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However, while HEPA filters trap most smoke particles, they cannot remove all of them, especially ultrafine particles smaller than 0.3 microns

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The United States Environmental Protection Agency, or EPA for short, has this to say about the efficacy of HEPA Filters: This type of air filter can theoretically remove at least 99.97% of dust, pollen, mold, bacteria, and any airborne particles with a size of 0.3 microns (m) Particles that are larger or smaller are trapped with even higher efficiency