5
NOISE CRITERIA CURVES
4
90
80
70
60
50
40
30
20
10
63
125
250
500
1000
2000
4000
8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCT
A
VE 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
MUH-GA35VB
COOLING
FUNCTION
49
HEATING
SPL(dB
(A)
)
LINE
OUTDOOR UNIT
MICROPHONE
1m
90
80
70
60
50
40
30
20
10
63
125
250
500
1000
2000
4000
8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCT
A
VE 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
COOLING
FUNCTION
47
HEATING
SPL(dB
(A)
)
LINE
OB387B-1.qxp 07.5.23 2:48 PM Page 5
