A Corsi – Rosenthal box is as clever as efficient. Great for classrooms and offices alike. 🙂
https://blink.ucsd.edu/_files/safety-tab/COVID-filter-system-poster.pdf
This box reduces the number of viruses in the air with at least 80%. And reduces the number of infections with about the same number. Combined with N95/FFp2 masks the protection will be almost 100%. 🙂
Keywords: ffp2, n95, air cleaner, aircleaner, air quality, corsi – rosenthal, box, covid protection