Sci Show: CDC NIOSH findings show that FFRs with an exhalation valve reduce particle emissions to levels similar to or better than those provided by surgical masks

Friday, December 18, 2020

CDC NIOSH findings show that FFRs with an exhalation valve reduce particle emissions to levels similar to or better than those provided by surgical masks

https://ift.tt/3rcEo5q via /r/science https://ift.tt/38hqRAX

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