Blueair recommends changing these replacement air filters every 6 months. The replacement includes 1 particle filter that removes dust, pollen, bacteria, pet dander, mold spores and other airborne particles. The particle filter is made of polypropylene, which mechanically filters out airborne particles. Filters fit Blueair 400 series units Replacement filter fits models 402, 403, 410, 450, 450E. T
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