Fette Filter 2-Pack True HEPA Filter Compatible with Blueair 200/300 Series Particle Filter models 201, 203, 203 Slim, 205, 210B, 215B, 250E, 270E, 270E Slim, 303 HEPA Air Purifier Filters Compatible with 200/300 Series Particle Filters Contains 2 Particle Filters Captures 99.97% of harmful particles such as dust, pollen, and smoke down to 0.1 microns in size. Gradient filter structure resists clogging for maximum airflow, never re-releasing harmful particles Fits Classic Models 201, 203, 203 Slim, 205, 210B, 215B, 250E, 270E, 270E Slim, 303 Two High-Quality Filters Manufactured by Fette Filter