9. Sound Levels
Ceiling Concealed Duct(Middle Static) _ 33
Indoor Units
Sound Pressure Level (147Pa)
Octave Band Center Frequency (Hz)
Octave Band Sound Pressure Level (0 dB = 20 μPa)
10 
20 
30 
40 
50 
60 
70 
80 
63  125  250  500  1 000  2 000  4 000  8 000 
NC-15 
NC-20 
NC-25 
NC-30 
NC-35 
NC-40 
NC-45 
NC-50 
NC-55 
NC-60 
NC-65 
Approximate
Hearing
Threshold    
Octave Band Center Frequency (Hz)
Octave Band Sound Pressure Level (0 dB = 20 μPa)
10 
20 
30 
40 
50 
60 
70 
80 
63  125  250  500  1 000  2 000  4 000  8 000 
NC-15 
NC-20 
NC-25 
NC-30 
NC-35 
NC-40 
NC-45 
NC-50 
NC-55 
NC-60 
NC-65 
Approximate
Hearing
Threshold    
Octave Band Center Frequency (Hz)
Octave Band Sound Pressure Level (0 dB = 20 μPa)
10 
20 
30 
40 
50 
60 
70 
80 
63  125  250  500  1 000  2 000  4 000  8 000 
NC-15 
NC-20 
NC-25 
NC-30 
NC-35 
NC-40 
NC-45 
NC-50 
NC-55 
NC-60 
NC-65 
Approximate
Hearing
Threshold    
ARNU28GM2A4 ARNU36GM2A4 ARNU42GM2A4
n High
▲ Mid
l Low
n High
▲ Mid
l Low
n High
▲ Mid
l Low
Octave Band Center Frequency (Hz)
Octave Band Sound Pressure Level (0 dB = 20 μPa)
10 
20 
30 
40 
50 
60 
70 
80 
63  125  250  500  1 000  2 000  4 000  8 000 
NC-15 
NC-20 
NC-25 
NC-30 
NC-35 
NC-40 
NC-45 
NC-50 
NC-55 
NC-60 
NC-65 
Approximate
Hearing
Threshold    
Octave Band Center Frequency (Hz)
Octave Band Sound Pressure Level (0 dB = 20 μPa)
10 
20 
30 
40 
50 
60 
70 
80 
63  125  250  500  1 000  2 000  4 000  8 000 
NC-15 
NC-20 
NC-25 
NC-30 
NC-35 
NC-40 
NC-45 
NC-50 
NC-55 
NC-60 
NC-65 
Approximate
Hearing
Threshold    
ARNU48GM3A4 ARNU54GM3A4
n High
▲ Mid
l Low
n High
▲ Mid
l Low
Octave Band Center Frequency (Hz)
Octave Band Sound Pressure Level (0 dB = 20 μPa)
10 
20 
30 
40 
50 
60 
70 
80 
63  125  250  500  1 000  2 000  4 000  8 000 
NC-15 
NC-20 
NC-25 
NC-30 
NC-35 
NC-40 
NC-45 
NC-50 
NC-55 
NC-60 
NC-65 
Approximate
Hearing
Threshold    
Octave Band Center Frequency (Hz)
Octave Band Sound Pressure Level (0 dB = 20 μPa)
10 
20 
30 
40 
50 
60 
70 
80 
63  125  250  500  1 000  2 000  4 000  8 000 
NC-15 
NC-20 
NC-25 
NC-30 
NC-35 
NC-40 
NC-45 
NC-50 
NC-55 
NC-60 
NC-65 
Approximate
Hearing
Threshold    
ARNU48GM3A4 ARNU54GM3A4
n High
▲ Mid
l Low
n High
▲ Mid
l Low