Frequency (Hz)
(B:1)
125
250
500
1000
2000
3150
4000
6300
8000 NRR CSA
Class
Mean attenuation (dB)
(B:2)
18.6
27.4
35.9
38.9
35.8
37.7
37.0
36.4
38.0
26
A
373 g
Std deviation (dB)
(B:3)
4.1
3.3
3.1
2.9
2.9
3.0
2.4
3.8
5.0
Headband with foam cushion
MT15H7AWS6**
ANSI S3.19-1974
Frequency (Hz)
(B:1)
125
250
500
1000
2000
3150
4000
6300
8000 NRR CSA
Class
Mean attenuation (dB)
(B:2)
17.3
24.3
33.4
35.9
35.0
37.8
37.0
37.7
39.8
24
A
357 g
Std deviation (dB)
(B:3)
4.4
4.6
3.7
3.0
3.1
2.4
2.6
2,.6
3,9
Neckband with foam cushion
MT15H7BWS6**
ANSI S3.19-1974
Frequency (Hz)
(B:1)
125
250
500
1000
2000
3150
4000
6300
8000 NRR CSA
Class
Mean attenuation (dB)
(B:2)
19.3
25.1
35.0
38.7
34.5
35.3
34.9
36.1
38.5
26
A
395 g
Std deviation (dB)
(B:3)
3.6
2.9
3.1
2.1
2.5
2.1
2.4
2.8
4.1
Helmet attachment with foam cushion on 3M
TM
H-700 Hard Hat
MT15H7P3EWS6**
ANSI S3.19-1974
B
Frequency (Hz)
(B:1)
125
250
500
1000
2000
3150
4000
6300
8000 NRR CSA
Class
Mean attenuation (dB)
(B:2)
17.5
23.3
34.6
39.2
36.1
38.2
38.5
38.7
40.0
27
A
457 g
Std deviation (dB)
(B:3)
2.6
2.0
3.2
2.8
2.7
2.6
2.1
1.9
2.5
Helmet attachment
with gel cushion
3M
TM
H-700 Hard Hat
MT15H7P3EWS6**
ANSI S3.19-1974
Frequency (Hz)
(B:1)
125
250
500
1000
2000
3150
4000
6300
8000 NRR CSA
Class
Mean attenuation (dB)
(B:2)
16.9
22.5
33.4
39.9
35.2
37.6
36.1
36.7
37.5
27
A
432 g
Std deviation (dB)
(B:3)
2.6
2.2
2.5
1.8
1.9
1.7
2.6
1.8
1.7
Headband with gel cushion
MT15H7AWS6**
ANSI S3.19-1974
Frequency (Hz)
(B:1)
125
250
500
1000
2000
3150
4000
6300
8000 NRR CSA
Class
Mean attenuation (dB)
(B:2)
16.6
22.6
32.3
37.7
37.6
38.7
37.8
39.5
40.3
26
A
425 g
Std deviation (dB)
(B:3)
3.6
2.2
2.4
2.4
2.8
2.9
2.5
2.4
2.0
Neckband with gel cushion
MT15H7BWS6**
ANSI S3.19-1974
