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

  • Wold Completes Geothermal Projects at Two Minnesota Schools

    Wold Architects & Engineers recently announced that it has completed two geothermal expansion projects for Mounds View Public Schools in Shoreview, Minn., according to a news release. The work at Highview Middle School and Irondale High School serves the district’s long-term goal of reducing energy costs and dependency on non-renewable fuel sources, as well as improving building performance.

  • Designing the Bridge Between Inclusivity and Independence in K–12 Schools

    Fostering independence is fundamental to learning and development for K–12 students. It offers many proven benefits, such as enhanced confidence, problem-solving, decision-making, and social skills. However, this foundational objective loses its impact if it’s not accessible and adaptable to all students. Inclusivity plays a critical role in cultivating independence and healthy autonomy for students, fostering positive student learning outcomes by uniting pedagogy with the physical learning environment.

  • Big Horn Academy

    Big Horn Academy

    Established in 1999, the Education Design Showcase is a vehicle for showing off innovative — yet practical — solutions in planning, design, architecture, and construction. Big Horn Academy has been recognized with an EDS 2026 Project of Distinction award in the category of New Construction.

  • RIT Saunders College of Business – Lowenthal Hall Addition

    RIT Saunders College of Business – Lowenthal Hall Addition

    Established in 1999, the Education Design Showcase is a vehicle for showing off innovative — yet practical — solutions in planning, design, architecture, and construction. RIT Saunders College of Business's Lowenthal Hall Addition has been recognized with an EDS 2026 Project of Distinction award in the category of New Construction.