Nrr db what is

NRR Rating. Custom Protect Ear is the largest personalized hearing protector manufacturer in North America. Types Disposable earplugs typically receive NRR rating in the low to mid 20s. In order to receive the maximum NRR rating from a device, it must be worn properly. Certain employees are required to wear hearing protectors.

If you are exposed to 85 or more decibels of sound for over an eight hour period, which is the case on certain jobs, then you must wear hearing protectors. This amount of sound is considered excessive noise. And it's four times as intense as 85 dB.

This is why you're allowed to work eight hours without hearing protection at 85 dB but only four hours at 88 dB, and two hours at 91 dB. Underestimating the noise intensity by only 3 dB means doubling the noise to which the user is exposed. An even larger error could devastate the eardrums, causing permanent hearing damage.

That's why it's important to understand the NRR - how it works, how to caluclate it, and why you should derate it. The NRR isn't a straightforward measure and is not perfect by any means.

When evaluating noise protection options, it's best to err on the safe side. Don't rely on the number on the packaging. Derate it and add extra protection if you need to. Karoly has worked at a senior level both as an employee and a contractor for organizations in the construction and manufacturing industries.

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If you are interested in shopping our entire selection of hearing protection you can browse here. When hearing protection is worn, your level of exposure to noise is based on the NRR rating of the protection device being used. For example, if you are at a rock concert where the level of noise exposure is dB and you are wearing earplugs with an NRR 33dB, your level of exposure would not be reduced to 67 dB. Instead, to determine the actual amount of decibel deduction applied when decibels are measured dBA which is the most common , you take the NRR number in dB , subtract seven, and then divide by two.

This means that if you are at a rock concert with a level of noise exposure at dB and you are wearing a hearing protector with an NRR 33 dB, your new level of noise exposure is 87 dB.