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    • High Noise CommunicationHigh Noise Communication
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    • In-Suit CommunicationIn-Suit Communication
    • General Plant CommunicationGeneral Plant Communication
    • Plant Tour/Training CommunicationPlant Tour/Training Communication
    • Intrinsically Safe EnvironmentsIntrinsically Safe Environments
    • Hearing ProtectionHearing Protection
    • Social Distancing CommunicationSocial Distancing Communication
  • Products+
    • Talk Through Your Ears®Talk Through Your Ears®
    • Custom Hearing ProtectionCustom Hearing Protection
    • Radio Listening EarsetsRadio Listening Earsets
    • HeadsetsHeadsets
    • Lapel Speaker MicsLapel Speaker Mics
    • Cell Phone AccessoriesCell Phone Accessories
    • Tour & Training SystemsTour & Training Systems
    • Earmuffs & EarplugsEarmuffs & Earplugs
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FAQ

What is the Noise Reduction Rating?

The Noise Reduction Rating (NRR) is a laboratory-derived single-number rating designed to characterize a hearing protector's noise reduction capabilities. The level of noise entering a person's ear, when the hearing protector is well-fitted and worn as directed, is approximated by the difference between the environmental noise level and the NRR (A-weighted environmental noise measurements must be corrected by subtracting 7 dB). A more precise estimate of field performance can be provided by Individual Fit Testing. This personalized test is performed under typical wear conditions and results in a Personal Attenuation Rating (PAR) for each worker.

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Related FAQs
  • I've seen headsets and hearing protectors advertised as "OSHA approved" - what does this mean?
  • My job can be boring. Is it OK if I listen to music headphones while I'm working?
  • What is the Personal Attenuation Rating (PAR)?
  • Why do OSHA formulas require us to subtract 7 dB from the Noise Reduction Rating (NRR)?
  • Does OSHA require companies to divide the Noise Reduction Rating (NRR or NRR-7) in half?
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