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9. Noise Criterion Curves
Indoor Unit
Notes:
-Sound measured at 1.4m away from the noisiest location of the unit.
-Data is valid at free field condition
-Data is valid at nominal operation condition
-Reference acoustic pressure OdB = 20μPa
-Sound level will vary depending on a range of factors such as
the construction -(acoustic absorption coefficient) of particular
room
in which the equipment is installed.
-The operating conditions are assumed to be standard.
IB2-XY 35M
0
10
20
30
40
50
60
70
80
63 125 250 500 1000 2000 4000 8000
Octave Band Sound Pressure Level /dB (0dB = 0.0002
μbar)
Band Center Frequency /Hz
H M L
NC-70
NC-60
NC-50
NC-40
NC-30
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