![]() So, earplugs in the previous example with NRR 31 dB noise reduction would be (31-7)/2 = 12. To get the actual number of decibel deduction you take the NRR rating (dB), subtract seven, and then divide by two. For example, if you are in a construction site where the noise exposure is 95 dB, and you are wearing foam earplugs with an NRR 31 dB, the level of noise exposure would not reduce to 64 dB. ![]() The NRR ratings labeled on different earplugs and earmuffs do not co-relate to how much noise they will block. To receive the maximum protection from a device, whether an earmuff or earplug, it must be worn properly. Measured in decibels (dB) NRR ratings apply to only earplugs and earmuffs and are useful to users when comparing different hearing protection devices.Ī higher NRR value is better and blocks out more noise than a lower NRR. NRR is short for Noise Reduction Rating, is measuring by the American National Standards (ANSI), and is used to determine how effective a hearing protection device will be against noise. ![]() What is NRR? How does it affect earplugs and earmuffs? Is a higher NRR rating better? I have answered these questions in this post and much more. If you have bought earplugs or earmuffs, you have probably come across the letters ‘NRR’. Hearing protection devices (HPDs) like earplugs and earmuffs are the best defense to help reduce loud noise levels.
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