[treis]

Do you have a cite for the air filters? I'm under the impression that stand alone air filters don't move enough air to be effective.

[mschuster91]

In kindergartens it's 1/3rd less sick days [1], schools is 20% less [2]. That's the most recent I'm aware of.

[1] https://yle.fi/a/74-20062381

[2] https://www.newscientist.com/article/2398713-schools-cut-cov...