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A comment on Why don’t we just open the windows? Covid-19 prevention lost in translation. Parent comment

Re:Why don’t we just open the windows? Covid-19 prevention l... by Der_Einzige on Sunday November 28, 2021 @05:29PM (#29373775)
Well, given that virus particles start to be meaningfully filtered only at a certain MERV level (14?), that upgrade may in fact have been more than a "minor symbolic" gesture.
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Re:Why don’t we just open the windows? Covid-19 prevention l... by mlyle on Sunday November 28, 2021 @05:49PM (#29373998)
MERV-13 is pretty good. Better than 90% filtration at 1 micrometer and up. It then comes down to how many air changes you can expect.
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Re:Why don’t we just open the windows? Covid-19 prevention l... by marcosdumay on Sunday November 28, 2021 @07:12PM (#29374734)
> Better than 90% filtration at 1 micrometer and up.

What means it's probably useless against any airbone virus. But it's pretty great against particle pollution, in case you want to use it in a private space.

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Re:Why don’t we just open the windows? Covid-19 prevention l... by PaulDavisThe1st on Sunday November 28, 2021 @07:24PM (#29374823)
Virus size is not the correct metric for a virus transmitted in aerosolized or droplet form (notably, COVID19). What matters is the aerosol/droplet size, which in this case is substantially above 1 micrometer.
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Re:Why don’t we just open the windows? Covid-19 prevention l... by mlyle on Sunday November 28, 2021 @07:46PM (#29374998)
Viruses don't circulate bare in the air. Droplets containing viruses do. It's thought that it's mostly carried within droplets that are 5um or larger.

Just in case smaller particles have a substantial role, I quoted the 1um number.

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