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NC Curves
NC-20
MCK 020A/AR NC Curves
10
20
30
40
50
60
70
125
250
500
1000
2000
4000
8000
Octave-band frequency (Hz)
Sound pressure level (dB, ref 20µPa)
Measured in anechoic room at 1.4m below the facia
NC-40
NC-35
NC-30
NC-25
NC-20
NC-45
NC-50
High fan
Medium fan
Low fan
MCK 025A/AR NC Curves
10
20
30
40
50
60
70
125
250
500
1000
2000
4000
8000
Octave-band frequency (Hz)
Sound pressure level (dB, ref 20µPa)
Measured in anechoic room at 1.4m below the facia
NC-40
NC-35
NC-30
NC-25
NC-45
NC-50
High fan
Medium fan
Low fan
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