Skip to main content
Add as a preferred source on Google

Classroom Purifier Cuts Infection Risks in Half—Same as Opening Windows

  • By Dian Schaffhauser
  • 03/08/21

A study in two South Korean high schools found that window ventilation reduced the risk of COVID-19 infection by 55%, while the use of an air purifier shrank the risk by 50%. The combination of the two dropped the risk by nearly three-quarters (73%). Researchers from the Infrastructure Safety department at the Korea Institute of Civil Engineering and Building Technology (KICT) said the use of the air-purifying device worked best when it was placed in the middle of the room, which was sized to hold about 25 students.

The study ran several rounds in which the performance of various antiviral and antibacterial air purifiers was tested in an actual classroom. Virus-like salt microparticles were released into the air as aerosols, and the researchers measured the concentration levels in succession in the center and at the edge of the room during each round to simulate the presence of an infectious student.

For a final round, the researchers worked with a specific air purifier: the AiroDoctor WAD-M20. The testing, which ran over the course of several days, assumed that students didn't move about the space and maintained distances from each other.

The AiroDoctor is a $4,000, free-standing device about the size of a 13-gallon garbage can. According to coverage of the study, students weren't bothered by noise from the machine.

"We are very pleased about the groundbreaking results from South Korea," said Carsten Hermann, managing director of ScreenSource GmbH, which produces the machine, in a press release. "We trust that the relevant authorities nationally and internationally will take notice of such important studies. After all, the globally unique filter technology of the AiroDoctor can make an important contribution in a long-term strategy against SARS-CoV-2."

About the Author

Dian Schaffhauser is a former senior contributing editor for 1105 Media's education publications THE Journal, Campus Technology and Spaces4Learning.

Featured

  • Esports are Growing in Popularity

    Video games and esports are a popular social hobby, and it’s one that’s accessible to a wide variety of physical ability levels. Some esport student-athletes have started to earn scholarship opportunities, and high schools are beginning to form teams equipped with the same degree of resources as their physical sports teams. However, the two have very different needs.

  • Missouri Child Development Center Completes $2.3M Expansion

    The Urban Sprouts Child Development Center in St. Louis, Mo., recently announced the completion of a $2.3-million expansion and adaptive reuse project, according to a news release. The new space includes a retail café, outdoor learning space, and a support office building.

  • Montclair State University Debuts New VR Facility

    Montclair State University in Montclair, N.J., recently announced the completion of a new virtual reality learning facility developed in partnership with Dreamscape Learn, according to a news release. The 2,450-square-foot lab space is inside the College of Communication and Media building and will serve students pursuing careers in digital media, virtual reality, and content creation.

  • Houston-Area High School Receives Best Project Award from ENR

    Tomball West High School near Houston, Texas, recently received a K–12 Education Best Project Award in Engineering News-Record’s 2026 Texas & Southeast Best Projects Awards, according to a press release. The new facility was completed in May and opened its doors to students for the fall 2026 semester.