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2. 5 top-rated and lab-tested air purifiers - AOL

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   Honeywell HPA300. Honeywell HPA300 HEPA Air Purifier for Extra Large Rooms - Microscopic Airborne Allergen+ Reducer, Cleans Up To 2250 Sq Ft in 1 Hour - Wildfire/Smoke, Pollen, Pet Dander, and ...

3. It's time to breathe easy: Get a top air purifier while it's ...

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   This machine is equipped with a HEPA filter to weed out up to 99.97 percent of allergens, smoke, pollen, odors, dust and mold that are lurking in your air. ... The Honeywell HPA300 Air Purifier is ...

4. HEPA - Wikipedia

   en.wikipedia.org/wiki/HEPA

   HEPA filters are designed to arrest very fine particles effectively, but they do not filter out gasses and odor molecules. Circumstances requiring filtration of volatile organic compounds, chemical vapors, or cigarette, pet or flatulence odors call for the use of an activated carbon (charcoal) or other type of filter instead of or in addition to a HEPA filter. [20]

5. Early Cyber Monday steal: Grab this ace Honeywell air ... - AOL

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6. Air filtration in operating rooms - Wikipedia

   en.wikipedia.org/wiki/Air_filtration_in...

   High-efficiency particulate air (HEPA) filter is at least 99.97% effective in removing particles ≥0.3 μm in diameter (as a reference, Aspergillus spores are 2.5–3.0 μm in diameter). [3] High-level HEPA filtration and increasing air changes per hour (ACH) can reduce particulate matter (PM) and bacterial concentrations in the operating room ...

7. Ultra-low particulate air - Wikipedia

   en.wikipedia.org/wiki/Ultra-low_particulate_air

   Ultra-low particulate air (ULPA) is a type of air filter. A ULPA filter can remove from the air at least 99.999% of dust, pollen, mold, bacteria and any airborne particles with a minimum particle penetration size of 120 nanometres (0.12 μm, ultrafine particles). A ULPA filter can remove—to a large extent but not 100%—oil smoke, tobacco ...