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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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Airflow filtration efficiency (percent activity exhaled ± CI) with test mask placed on the source and Masks sealed and unsealed. N95 (3M respirator), SMnat (surgical mask looped naturally around the ears), SF (SecureFit™ Ultra Fitted surgical mask), and PT (SecureFit™ Ultra Fitted surgical mask with nanofiber filter media).