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Do you recommend a muff with an NRR of 1 9 dB for a workplace that has a running grinding machine that produces 8 9

Do you recommend a muff with an NRR of 19 dB for a workplace that has a running grinding machine that produces 89 dB, an oven with 87 dB, an agitator with 78 dB, and a drill with 81 dB? All working at the same time.

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