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highly dependent on user training, motivation, and utilization. Refer to the above instructions for proper fit.
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.
The noise reduction capability of this hearing protector against impulsive noise may be estimated by referring to
the attenuation performance of the hearing protector at the frequency of the impulsive noise exposure as provided
in the attenuation data on the package.
To estimate the noise reduction capability of this hearing protector against impulsive noise, refer to the At-
tenuation Data below or on the product package. If the frequency of the impulsive noise is 2000 hertz (Hz), for
example, the mean (average) reduction of noise attained by test subjects at that frequency was 32.1 decibels (dB).
Using the standard deviation of + 2.8 dB, the estimated noise reduction at 2000 Hz would range from 29.3 dB to
34.9 dB.
Refer to manufacturer of equipment producing the impulsive noise to determine the frequency.
WARNING!
An appropriate hearing conservation program must be utilized that includes adequate monitoring and
audiometric testing to ensure effective hearing protection. Improper use of the hearing protector or failure to
conduct adequate monitoring and testing can result in hearing loss or other serious personal injury.
ATTENUATION DATA
ANSI S3.19-1974
ATTENUATION DATA - headband version
MEDIUM
Frequency (Hz)
Mean (dB)
Standard deviation (dB)
Warning!
For noise environments dominated by frequencies below 500 Hz, the C-weighted environmental noise level
should be used. Improper fit of this device will reduce its effectiveness in attenuating noise. Failure to follow
this warning can result in serious personal injury or permanent hearing loss.
MSA Corporate Headquarters
P.O. Box 426
Pittsburgh, PA 15230
USA
Phone 412.967.3000
U.S. Customer Service 1.800.MSA.2222
MSA Canada 416.520.4225
MSA Mexico (52) 55 2122 5770
MSA International 412.967.3354
www.MSAnet.com
C 3
C 4
+
+
125
250
500
15.8
20.0
27.4
2.8
2.5
3.0
+
+
FM
(AM)
OFF
1000
2000
3150
30.7
32.1
37.9
2.4
2.8
3.1
7
USA
R
L
FM
(AM)
OFF
FM knob hel kåpa märkt L/R
FM knob sidvy hjäss
4000
6300
8000
39.2
41.2
38.8
3.2
2.8
3.7
/ CAN / MX
R
FM knob sidvy med hjälm
NRR
23
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