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TABLE 1 - ATTENUATION
High
f (Hz)
Mf (dB)
sf (dB)
APV (dB)
H = 38 dB, M = 33 dB, L = 26 dB, SNR = 36 dB
Medium
f (Hz)
Mf (dB)
sf (dB)
APV (dB)
H = 37 dB, M = 29 dB, L = 22 dB, SNR = 32 dB
Low
f (Hz)
Mf (dB)
sf (dB)
APV (dB)
H = 34 dB, M = 25 dB, L = 17 dB, SNR = 28 dB
TABLE 2 - EAR-MUFF SIZES AND HELMET COMBINATIONS
Manufacturer / model
MSA / V-GARD
MSA / V-GARD 500-520
MSA / V-GARD 200
MSA / V-GARD 930-950
MSA / Thermalgard
MSA / V-Gard H1
MSA / Gallet F2XR
Centurion / 1100-1125
SCOTT / Style 300
AUBOUEIX / Iris 2
3M / G3000-G3001
SCOTT / Style 600
JSP Evolite
88
125
250
500
23.4
25.7
37.3
2.8
3.2
3.2
20.6
22.5
34.1
125
250
500
18.3
21.2
31.1
2.1
2.8
3.4
16.2
18.3
27.7
125
250
500
14.8
16.4
25.2
3.2
2.7
2.4
11.5
13.7
22.8
Adapter
Type No
14
14
14
14
14
14
14
1
1
2
2
2
14
1000
2000
4000
41.8
39.2
40.1
3.5
2.7
2.1
38.3
36.5
38
W = 377 g
1000
2000
4000
38.5
38.9
42.0
3.0
3.0
4.7
35.5
35.8
37.3
W = 312 g
1000
2000
4000
33.9
35.9
41.3
3.6
3.0
4.0
30.2
32.9
37.3
W = 242 g
Size range
Low
Medium
S, M, L
S, M, L
S, M, L
S, M, L
M, L
M, L
M, L
M, L
S, M, L
S, M, L
M, L
M, L
S, M, L
S, M, L
M, L
M, L
M, L
M, L
S, M, L
S, M, L
M, L
M, L
S, M, L
S, M, L
M, L
M, L
8000
41.1
3
38.1
8000
41.3
4.8
36.5
8000
41.5
5.0
36.5
High
S, M, L
S, M, L
M, L
M, L
S, M, L
M, L
-
M, L
M, L
S, M, L
S, M, L
S, M, L
M, L
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