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

  • UT System Board of Regents Approves $108M Housing Complex

    The University of Texas System Board of Regents recently announced the approval of a new, $108-million housing complex at the University of Texas at El Paso (UTEP), according to a news release. The facility will stand four stories and have a total of 456 new beds for freshmen students.

  • DLR Group Appoints New K–12 Education Practice Leader

    Integrated design firm DLR Group recently announced that it has named its new global K–12 Education leader, Senior Principal Carmen Wyckoff, AIA, LEED AP, according to a news release. Her teams have members in all 36 of the firm’s offices in the U.S., Puerto Rico, the U.S. Virgin Islands, Europe, and Asia.

  • University of Rhode Island, Gilbane Partner for Three New Residence Halls

    The University of Rhode Island in Kingston, R.I., recently announced a public-private partnership with construction development firm Gilbane, according to a news release. Gilbane will soon start construction on three new residence halls with a total of 1,100 beds: two with apartment-style suites in northwest campus, and a reconstruction of the Graduate Village Apartments for graduate students.

  • classroom with crystal ball on top of a desk

    Call for Opinions: Spaces4Learning 2026 Predictions for Educational Facilities

    As 2025 winds to a close, the Spaces4Learning staff is asking its readers—school administrators, architects, engineers, facilities managers, builders, superintendents, designers, vendors, and more—to send us their predictions for educational facilities in 2026.

Digital Edition