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. 2020 Nov 25;476(2243):20200469. doi: 10.1098/rspa.2020.0469

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© 2020 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 5. — (a) Standard surgical masks (typical dimensions 9 cm × 16 cm) were (b) reinforced with an electrocharged filtration layer (5 cm × 10 cm) fabricated in-house and attached to the mask’s inner surface to improve filtration efficiency upon (c) wearing the mask. Montana mask holders with tight facial fit with (d) placement design for Object 500 3D printer and the (e) front and (f ) back view of finished the Montana mask, to hold square (5 cm × 5 cm) patches of electrocharged filtration fabric (three layers per mask) to achieve N95 filtration quality. (Online version in colour.)