About NRR Safety First

NRR (Noise Reduction Rating) it’s the technical word of Ear Plug or Earmuff H9A

The NRR is a single number rating which is required by law to be shown on the label of each hearing protector sold in the United States. The NRR is specified by 40 CFR code of Federal Regulations, Part 211, Product Noise Labeling, Subpart B – Hearing Protection Devises. It (the NRR) is independent of the noise spectrum in which it is applied.

About Project

The NRR is a single number rating which is required by law to be shown on the label of each hearing protector sold in the United States.

Website URL

Visit the website at www.nrrsafetyfirst.com

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