http://oboguev.livejournal.com/ ([identity profile] oboguev.livejournal.com) wrote in [personal profile] pioneer_ru 2020-05-07 09:41 pm (UTC)

"N95 respirators can function within their design specifications for 8 hours of continuous or intermittent use"

https://www.cdc.gov/niosh/topics/hcwcontrols/recommendedguidanceextuse.html
(143 comments)

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