To prevent airborne transmission of SARS-CoV-2 indoor spaces, it is important to use appropriate ventilation systems in buildings. Growing evidences about other technologies that remove infectious particles from the air showed that effectiveness of air purifiers fitted with high-efficiency filters. In the present study, we built a simple air purifier combining a box fan and a MERV13 filter, and investigated the performance of the device. The airflow rate achieved 0.41-0.71 m3/s depending on fan speed. The device generated more than 50dB noise even at the lowest airflow. The amount of PM0.3 was reduced by 40-50% depending on fan speed, thus the estimated clean air delivery rate ranged from 343 to 751 cfm. The cost of the device was U.S.$128. The performance of this simple and inexpensive air purifier is comparable to that of other do-it-yourself air purifiers such as the Corsi-Rosenthal Box.

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