12
Ear Muffs
Frequency (HZ)
125
250
500
1000 2000 3150 4000 6300 8000
Mean Attenuation (dB)
18.0
18.9
25.0
30.0
32.1
37.9
37.9
36.8
34.1
Standard Deviation (dB)
2.9
1.7
1.7
2.0
2.3
2.9
3.5
3.3
4.1
NRR=23 dB; Headband Force=2.7 lbs.
TEST REPORT ID: Q5342A, Michael and Associates, Inc.
Important:
NRR is not attenuation, and the labeled NRR for most ear muffs does not represent typical
performance. While the labeled NRR is 23 dB, the typical user can expect to obtain a higher level of
attenuation across frequencies when the ear muffs are used as directed and the device is off.
NRR (NOISE REDUCTION RATING)
SNR (SINGLE NUMBER RATING)
Classification
:
NoizeBarrier TAC EN 352-1: 2002
Frequency (HZ)
125
250
500 1000 2000 4000 8000 SNR
= 28 dB
Mean Attenuation (dB)
18.7 19.2 24.9
32.1
30.9
38.3
34.4
H
= 30 dB
Standard Deviation (dB)
3.5
3.1
2.9
3.5
3.3
3.1
3.6
M
= 25 dB
Assumed Protection Value (dB) 15.2 16.1 22.0
28.6
27.5
35.2
30.8
L
= 19 dB
EN 352-4: 2001 +A1: 2005
Criterion levels
H = 115.5 dBA
M = 107.0 dBA
L = 96.0 dBA
Sound pressure level of external noise for which sound pressure level under the earmuff first exceeds
85 dBA
EN 352-6:2002
Electrical input for which the mean + one standard deviation of A-weighted diffuse-field related
sound = 96.0 mV pressure level is equal 82 dB
The European Union testing was conducted by Michael and Associates, Inc.
Report Q5796A, Q6030A and Q6032A.
This product is in compliance with EN 352-1: 2002, EN 352-4: 2001, EN 352-6: 2002 and 2016/425.
Notified Body responsible for EU type examination: SATRA Technology Europe, Ltd.,
Bracetown Business Park, Clonee, Co. Meath, D15 YN2P, Ireland (Notified Body No. 2777)
Declaration of Conformity available
at www.otto-comm.com
23
DECIBELS
(WHEN USED AS DIRECTED)
THE RANGE OF NOISE REDUCTION RATINGS FOR EXISTING
HEARING PROTECTORS IS APPROXIMATELY 0 TO 30
(HIGHER NUMBERS DENOTE GREATER EFFECTIVENESS)
OTTO ENGINEERING, INC.
Ear Muffs
Federal law prohibits
removal of this label
prior to purchase.
LABEL REQUIRED BY U.S.
E.P.A. REGULATION 40
CFR Part 211, Subpart B.
Noise
Reduction
Rating
2777
