5000 nm is pretty small. How many SARS-CoV-2 Virions will fit in one aerosol particle?
https://www.livescience.com/coronavirus-can-spread-as-an-aerosol.html On Sat, Apr 4, 2020 at 7:43 PM Terry Blanton <hohlr...@gmail.com> wrote: > Not exactly true. > > > https://www.sciencemag.org/news/2020/04/you-may-be-able-spread-coronavirus-just-breathing-new-report-finds > > > On Sat, Apr 4, 2020 at 7:38 PM <mix...@bigpond.com> wrote: > >> In reply to Terry Blanton's message of Sat, 4 Apr 2020 18:35:31 -0400: >> Hi, >> [snip] >> >I found an old Hoover HEPA vacuum bag and thought to make a mask. Then I >> >Googled the idea. Nothing new under the sun. HEPA spec is 300 nm but >> test >> >show them effective down to 50 nm (depends on the rating). SARS-CoV-2 is >> >125 nm. >> >> I think the size of the virus is irrelevant. The mask doesn't really have >> to stop individual virus particles, it only >> has to stop the moisture droplets that carry them. Droplets are thousands >> of times larger than the virus. >> A normal handkerchief/silk scarf should do fine provided that there are >> no spaces around edge where droplets can bypass >> the filter. >> Regards, >> >> >> Robin van Spaandonk >> >> local asymmetry = temporary success >> >>
