noise reduction rating


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noise reduction rating

[′nȯiz ri‚dək·shən ‚rād·iŋ]
(acoustics)
A common method for expressing values of noise reduction or attenuation provided by different types of hearing protectors; values range from 0 to approximately 30, with higher values indicating greater amounts of noise reduction. Abbreviated NRR.
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The Food and Drug Administration states that "Any manufacturer wishing to make claims regarding the acoustic effectiveness of a device, other than its noise reduction ratings, must demonstrate the validity of such claims, including the presentation of test data and the specific methods used to validate the claims" (Federal Register/Vol.
Before closing I must mention that the noise reduction ratings given to both ear plugs and ear muffs by their manufacturers are often based on their attenuation of continuous noise (such as in a factory) and may not be a true indication of the protection they offer from impulsive noise such as a firearm.
With an NRR (Noise Reduction Rating) of 31, they're ideal for use while shooting, traveling, swimming or listening to loud music.
The Howard Leight by Honeywell Impact PRO Electronic Earmuffs give you 350 hours of use from a single pair of AAA batteries, and they offer a Noise Reduction Rating (NRR) of 30.
The NRR or noise reduction rating is used in the USA and the SNR, single number rating, is the system used in the EU to indicate the amount of protection offered by a correctly fitted device.
On the packaging for each, you'll see an "NRR." That's the Noise Reduction Rating that each set has proven to diminish sound by.
With a noise reduction rating of 30 dB, these earplugs can be used not only in environments where noise is just a nuisance, but also even in environments with hazardous noise levels.
When obtaining ear protection, look for the noise reduction rating (NRR) printed on the box.
Hearing protectors have a noise reduction rating (NRR) printed on the package.
Standard CSB-900 Series headsets with gel-filled ear pads Dual-speaker headset with a noise reduction rating of 24dB.
With a Noise Reduction Rating of 28 dB, EP7's offer hearing protection blocking out harmful sounds over 85 dB while allowing lower ambient sounds to enter.
*Premium dual-speaker headset with noise reduction rating of 24dB.