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. 2020 Sep 1;25(3):150–156. doi: 10.1177/1535676020924171

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© ABSA International 2020

This article is distributed under the terms of the Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 2. — Forced particle penetration of N95 FFRs. Three types of 3M N95 FFRs were used in this study: model 1860, model 1805, and model 1870/1870+. (A) Regions of each FFR tested for particle penetration. (B) An example of a model 1860 mounted and connected to an Aerotek Portable Particle Counter. A total of 283 L of air was forced through each 1-inch-diameter test section of the mask.