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Education
Education 1. Subtract 7 dB from the NRR if in the real world. For more noise is measured on the A- information about the NRR (SF), How to Use weighted decibel scale (dBA). (Skip this step if noise is measured contact 3M Technical Service at 800 243-4630. the Noise on the C-weighted dB scale). 2. Divide the result of step 1 (NRR- Estimating Noise Reduction for 7) by 2. This is known as Individual Users Reduction derating . The labeled values of noise reduction are Rating (NRR) An Example of Reducing the NRR based on laboratory 8-hour TWA noise exposure: 93 dBA tests. It is not NRR of hearing protectors: 29 dB possible to The NRR describes the average use these data sound level reduction (attenuation) Subtract 7 dB from the NRR: 29 dB - 7 dB = 22 dB. to reliably provided by a hearing protection Divide by 2: 22 2 = 11 dB predict levels device (HPD) in a laboratory test. Subtract 11 dB from the of protection Since the NRR is based on 8-hour TWA noise exposure: 93 dBA - 11 dB = 82 dB achieved by a laboratory testing, it does not take given Decide if 82 dB (known as the Protected Exposure ).
United States Canada Technical Service 1 800 243-4630 Technical Service 1 800 267-4414 Sales Assistance 1 800 896-4223 Sales Assistance 1 800 265-1840 ext. 6137G12 2000 Resource Guide
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