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Home » Adjust hearing protectors’ attenuation for real world conditions
Many different types of hearing protection devices (HPDs) are available in the U.S. marketplace, and all share two attributes:
The Noise Reduction Rating ( NRR) is an estimate of the amount of potential protection a hearing protection device will provide in a noisy environment. It is simply the decibel (dB) noise attenuation for the earplug or earmuff based on laboratory test data.