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

  • California K–12 District Finishes Renovations on Multi-Sport Stadium

    The Alameda Unified School District (AUSD) in Alameda, Calif., recently announced the completion of a renovation project on the Encinal Jr. & Sr. High School stadium, according to a news release. The district partnered with Quattrocchi Kwok Architects (QKA) and Bothman Construction on the facility, and funding came from Bond Measure B.

  • Houston-Area High School Breaks Ground on 117,000SF Multi-Use Facility

    North Shore Senior High School, part of Galena Park ISD in Houston, Texas, recently broke ground on a new multi-use facility for student extracurriculars, according to a news release. The North Shore Multi-Use Facility will include dedicated practice and training space for the school’s athletics and fine arts programs.

  • Massachusetts K–12 District Selects Architect for New Junior High

    Swansea Public Schools in Swansea, Mass., recently announced that it has selected Finegold Alexander Architects to design a new junior high school for the district, according to a news release. The firm will create the Feasibility Study and Schematic Design for Joseph Case Junior High School after a lengthy selection process by the Massachusetts School Building Authority (MSBA).

  • Spaces4Learning Launches 2026 Education Design Showcase Awards

    Spaces4Learning has opened submissions for the 2026 Education Design Showcase! The awards program launched in 1999 with the goal of celebrating innovative, practical solutions in the planning, design, and construction of K–12 and higher-education facilities. EDS recognizes new developments that help achieve optimal learning environments, as well as the architecture firms that brought the ideas to life.