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SARS-CoV-2: Air purifiers eliminate 90% of aerosols in school classrooms

ASPUR air purifiers
SARS-CoV-2: Air purifiers eliminate 90% of aerosols in school classrooms
Experimental study of the medRxiv from October 6th, 2020 (published on aerzteblatt.de)

In an experimental study, the installation of 4 commercially available air purifiers reduced the concentration of aerosols in a classroom by 90% within half an hour. According to the study in medRxiv (2020; DOI: 10.1101/2020.10.02.20205633), the students and teachers came to conclusion that the noise pollution from the air purifiers are not disturbing.

SARS-CoV-2 and other respiratory viruses are transmitted via droplets, aerosols and by touching objects or people. Droplets are held back by a mouth and nose cover. Hand disinfection helps against transmission through touch. Air purifiers can be a protective measure against aerosols that are only partially retained by a mouth and nose cover.

The air purifiers accelerated the decay of the aerosols. Together, the devices converted between 760 and 1,460 m3 of air per hour, which means that the room air was filtered around 5.5 times per hour. According to the measurements, this resulted in a continuous drop in the aerosol concentration. It dropped more than 90% in 37 minutes from when the lesson started. According to the study, the reduction affected all particle sizes equally.

Picture: © Tumisu, coronavirus (id) 4994442 - Pixabay.de


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