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.

  • Rethinking K-12 Schools as a Continuous Learning Experience

    Most students move through three or more separate facilities during their K-12 journey, yet the built environments they encounter at each stage have traditionally been designed in isolation, with little continuity in spatial language, learning philosophy, or physical resources. Each new school is a reset with different layouts, learning models, expectations, and ways of moving through a building. The next generation of school design is making the case that the first day of kindergarten and the last day of high school can and should feel connected through common support systems and infrastructure in the physical environment.

  • Back-to-School Playground Safety: 7 Common Hazards to Look for After Summer Break

    As summer break comes to an end, school administrators have plenty to prepare before students return. While classrooms, hallways and common areas often receive attention during all the back-to-school preparations, the playground should not be overlooked. Months of weather exposure, storms, and regular wear can leave behind hazards that may not be immediately noticeable.

  • UCF Modernizes College of Hospitality Management

    The University of Central Florida in Orlando, Fla., recently completed a major renovation effort for the Rosen College of Hospitality Management, according to a news release. The project modernized 77,600 square feet worth of academic classrooms, teaching labs, and collaborative spaces to support both students and faculty.