Using HEPASilent® technology the 200/300 Series Particle Filter removes particles such as pollen, dust, and pet dander from your indoor environment with 99.97% accuracy, down to 0.1 microns in size. The 200/300 Series Particle Filter is designed specifically as a replacement filter for the Blueair 201, 203, 215B, 250E, 270E, and 303 air purifiers. The gradient structure of …