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Make the most of your BISSELL air320 air purifier by replacing the filter every 6 months. Regularly maintaining your air purifier by replacing the filter with a genuine BISSELL HEPA replacement filter means your air purifier can continue capturing pollen, dust, pet dander, odors, and VOCs in the air. Our HEPA Filter captures 99.97% of micron particles and smaller, so you can breathe easy.