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(1) F E = C 0 C 1 C 0 × 100 % Where FE represents the filtration efficiency of the dust mask. C 1 represents the dust concentration entering the mask only through the filtration element (mg/m 3). C 0 represents the ambient dust concentration (mg/m 3). The definition of the inward leakage of the dust mask is shown in Eq. .

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