344
14.8 Sound pressure level
Unit
Air
Air outlet duct
Air return duct
Outlet side
1.4m
Sound level meter
Testing position just below the central of the unit
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(2) Testing condition:
a. Unit running in the standard condition
b. Test in the semi-anechoic chamber
c. Noise level varies from the actual factors such as room structure, etc.
(1) Testing illustrate:
(3) Octave band level:
Octave band sound pressure level dB
70
60
40
30
20
10
63 125 250 500 1000 2000 4000 8000
50
Limit of
audible
continuous
noise
Octave band center frequency (HZ)
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