Technical Information (EN352)
Sound Attenuation
Mean Attenuation
Standard Deviation
Assumed Protection
H
=32
M
=27
L
=25
SNR
=31
26.1
5.6
20.5
66.6
27.5
5.5
22.0
27.8
4.9
22.9
31.4
5.9
25.5
34.3
8.2
26.0
34.9
4.5
30.4
41.4
3.6
37.7
44.4
5.0
39.4
68.0
68.0 68.0 68.1 68.5 69.2 70.7 73.7
Frequency (Hz)
Medium
External Level dB (A)
63
125
250
500 1000 2000 4000 8000
59.5
64.2
69.2 74.2 79.2 84.2 89.2 94.1
Criterion Levels
H
>99
M
>99
L
>99
SNR =
Single Number Rating attenuation
H =
High frequency attenuation
M =
Medium frequency attenuation
L =
Low frequency attenuation
EN352-2:2002 EN352-7:2002
Tested by:
SATRA Ltd, Wyndham Way, Telford Way, Kettering, Northamptonshire, NN16
8SD. UK. (Notified Body No. 0321).
Tests carried out at maximum volume
Further information can be obtained from Puretone Ltd, 9-10 Henley Business
Park, Trident Close, Medway City Estate, Rochester, Kent. ME2 4FR. UK.
15
68.6
70.1
69.6 69.2 69.2 70.3 71.4 72.0 73.2
High
External Level dB (A)
59.5
64.5
69.5 74.5 79.5 84.5 89.5 94.5 99.6
99.1
64.9
66.1
66.4 66.5 66.8 67.5 68.8 71.1 74.7
Low
External Level dB (A)
59.5
64.5
69.5 74.5 79.5 84.4 89.3 94.2 99.0