Blueair 500 Series Replacement Smokestop Filter 3 Filters in Package 13 x 9.5 x 8.5

Compatible with all Blueair 500 & 600 Series Air Purifiers Replacement for: 501, 503, 550E, 601, 603, 650E 3-stage progressive filter

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