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NOISE CRITERIA CURVES
4
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling :DB35: WB24:
Heating :DB 7: WB 6:
MUH-GA25VB- E1
MUH-GA35VB- E1
COOLING
FUNCTION
49
HEATING
SPL(dB
(A)) LINE
OUTDOORUNIT
MICROPHONE
1m
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling :DB35: WB24:
Heating :DB 7: WB 6:
MUH-GA20VB- E1
COOLING
FUNCTION
47
HEATING
SPL(dB
(A)) LINE
OB387-1.qxp 05.2.21 10:03 AM Page 7