Figure 4
Particle size-dependent retention for (
) FFP2, (
) KN95, and (
) N95 masks. (a) Particle median passage over the relative standard deviation of passage over particle sizes. A, B, and C mark regimes for classification of the mask performance of fully norm compliant (A), partially compliant (B) and non-compliant (C) mask batches. The dashed line marks the 6% specification according to DIN EN 149. For the three regimes (A), (B), and (C), the three small graphs exemplarily show the particle passage over particle size. The dotted line represents the maximum allowed passage of 6%. (b) Particle median passage over highest passage of all particle size classes within one batch. The dashed lines mark the 6% specification according to DIN EN 149.
