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. 2020 Sep 23;17(17):2696–2702. doi: 10.7150/ijms.50657

Figure 1.

Figure 1

Proposed FFP3 filtering respirators models used in this study, such as Moldex 2505 (Culver City, CA, USA; Figure 1A), Aura 9332+ (3M, St Paul, MN, USA, figure 1B), and K113 (3M, St Paul, MN, USA; Figure 1C). Abbreviations: FFP, filtering face pieces.