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Noise Reduction Rating Explained | Headphonesty
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How do You Calculate Noise Reduction Rating (NRR)?
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Earmuffs (NRR 22 dB)(433.130)_Safety Equipment_Hardware Tools_S-TURBO D.I.Y. & HARDWARE
Bullhead Safety® Hearing Protection Premium High-Visibility Cap Mounted NRR 22 dB Earmuffs - HP-M3 Bullhead Safety Eyewear, Cooling Safety, Heat Stress Safety, Work at Height Safety, Hearing Safety
