Noise Reduction Rating (Nrr) - 3M Pro-Protect Manual

NOISE REDUCTION RATING (NRR)

PRO-PROTECT PRO-COMMS ELECTRONIC HEARING PROTECTION
The U.S. Environmental Protection Agency (EPA) has selected the Noise Reduction Rating (NRR) as the measure of
a hearing protector's noise-reducing capabilities. 3M makes no warranties as to the suitability of the NRR as a
measure of actual protection from any noise level since such protection depends on the sound level (loudness),
how long you listen to the loud sound and how well you fit the earmuff over your ears. Although hearing
protectors can be recommended for protection against harmful effects of impulse noise, the NRR is based on
the attenuation of continuous noise and may not be an accurate indicator of the protection attainable against
impulse noise such as gunfire.
When worn according to the User Instructions, this hearing protector helps reduce exposure to both continuous
noises, such as industrial noises and noises from vehicles and aircraft, as well as very loud impulse noises, such
as gunfire. It is difficult to predict the required and/or actual hearing protection obtained during exposure to
impulse noises. For gunfire, the weapon type, number of rounds fired, proper selection, fit and use of hearing
protection, proper care of hearing protection and other variables will impact performance. If your hearing
seems dulled or you hear a ringing or buzzing during or after any noise exposure (including gunfire), or for
any other reason you suspect a hearing problem, your hearing may be at risk. To learn more about hearing
protection for impulse noise, visit 3M.com/hearing.
WARNING
U.S. EPA specifies the NRR as the measure of hearing protector noise reduction. However, 3M makes no
warranties as to the suitability of the NRR for this purpose. Research suggests that users may receive less
noise reduction than indicated by the attenuation label value(s) on the packaging due to variation in fit,
fitting skill, and motivation of the user. Refer to applicable regulations or guidance on how to adjust attenuation
label values. It is recommended that the NRR be reduced by 50% to better estimate typical protection.
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