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

  • Epson Receives Seven AV Industry Awards

    Projectors manufacturer Epson recently announced that it received multiple awards across the Higher Ed AV Awards, SCN Stellar Service Awards, and InfoComm 2025, according to a news release. The company was recognized for three projectors from its PowerLite L-Series line, accessories, installation process, and its customer support team.

  • Photo courtesy of Spiezle Architectural Group, Inc.

    West Melbourne School for Science Completes Expansion Project

    The West Melbourne School for Science, which serves students grades PreK–6 in West Melbourne, Fla., recently completed a 12,450-square-foot elementary school expansion, according to a news release.

  • Ancient Resilience: How Indigenous Intelligence Shapes the 4Roots Education Building

    As climate change intensifies, educational spaces must evolve beyond basic sustainability toward true resilience – we must design environments that can adapt, respond, and thrive amid shifting, and intensifying, climate hazards. Drawing on indigenous wisdom and nature-based strategies, integrating resilient design offers a path to create learning environments that are not only functional but deeply in tune with their natural surroundings.

  • Case Study Highlights Texas District’s Campus Security Upgrades

    The Taft Independent School District near Corpus Christi, Texas, recently partnered with Intech Southwest Services to revamp its campus security technology system, according to a news release. Intech has released a case study on its website detailing the process that advanced the district’s technology by more than 20 years in less than three weeks.

Digital Edition