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Protection is judged on the combination of face seal and filter efficiency and, in some cases, full face protection (for example if a mask is integrated into a face shield). If you have a design and would like it to be included in this list, please leave a comment below and provide a link to your build page.

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Nov 09, 2018 · What is a hair's breadth? A strand of the finest human hair is about 20 micrometers (also called microns) in diameter. Take a piece and slice it in half. Then take one of those halves and slice it in half again...and then one more time. Now you've got a sliver of hair that's 2.5 microns wide. Officially, 2.5 microns is 0.0000025 m, or 2.5 µm.

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OSHA also has certain substances that it has always required a HEPA mask for, such as asbestos and lead. NOTE: The numbers refer to the efficiency of the filter. The 95% filters are used for most applications and the nearly 100% efficient P100 filters are used in place of the old HEPA filters for the more toxic particulate situations.

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Mar 13, 2020 · This left me with the need to make a filter. I decided to use a two-stage filter design, for extra security. The first layer, which will be in the smaller bottle, making it replaceable, is a HEPA filter. The HEPA (high-efficiency particulate absorbing) standard is one that has been developed for air filtration equipment.

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All thanks to exceptionally efficient 5 layers of activated carbon filters and high-efficiency filter cloth, harmful particles as small as 1.0 micron will remain restricted in the filters. Thus giving you utmost safety from mold spores, pollen, pet dander, flu germs, bacterial allergens, and other harmful airborne particles.

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It’s just but natural to choose a mask with high filtration capacity and efficiency as well. It wouldn’t be too hard to meticulously check on the effectiveness of the mask. It would really be less time consuming if you go to NIOSH- approved masks and that has PM 2.5 filtration.

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Effectiveness of surgical masks against influenza bioaerosols Article in The Journal of hospital infection 84(1) · March 2013 with 361 Reads How we measure 'reads'

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Jul 30, 2013 · The Respro City mask has less ventilation and is equipped with a “Techno” filter, which has more filtering properties. The Techno mask combines characteristics of both the City and Sportsta masks, taking the Sportsta’s breathability and combining it with the extra filtering capacity (activated charcoal layer) of the City.

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