
33
0
10
20
30
40
50
60
70
125 250 500 1000 2000 4000 8000
Octave-band frequency (Hz)
Sound pressure level (dB, ref 20 Pa)
NC-40
NC-25
NC-20
NC-45
NC-50
S-Hi fan
Low f an
NC-30
Hig h f an
Medium
NC-35
M easured in anechoic roo m at 1.4m below the centre of the unit
Tested with 2m length duct at the air discharge outlet and air return inlet
0
10
20
30
40
50
60
70
125 250 500 1000 2000 4000 8000
Octave-band frequency (Hz)
Sound pressure level (dB, ref 20 Pa)
NC-40
NC-20
NC-45
NC-50
S-Hi fan
Low fan
NC-25
NC-30
Hig h f an
Medium
NC-35
M easured in anechoic room at 1.4m below the centre of the unit
Tested with 2m length duct at the air discharge outlet and air return inlet
MCC050C/CR NC Curves
MCC060C/CR NC Curves
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