Factors to consider in the performance evaluation of an air purifier using an airborne virus (Phi-X174) in a large chamber

Jung Hoon Lee, Hwan Kim, Hyoung Il Kim, Kook Hyun Yu

Research output: Contribution to journalArticlepeer-review


Devices for the filtration and sterilization of indoor spaces have been widely used owing to the outbreak of the novel coronavirus disease 2019 (COVID-19). There is a need for a standard method to test the effectiveness of such devices. In this study, we aimed to identify important factors that must be considered while evaluating the efficiency of air purifiers in a large chamber. Investigation of the distribution characteristics of airborne viruses in the large chamber show that they were evenly distributed. Natural (gravitational) reduction of airborne viruses in the large chamber was also investigated. We found that the airborne-virus removal efficiency of an air purifier in a large chamber should be evaluated after 40 min for better accuracy because the concentration of airborne viruses rapidly decreased within the first 40 min and the settling velocity reduced after 40 min. In addition, the minimum standard deviation of airborne-virus removal efficiency of air purifier was 1.9% with a natural reduction time of 40 min. Moreover, the sampling efficiencies of three types of samplers were compared. The impactor showed the highest sampling efficiency (4.8 × 104–5.1 × 104 PFU/m3-min) and a small standard deviation (0.9 × 104 PFU/m3-min).

Original languageEnglish
JournalIndoor and Built Environment
Publication statusAccepted/In press - 2023

Bibliographical note

Funding Information:
The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This research was supported by a grant from the Ministry of Land, Infrastructure and Transport of the Korean Government (Project Number: 20CTAP-C157254-01).

Publisher Copyright:
© The Author(s) 2023.

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Public Health, Environmental and Occupational Health


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