EARPLUGS
Noise Reduction Ratings When OSHA promulgated its Hearing Conservation Amendment in 1983, it incorporated the EPA labeling requirements for hearing protectors (40 CFR 211), which required manufacturers to identify the noise reduction capability of all hearing protectors on the hearing protector package. This measure is referred to as the Noise Reduction Rating (NRR) . It is a laboratory-derived numerical
NRR 32 Foam Earplugs • Dual color wing shape • Comfortable fit • Low pressure • Extremely soft • Meets ANSI S3.19 and CSA Z94.2 CLASS AL DM-HP10400 Cordless, 200 pr/box . . . 26.00 BX DM-HP10401 Corded, 100 pr/box . . . . 26.00 BX
NRR 32 Foam Earplugs • Wing shape • Comfortable fit • Low pressure • Extremely soft • Meets ANSI S3.19 and CSA Z94.2 CLASS AL DM-HP10300 Cordless, 200 pr/box . . . 24.00 BX DM-HP10301 Corded, 100 pr/box . . . . 24.00 BX
estimate of the attenuation achieved by the protector.
Methods for Estimating Hearing Protector Devices Attenuation for Single Protection (such as ear plugs or muffs) 1. Determine the manufacturer’s NRR 2. Subtract the NRR from the C-weighted TWA workplace noise level, as follows: Estimated Exposure (dBA) = TWA (dBC) - NRR If C-weighted noise level data is not available, A-weighted data can be used by subtracting a 7 dB correction factor from the NRR, as follows: Estimated Exposure (dBA) = TWA (dBA) - (NRR - 7) Example: TWA=100 dBA, muff NRR=19 dB Estimated Exposure = 100 - (19-7) = 88 dBA https://www.osha.gov/otm/section-3-health-hazards/chapter-5#appendixf
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