
32
0
10
20
30
40
50
60
70
125 250 500 1000 2000 4000 8000
Octave-band frequency ( Hz)
Sound pressure level (dB, re f 20 Pa)
NC-40
NC-35
NC-25
NC-20
NC-45
NC-50
S- Hi fan
Low f an
Hi g h fan
NC-30
Mediumfan
M easu red in anech o ic ro o m at 1 .4m be low t he centre o f t he un it
Tes ted with 2m length du ct at th e air discha rge outlet and a ir r eturn inlet
MCC038C/CR NC Curves
0
10
20
30
40
50
60
70
125 250 500 1000 2000 4000 8000
Octave-band frequency ( Hz)
Sound pressure level (dB, re f 20 Pa)
NC-40
NC-20
NC-45
NC-50
S- Hi f an
Low f an
Hi g h fan
NC-25
NC-30
Mediumfan
NC-35
M easu red in anech o ic ro o m a t 1.4 m be lo w the cent re o f the unit
Tested with 2m length duct at the ai r di scha rge o utlet and ai r r eturn inlet
MCC040C/CR NC Curves
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