98
90
80
70
60
50
40
30
20
10
63
125
250
500
1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
OCT
AVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 bar)
BAND CENTER FREQUENCIES, Hz
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
PUZ-HA30NHA4
PUZ-HA36NHA4
COOLING
MODE
HEATING
52
SPL(dB)
53
LINE
5 ft
3.3 ft
MICROPHONE
UNIT
GROUND