3M WORKTUNES Manual Del Usuario página 17

NOISE REDUCTION RATING (NRR)
The 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 www.3Mcom/hearing.
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Noise
Reduction
Rating
THE RANGE OF NOISE REDUCTION RATINGS
FOR EXISTING HEARING PROTECTORS
IS APPROXIMATELY 0 TO 30
(HIGHER NUMBERS DENOTE GREATER EFFECTIVENESS)
3M COMPANY
ST. PAUL, MN
Federal law prohibits
removal of this label
prior to purchase
The EPA references to Federal relate to US Federal laws.
Attenuation Data (ANSI S3.19 – 1974)
Test Frequency (Hz)
Mean Attenuation (dB) 20.3 21.6 30.4 35.7
Standard Deviation
The NRR may overestimate the hearing protection provided
during typical use due to variation in fit, fitting skill and motivation
of the user. 3M recommends the NRR be reduced by 50% or
DECIBELS
in accordance with applicable regulations, for estimating the
(WHEN USED AS
amount of noise reduction provided.
DIRECTED)
The NRR for the WorkTunes
Improper fit of this device will reduce its effectiveness in
attenuating noise. Consult the enclosed instructions for proper fit.
Worktunes ™
90542
LABEL REQUIRED BY
U.S. E.P.A. REGULATION
40 CFR PART 211
SUBPART B
125 250 500 1000 2000 3150 4000 6300 8000 NRR CSA Class
3.5 2.7 3.2 3.1
Connect + AM/FM is 24 dB(A).
TM
33.1 36.4 38.9 37.3
3.0 3.6 3.9 3.4
36.4
24 AL
3.6
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