3M
™
WorkTunes
™
Hearing Protector User Guide 18
Hearing Conservation
Noise Reduction Rating (NRR)
The EPA (Environmental Protection Agency)
has selected the NRR (Noise Reduction
Rating) as the measure of a hearing
protector’s noise-reducing capabilities.
3M makes no warranties as the suitability
of 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 impulsive noise, the
Noise Reduction Rating (NRR) is based
on the attenuation of continuous noise
and may not be an accurate indicator of
the protection attainable against impulse
noises such as gunfire.
Research suggests that many users will
receive less noise reduction than indicated
by the NRR due to variation in earmuff fit and
wearing time. 3M recommends reducing the
NRR by 50% for estimating the average
amount of noise reduction provided. The
NRR for WorkTunes Hearing Protector is
24 decibels. Improper fit of this device will
reduce its effectiveness in attenuating noise.
Consult the enclosed instructions for proper
fit. The level of noise entering a person’s ear
when a hearing protector is worn as directed
is closely approximated by the difference
between the A-weighted environmental noise
level and the NRR.
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