A) STANDARD EN 352-1:2020
3M strongly recommends personal fit testing of hearing protectors. Research suggests that users may receive less noise
reduction than indicated by the attenuation label value(s) on the packaging due to variation in fit, fitting skill, and motivation of
the user. Refer to applicable regulations and guidance on how to adjust attenuation label value(s). In the absence of
applicable regulations, it is recommended that the attenuation label value(s) be reduced to better estimate typical protection.
The attenuation rating (SNR) was obtained with the device powered off.
A:A Headband earmuffs with foam cushions
MT14H418A**
A:2 MV (dB)
A:3 SD (dB)
A:4 APV = MV - SD (dB)
A:6: S, M, L
A:B Headband earmuffs with gel cushions
MT14H418A** with HY80
A:2 MV (dB)
A:3 SD (dB)
A:4 APV = MV - SD (dB)
A:6: S, M, L
A:C) Dual protection mode, ComTac™ VIII Headset with
MT14H418A** with 3M™ E-A-R™ Classic Earplugs
A:2 MV (dB)
A:3 SD (dB)
A:4 APV = MV - SD (dB)
A:1 f (Hz)
125
250
500 1000 2000 4000 8000
12.6
18.1
29.1
30.5
2.3
1.5
3.3
2.6
10.3
16.6
25.8
27.9
A:1 f (Hz)
125
250
500 1000 2000 4000 8000
12.1
17.8
29.2
34.9
2.2
1.4
2.9
2.2
9.9
16.4
26.3
32.7
E-A-R™ Classic Earplugs
A:1 f (Hz)
125
250
500 1000 2000 4000 8000
34.4
44.4
53.2
45.8
4.7
4.3
6.4
5.1
29.7
40.1
46.8
40.7
H
31.9
43.7
39.4
34
2.2
2.5
2.7
1.3
29.7
41.2
36.7
33
H
33.9
43.2
39.3
36.3
2.2
3.2
3.3
1.2
31.7
40.0
36.0
35
H
40.0
48.7
43.8
41.4
4.9
4.6
4.0
4.1
35.1
44.1
39.8
37
A:5
M
L
SNR
27.4
19.7
29.8
339 g
1.1
1.6
1.0
26
18
29
A:5
M
L
SNR
28.1
19.3
30.4
374 g
1.3
1.8
1.2
27
18
29
A:5
M
L
SNR
42.8
41.1
43.2
339 g
3.5
3.7
3.4
39
37
40