair air purifiers 3-stage progressive filter

Contains highly activated carbon for use in rooms with heavy gaseous pollutants, including cigarette smoke.