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2. 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.

3. N95 Masks vs. KN95 Masks: Which Work Best to Protect ... - AOL

   www.aol.com/n95-masks-vs-kn95-masks-161012369.html

   Even if you have received your vaccine and booster, medical experts continue to promote the wearing of face coverings as an effective way to prevent the spread of Covid-19, the Omicron variant ...

4. Stock up on KN95s after the updated CDC guidelines ... - AOL

   www.aol.com/lifestyle/stock-kn95s-updated-cdc...

   These high-quality masks are only $2.50 apiece right now. ... Keep in mind that wearing a mask doesn’t mean you should stop practicing known methods of preventing the spread of COVID-19. Social ...

5. How Much Do Masks Really Cost? From Cloth to KN95, Here’s a ...

   www.aol.com/much-masks-really-cost-cloth...

   Cloth masks are also reusable, and the CDC recommends that you wash your cloth mask as soon as it becomes dirty either by hand or in the washing machine. One time cost: $4.00 Surgical

6. Elastomeric respirator - Wikipedia

   en.wikipedia.org/wiki/Elastomeric_respirator

   During the COVID-19 pandemic, masks with unfiltered-exhalation valves ran counter to the requirements of some mandatory mask orders. [ 60 ] [ 61 ] Despite the aforementioned belief, a 2020 research by the NIOSH and CDC shows that an uncovered exhalation valve already provides source control on a level similar to, or even better than, surgical ...

7. Respirator assigned protection factors - Wikipedia

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

   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] Therefore, the use of such respirators has been limited to the values 50 or 100 PEL in the United States.

8. Which face masks actually work against COVID-19? - AOL

   www.aol.com/face-masks-actually-against-covid...

   In August, Etsy’s quarterly earnings report showed mask sales on the site reached $346 million in the second quarter of 2020. During the same period, face mask sales netted the struggling ...

9. European respirator standards - Wikipedia

   en.wikipedia.org/wiki/European_respirator_standards

   The protection provided by an FFP2 (or FFP3) mask includes the protection provided by a mask of the lower-numbered classes. A mask conforming to the standard must have its class written on it, along with the name of the standard and its year of publication, as well as any applicable option codes, e.g. “EN 149:2001 FFP1 NR D”.