Discover and read the best of Twitter Threads about #FitFiltrationFunction
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Optimize filtration material:
☑️Surgical masks are good
Look for ASTM-rated
✅Respirators are best
Look for standardized filters:
Canadian - 95PFE
South Korean- KF94
Chinese - KN95
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☑️Surgical masks are good
Look for ASTM-rated
✅Respirators are best
Look for standardized filters:
Canadian - 95PFE
South Korean- KF94
Chinese - KN95
2/
You won’t find a NIOSH certified “N95” for children.
NIOSH only regulates products for adults.
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NIOSH only regulates products for adults.
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#BetterMasks #FitFiltrationFunction
@masknerd’s google docs excel sheet tabulating all his mask testing results is a goldmine of information!
I highlighted some of his data in the pictured table to further explore the validity of the “well-fitting medical mask” narrative
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@masknerd’s google docs excel sheet tabulating all his mask testing results is a goldmine of information!
I highlighted some of his data in the pictured table to further explore the validity of the “well-fitting medical mask” narrative
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A few ASTM level 3 surgical masks were tested. Worn without modification, they had a filtration efficiency of 35-78% (via particle counter).
(Side note- don’t twist the ear loops- it makes the fit worse)
Is > 20% leak well-fitting? Not in my books.
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(Side note- don’t twist the ear loops- it makes the fit worse)
Is > 20% leak well-fitting? Not in my books.
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With a mask brace to improve seal, the surgical masks performed better: > 92% filtration efficiency, not quite well-sealed N95 quality
To pass a formal quantitative fit test for respirators (ie N95s), one must achieve at least 99% filtration efficiency (fit factor of 100).
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To pass a formal quantitative fit test for respirators (ie N95s), one must achieve at least 99% filtration efficiency (fit factor of 100).
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