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. 2014 Apr 15;58(6):771–781. doi: 10.1093/annhyg/meu023

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© The Author 2014. Published by Oxford University Press on behalf of the British Occupational Hygiene Society.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Pressure tracing of a surgical mask looped naturally around the ears (SMnat) and a prototype mask, constructed as a SecureFit™ Ultra Fitted mask with nanofiber filter media (PT) sealed and unsealed. Note difference in sealing SMnat versus PT indicating significant air leak present with loose fit mask versus PT mask.