The Myth of Air Purifier in Mitigating the Transmission Risk of SARS-CoV-2 Virus

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a highly infectious disease that emerged in December of 2019, threatening human health and leading to global public crises. Airborne transmission via droplets aerosol has been recently recognized as one the infection modes for SARS-CoV-2 virus. Hospitals have deployed/incorporated indoor air purifiers with hope minimize risk Nevertheless, effectiveness purifier reducing remained unknown. This study uses computational fluid dynamics model dispersion particles exhaled from patient under influence an conditioner, exhaust fans purifier. The numerical showed airflow diffusers, placement significantly influenced pattern common ward. Multiple placed at 1 meter above floor next can increase total efficiency 37.14 59.91% weak exhalation 36.44% 48.81% medium exhalation. No flew out door when multiple were deployed Location matching clean delivery rate size room are important factors affect performance