3M MT17H682 Serie Instrucciones De Uso página 3

interference with the earmuff cushion. Remove all other unnecessary articles
(e.g. hair, hats, jewelry, headphones, hygiene covers, etc.) that could interfere
with the seal of the earmuff cushion and reduce the protection of the earmuff.
e. Do not bend or reshape the headband, and ensure there is adequate force
to hold the earmuffs firmly in place.
f. Earmuffs, and in particular cushions, may deteriorate with use and should be
examined at frequent intervals for cracking and leakage, for example. When used
regularly, replace the ear cushions and foam liners at least twice a year to maintain
consistent protection, hygiene, and comfort.
g. The output of the electrical audio circuit of this hearing protector may exceed the
daily limit sound level. Adjust the audio volume to the lowest acceptable level.
n CAUTION: Risk of explosion if battery is replaced by an incorrect type.
NOTE:
• 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. To learn more about hearing protection for impulse noise, visit
www.3M.com/hearing.
• Although hearing protectors can be recommended for protection against the 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 impulsive noise such as gunfire (wording required by EPA).
NOTE:
• Operating temperature range: -25.6°F (-32°C) to 131°F (55°C)
• Storage temperature range: -67°F (-55°C) to 158°F (70°C)
In Canada, users of hard hats combined with earmuffs must refer to CSA Standard Z94.1
on industrial protective headwear.
Attenuation Data
The Noise Reduction Rating (NRR) was obtained with the device powered Off. 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 reducing the NRR by 50% or in accordance
with applicable regulations. Consult the fitting instructions illustrated in this instruction
manual for proper fit. The level of noise entering a person's ear, when the hearing protector
is worn as directed, is closely approximated by the difference between the A-weighted
environmental noise level and the NRR.
Example:
1. The environmental noise level as measured at the ear is 92 dB(A).
2. The NRR is 20 decibels (dB).
3. The level of noise entering the ear is approximately equal to 72 dB(A).
NOTE: 3M strongly recommends fit testing of hearing protectors.
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