5
Appro
70
60
50
40
30
20
63
125
250
500
1000
2000
4000
8000
10
0
NC60
NC50
NC40
NC30
NC20
Approximate minimum
audible limit on continuous noise
OCTAVE BAND PRESSURE LEVEL (dB) 0dB = 20
µ
Pa
OCTAVE BAND CENTER FREQUENCIES (Hz)
Hi
Lo
36
SPL(dB)
25
<50Hz>
NOTCH
High speed
Low speed
NOISE CRITERION CURVES
2m
Aux.duct
1m
1.5m
Measurement location
NOTE: The sound level is measured in an anechoic room where echoes are few, when compressor stops. The sound
may be bigger than displayed level under actual installation condition by surrounding echoes. The sound level
can be higher by about 2 dB than the displayed level during cooling and heating operation.
SEZ-KC25VA.W
