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Development of an Advanced Respirator Fit Test Headform

Development of an Advanced Respirator Fit Test Headform. The mask sealing area for the M40 gas mask is much different than that of N95 FFRs, and the material properties of the gas mask are vastly different. For the static HF, FFs obtained at 25 lpm were 2209300 geometric mean of 1500 ; for the articulated HF, FFs of 80009000 were

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