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What is NRR?

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What is NRR?

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NRR stands for Noise Reduction Rating. The EPA has selected the NRR as the descriptor of hearing protector effectiveness to be used on labels required by US EPA regulation 40 CFR Part 211, Subpart B. Although hearing protectors can be recommended for protection against the harmful effects of impulsive noise, the NRR is based on the attenuation of continuous noise and may not be an accurate indicator of the protection provided against impulsive noise.

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