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

  • 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.

  • S4L Launches 2025 Facilities and Construction Brief Survey

    Spaces4Learning recently launched its 2025 Facilities and Construction Brief Survey, which gathers information on K–12 and higher education construction projects nationwide from the previous year. The data we get from you, our readers, forms an industry report offering an overview of current trends in school facilities.

  • Florida Elementary School to Undergo $47M Reconstruction

    The School District of Osceola County in Kissimmee, Fla., recently announced a partnership with construction firm Skanska to reconstruct Reedy Creek Elementary School, according to a news release. The $47-million project will involve the new construction of a 96,000-square-foot academic center, renovating the remaining facilities, a full-site redevelopment, and demolishing portions of the existing school.

  • Texas District Breaks Ground on New Elementary School

    The Splendora Independent School District (SISD) in Splendora, Texas, recently broke ground on a replacement facility for Greenleaf Elementary School, according to a news release. The district partnered with planning, engineering and program management firm Lockwood, Andrews & Newnam, Inc. (LAN) for the project.

Digital Edition