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Indoor air purifiers in the effort to reduce the spread of Coronavirus Disease 2019 (COVID-19): The advantage of circumferential outflow diffusers
AWMA 114th Annual Conference and Exhibition ; 2021-June, 2021.
Artigo em Inglês | Scopus | ID: covidwho-1564591
ABSTRACT
Aerosol particles containing virions or the ribonucleic acid (RNA) of the Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) can be airborne. It has been recently hypothesized that the outflow from air purifiers with a directional outlet could entrain SARSCoV-2-containing particles. Because only the case of a directional outflow was examined, here we investigate an indoor air purifier with a circumferential outflow diffuser instead of a directional outflow, the other typical design. We measured the airflow velocity at two different angles to the surface of the circumferential outflow diffuser and two motor-fan speeds. We visualized in scattered light the deflection of a vertical mist spray cone from a sneeze-simulating nebulizer parallel to the side of the air purifier. We found a significant difference in airflow velocities for different angles to the circumferential outflow diffuser 0.01 m/s – 0.02 m/s for 0° vs. 0.01 m/s – 0.65 m/s for 45° at 1 m distance. We observed no significant deflection of the sneeze-simulating spray cone at the minimum blower speed and a 5 cm deflection at the maximum speed under the experimental conditions. The deflection of the sneeze-simulating spray mist particles by the tested indoor air purifier with the circumferential outflow, under the experimental conditions, is low relative to the recommended safer distances between people in indoor spaces aimed at reducing the spread of COVID-19. Equipping indoor air purifiers with circumferential outflow diffusers has a considerably lower potential to spread infectious aerosols in indoor spaces compared to devices with unidirectional outflow. © 2021 Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA. All rights reserved.
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Coleções: Bases de dados de organismos internacionais Base de dados: Scopus Idioma: Inglês Revista: AWMA 114th Annual Conference and Exhibition Ano de publicação: 2021 Tipo de documento: Artigo

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Coleções: Bases de dados de organismos internacionais Base de dados: Scopus Idioma: Inglês Revista: AWMA 114th Annual Conference and Exhibition Ano de publicação: 2021 Tipo de documento: Artigo