Honeywell SYNC WIRELESS EARMUFF User Instructions page 11

APPROVAL
Sync Wireless tested and approved in accordance with ANSI S3.19-1974 Standard at Michael & Associates Inc.,
USA. Sync Wireless Attenuation Data according to American National Standards Institute Specifications ANSI
S3.19-1974 (in passive mode, electronics switched off).
TESTED ACCORDING TO ANSI S3.19-1974
Frequency, Hz
Mean Attenuation, dB
Standard Deviation, dB
The level of noise entering a person's ear, when
hearing protection is worn as directed, is closely
approximated by the difference between the
A-weighted environmental level and the NRR.
EXAMPLE:
1. The environmental noise level at
the ear is 92 dB (A).
2. The NRR is 25 decibels (dB).
3. The level of noise entering the ear is
approximately equal to 67 dB (A).
CAUTION: 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. Although hearing protectors can
be recommended for protection against the harmful
effects of impulse noise, the Noise Reduction Rating
TESTED ACCORDING TO AS/NZS 1270:2002
Frequency, Hz
Mean Attenuation, dB
Standard Deviation, dB
Assumed Protection, dB
ATTENUATION DATA
125 250 500 1000 2000 3150 4000 6300 8000
20.4 23.0 29.3 36.5
3.4 2.4 2.0 2.8
125 250 500
20.2 22.5 29.2
5.0 4.2 3.1
15.2 18.3 26.1
34.1 33.0 35.0
2.9 2.6 3.3
(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. Constant or repetitive exposure
to impulsive noise may lead to serious injury,
including temporary or permanent deafness. The
Noise Reduction Rating (NRR) calculated from
the attenuation data is 25 dB. Earmuffs must be
properly fitted to attenuate noise effectively. Refer
to instructions.
NOTE: The Noise Reduction Rating is derived
from testing procedures at an independent
laboratory and in accordance to acceptable
A.N.S.I. standards. Actual noise reduction can vary
from laboratory results as labelled. Protection is
maximized when: proper protector is selected for
application, a good training program is utilized
and proper fitting techniques are followed.
1000 2000 4000
35.9 34.1 35.0
2.8 2.4 2.6
33.1 31.7 32.4
NRR
25 dB
35.2 35.2
Canada
Class A(L)
2.1 2.2
8000
SLC
35.2
31 dB
Class 5
2.9
32.3
80
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