26 _ Ceiling Concealed Duct(High Static)
Indoor Units
9. Sound Levels
Sound Pressure Level (50Pa)
Octave Band Sound Pressure Level (0 dB = 20 μPa)
Octave Band Sound Pressure Level (0 dB = 20 μPa)
Octave Band Center Frequency (Hz)
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)
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    
ARNU48GBRA4 ARNU54GBRA4
n High
▲ Mid
l Low
n High
▲ Mid
l Low
Model
Sound Pressure Levels (dB(A),H-M-L)
External Static Pressure (Pa)
50 70 100 140 170
ARNU48GBRA4 38-36-34 39-37-35 40-39-37 41-40-38 42-41-39
ARNU54GBRA4 39-37-35 40-38-36 41-39-38 - -
Sound Pressure Level (70Pa)
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    
ARNU48GBRA4
ARNU54GBRA4
n High
▲ Mid
l Low
n High
▲ Mid
l Low