3M strongly recommends fit testing of hearing protectors. Research suggests that many users will receive less noise reduction than indicated by the NRR due to variation on hearing protector fit, fitting skill and motivation of the user. 3M™ E-A-R™ Flexible Fit Earplugs are fit-testable with the 3M™ E-A-Rfit™ Dual-Ear Validation System. If the NRR is used, 3M recommends that it be reduced by 50% or in accordance with applicable regulations.
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