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

  • Allegion US Partners with Two Colleges for Mobile Credential Technology

    Allegion US recently announced a partnership with Florida Institute of Technology (FIT) and Denison College, in conjunction with Transact + CBORD, to install mobile credential technologies campus-wide, according to a news release. Implementing Mobile Student ID into Apple Wallet and Google Wallet will allow students access to campus facilities, amenities, and residence halls using just their phones.

  • Lewis C. Cassidy Elementary School

    Established in 1999, the Education Design Showcase is a vehicle for showing off innovative — yet practical — solutions in planning, design, architecture, and construction. Lewis C. Cassidy Elementary School has been recognized with an EDS 2025 Grand Prize award in the category of New Construction.

  • Texas K–12 District to Build New Elementary, High Schools

    The High Island Independent School District on the Bolivar Peninsula in Southeast Texas recently announced that construction on a new elementary school and a new high school will begin in January 2026, according to local news. Funding will come from a $27.9-million bond passed in May 2025.

  • Designing School Spaces for A++ Performance

    In recent years, the educational world has gained greater appreciation for the ways a space’s aesthetics, just like its acoustics, can positively impact educational outcomes. Consequently, engineering, designing, and constructing a school environment demands acoustics to be equally an art and a science, requiring architects and designers to see with their ears, while acousticians must hear with their eyes.

Digital Edition