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A comment on Improving ventilation will help curb SARS-CoV-2. Parent comment

Re:Improving ventilation will help curb SARS-CoV-2 by jfkgktkrjt on Sunday May 30, 2021 @07:54PM (#27338240)
There are window particle filters (like insect nets):

https://www.respilon.com/products/products/window-membranes/

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