Sound pressure level (dB, ref 20µPa)
0
10
20
30
40
50
60
70
125 250 500 1000 2000 4000 8000
Octave-band frequency (Hz)
NC- 40
NC- 35
NC- 30
NC- 25
NC- 45
NC- 50
High fan
Low fan
Medium fan
Sound pressure level (dB, ref 20µPa)
0
10
20
30
40
50
60
70
125 250 500 1000 2000 4000 8000
Octave-band frequency (Hz)
NC-4 0
NC-3 5
NC-2 0
NC-4 5
NC-5 0
High fan
Low fan
NC-3 0
Medium fan
NC-2 5
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