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-35
NC-25
NC-20
NC-45
NC-50
Hig h f an
Lo w f an
NC-30
Medium fan
M easured in anecho ic ro o m at 1m in fro nt of the unit and 1m below the air discharge o pening
MCM050D/DR 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, ref 20 Pa)
NC-20
NC-30
NC-25
NC-35
NC-40
NC-45
NC-50
Lo w f an
Medium fan
Hi g h f an
M easur ed in anecho ic r o o m at 1 m in f ro nt o f t he unit and 1 m b el o w t he air d ischarg e
NC-55
MCM061/62 C/CR NC Curves
Page 18
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