9. Sound Levels
Ceiling Concealed Duct(Middle Static) _ 31
Indoor Units
Model
Sound Pressure Levels (dB(A),H-M-L)
External Static Pressure (Pa)
39 49 59 147
ARNU28GM2A4 
ARNU36GM2A4 
ARNU42GM2A4 
ARNU48GM3A4 
ARNU54GM3A4
Sound Pressure Level (39Pa)
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 ARNU48GM3A4
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    
ARNU54GM3A4
n High
▲ Mid
l Low
36-34-33 36-34-33 36-34-33 40-39-38
36-34-33 37-36-34 37-36-34 42-40-39
- 38-37-36 38-37-36 44-43-42
39-37-35 39-37-35 40-38-36 43-42-41
42-40-39 42-40-39 41-41-40 45-44-43