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Experimental investigation to verify if excessive plastic sheeting shielding produce micro clusters of SARS-CoV-2

Ishigaki, Y.; Kawauchi, Y.; Yokogawa, S.; Saito, A.; Kitamura, H.; Moritake, T.

2021-05-27 occupational and environmental health
10.1101/2021.05.22.21257321 medRxiv
Show abstract

We experimentally investigated indoor air ventilation using the CO2 tracer technique to verify the infection cluster of SARS-CoV-2 that erupted at an office space. Multi-placed observations revealed extremely low air change rates (0.1/h) at the site. The local infection clusters were observed several meters away from a door that is the only ventilation in the office, which suggests a negative effect of plastic sheeting shielding. The thermo-fluid simulation showed that the plastic sheet blocked the airflow and trapped the exhaled air in each partition cell. As risk suppression methods, improving air ventilation by opening windows and using fans were verified, and significant improvements (10-28/h) were observed for each partition cells.

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