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Figure 8: Attenuation results were used to calculate the "Protected Exposure Levels," and were plotted as a function of the unprotected exposure levels. The fit of the protector was evaluated at 125, 500 and 2000 Hz using a field REAT system. Red symbols depict the results for the right ear and blue symbols depict the left ear. The reference lines at 70 and 85 dBA indicate the ideal range between which a worker's protected exposure level should lie. [From NIOSH.[20] Used with permission]

Figure 8: Attenuation results were used to calculate the