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. 2021 Jun 24:1–6. doi: 10.1017/ice.2021.284

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© The Society for Healthcare Epidemiology of America 2021

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means subject to acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Fig. 4. — Rate of clearance of aerosolized smoke particles in the corridor with differing numbers of air cleaners. Some sources also called these “portable HEPA filters.” Line color goes from light to dark for cases with progressively more air cleaners, with 0, 4, 6, 8, 10, and 12 evenly spaced air cleaners considered in the corridor.