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Appendix 1- Attenuation of Hearing Protective Devices
Hearing protective devices have EPA noise reduction ratings (NRR). The ratings are derived from laboratory testing results in dBC. The actual in field attenuation is less than the laboratory testing results. OSHA recommends subtracting 7 dB from NRR and dividing by 2 to get the in-field attenuation in dBA.
Hearing Protective DevicesNRRField Attenuation (dBA)
E-A-R Classic® SuperFit 33 3313
Howard Leight max earplugs3313
E-A-R® TaperFit® 23212.5
Howard Leight disposable earplug3212.5
Moldex Pura-Fit ear plugs3212.5
E-A-R® Classic foam2911
E-A-R® EarFlex282810.5
EAR® Model 4000 Earmuff2710
E-A-R® Muffs - Model 3000269.5
E-A-R® UltraFit® Plugs259
E-A-R® Express Reusable Earpods259
Moldex Jazz Band Hearing Band259


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