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. 2021 Jan 20;76(5):617–622. doi: 10.1111/anae.15392

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© 2021 Association of Anaesthetists

This article is being made freely available through PubMed Central as part of the COVID-19 public health emergency response. It can be used for unrestricted research re-use and analysis in any form or by any means with acknowledgement of the original source, for the duration of the public health emergency.

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Average simulated workplace protection factor for 51 participants wearing N95, snorkel masks with high‐efficiency filters (SM‐HEF), and snorkel masks with powered air‐purifying respirators (SM‐PAPR). *, p < 0.05 when compared with N95.