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  2. The best air purifiers of 2025 - AOL

    www.aol.com/lifestyle/best-air-purifiers...

    One of tallest (nearly 24 inches) and heaviest (17.5 pounds) air purifiers tested, the Winix 5500-2 Air Purifier is ideal for small-to-medium rooms (up to 360 square feet), with a True HEPA filter ...

  3. This HEPA Air Purifier Has Over 7,700 Five-Star Reviews - AOL

    www.aol.com/hepa-air-purifier-over-7-143027386.html

    The post This HEPA Air Purifier Has Over 7,700 Five-Star Reviews appeared first on Reader's Digest. Say hello to this fan-favorite HEPA air purifier and you’ll be saying goodbye to germs ...

  4. Do Air Purifiers Actually Work? Here's What Experts Say - AOL

    www.aol.com/air-purifiers-actually-heres-experts...

    Every model included in the Good Housekeeping Institute's rigorously tested guide to the best air purifiers you can buy has a true HEPA filter. The air purifier's fan draws air into the filter and ...

  5. HEPA - Wikipedia

    en.wikipedia.org/wiki/HEPA

    Generally, washable true HEPA filters are expensive. A high-quality HEPA filter can trap 99.97% of dust particles that are 0.3 microns in diameter. For comparison, a human hair is about 50 to 150 microns in diameter. So, a true HEPA filter is effectively trapping particles several hundred times smaller than the width of a human hair. [33]

  6. Air purifier - Wikipedia

    en.wikipedia.org/wiki/Air_purifier

    An air purifier or air cleaner is a device which removes contaminants from the air in a room to improve indoor air quality. These devices are commonly marketed as being beneficial to allergy sufferers and asthmatics , and at reducing or eliminating second-hand tobacco smoke .

  7. Air ioniser - Wikipedia

    en.wikipedia.org/wiki/Air_ioniser

    Air ioniser and purifier with its dust collection plates removed. Air ionisers are used in air purifiers to remove particles from air. [3] Airborne particles become charged as they attract charged ions from the ioniser by electrostatic attraction. The particles in turn are then attracted to any nearby earthed (grounded) conductors, either ...