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Figure 8 - Workplace Protection Factors for North 7700 Halfmask Respirators with High Efficiency Filters Cumulative Distribution: (Lognormal) -< H -- r " ^ - C D > r o 0 3 3 "tJ Geometric Mean: 250 Geometric Standard Deviation: 6.9 Best Estimate of 5th Percentile: 11 Data: 12, 20, 36, 60, 74, 110, 260, 350, 400, 1000, 1900, 2000, 2400, 3100 DUP 0907349