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https://www.cdc.gov/niosh/npptl/respirators/testing/results/MTT-2020-211.1_International_GuangzhouPowecomi_KN95-Earloop-Style_TestReport_Redacted-508.pdf
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Live and learn, they are large enough for double masking should one get to that point. I'm not quite at the face shield stage but I do have them.
Particulate contaminants come in all sizes and filters in air conditioners capture larger particles. Water filters are a whole different thing and largely use different techniques than air filters (activated carbon and ionic resins versus simple filters with small openings, though reverse osmosis is more like an air filter).
But regardless of anything else, people still have a reason to wear masks: government mandates.
"Address lines can not contain more than 25 characters. Your shipping address has been modified. Please review your address if you require any further changes."
There's no issue with my address. Seems like the site is bugged and not allowing any orders.
Grabbed 20 of those for $20.65 shipped using the StaySave7 coupon code....which cut 7% off.
Live and learn, they are large enough for double masking should one get to that point. I'm not quite at the face shield stage but I do have them.