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3M Hearing Protection: How to Use the Noise Reduction ...

United StatesCanadaTechnical Service 1 800 243-4630 Technical Service 1 800 267-4414 Sales Assistance 1 800 896-4223 Sales Assistance 1 800 265-1840 ext. 6137G122000 Resource GuideHearing ProtectionGEducationHow to Usethe NoiseReductionRating (NRR)The NRR describes the averagesound level Reduction (attenuation)provided by a Hearing protectiondevice (HPD) in a laboratory the NRR is based onlaboratory testing, it does not takeinto account the loss of protectionthat occurs when Hearing protectorsare not fit properly or when they arenot worn for the entire time that thewearer is exposed to noiseFor most wearers, the NRRidentified on the current EPA label(shown here) significantlyoverestimates the protection of thehearing protector in the rating is based on an experimenter fit method ofmeasuring HPD the EPA Noise ReductionRating (Experimenter Fit)The NRR on the EPA labelshown to the right is based on theaverage amount of attenuationprovided by an HPD when it isworn by 10 different people duri

the Noise Reduction Rating (NRR) The NRR describes the average sound level reduction (attenuation) provided by a hearing protection device (HPD) in a laboratory test. Since the NRR is based on laboratory testing, it does not take into account the loss of protection that occurs when hearing protectors

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  Reduction, Noise, Ratings, Noise reduction, Noise reduction rating

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