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  2. Respirator assigned protection factors - Wikipedia

    en.wikipedia.org/wiki/Respirator_Assigned...

    Source [26] Negative pressure full face mask. APF decreased from 900 to 40 after PF studies in the workplace. Negative pressure full face masks; Measurement of protection factors of negative pressure full face masks with high-efficiency filters in the laboratory revealed a risk of decrease in protective properties to a small values. [27]

  3. NIOSH air filtration rating - Wikipedia

    en.wikipedia.org/wiki/NIOSH_air_filtration_rating

    During the COVID-19 pandemic, the mask and respirator market rapidly grew, along with counterfeit respirators. [1] NIOSH, on behalf of the Department of Health and Human Services, filed a trademark application on June 17, 2020, for various 42 CFR 84 trademarks, including the N95, allowing NIOSH to enforce rules on counterfeit masks outside of rules defined in 42 CFR 84.

  4. Butter grading - Wikipedia

    en.wikipedia.org/wiki/Butter_grading

    Grade AA butter, made from sweet cream, is the highest grade of butter, has a sweet flavor, and is readily spreadable. [1] If the butter is salted, the salt must be evenly distributed and not interfere with the smooth texture of the butter. [3] To get this grade, the butter must achieve a score of at least 93 out of a possible 100. [5]

  5. The dangers of LED face masks you should know about - AOL

    www.aol.com/lifestyle/dangers-led-face-masks...

    The dangers of LED face masks you should know about. Hannah Kramer. Updated October 21, 2019 at 10:56 AM.

  6. Mechanical filter (respirator) - Wikipedia

    en.wikipedia.org/wiki/Mechanical_filter_(respirator)

    Filtering facepieces are typically simple, light, single-piece, half-face masks and employ the first three mechanical filter mechanisms in the list above to remove particulates from the air stream. The most common of these is the white, disposable standard N95 variety; another type is the Surgical N95 mask.

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