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1-8. Noise Criterion Curves
1-8. Noise Criterion Curves
Concealed-Duct Type
Concealed-Duct Type
MODEL
SOUND LEVEL
CONDITION
60
50
40
30
20
Approximate
minimum
audible limit for
continuous noise
10
63
125 250
Overall
Frequency at center of sound pressure band (Hz)
MODEL
SOUND LEVEL
CONDITION
60
50
40
30
20
Approximate
minimum
audible limit for
continuous noise
10
63
125 250
Overall
Frequency at center of sound pressure band (Hz)
REMARKS:
1. Value obtained in the actual place where the unit is
installed may be slightly higher than the values shown
in this graph because of the conditions of operation,
the structure of the building, the background noise and
other factors.
2. The test results were obtained from an anechoic room.
3. The layout of the testing condition is shown at right.
NOTE
To evaluate the noise level, the maximum value of the measured sound pressure level is used. Read the value at
each frequency level (on horizontal axis, center of the sound pressure band) from 63 Hz to 8000 Hz, and select the
corresponding maximum value indicated on the vertical axis.
: SPW-US125H
: STRONG 32 dB(A)
WEAK 28 dB(A)
: 1.5 m directly below unit
NC-50
NC-40
NC-30
NC-20
500
1000
2000
4000
8000
: SPW-US185H
: STRONG 35 dB(A)
WEAK 31 dB(A)
: 1.5 m directly below unit
NC-50
NC-40
NC-30
NC-20
500
1000
2000
4000
8000
MODEL
: SPW-US165H
SOUND LEVEL
: STRONG 34 dB(A)
WEAK 30 dB(A)
CONDITION
: 1.5 m directly below unit
60
50
40
30
20
Approximate
minimum
audible limit for
continuous noise
10
63
125 250
Overall
Frequency at center of sound pressure band (Hz)
Air discharge
(Concealed-Duct Type)
1-302
Both 50Hz / 60Hz
Strong
Weak
NC-50
NC-40
NC-30
NC-20
500
1000
2000
4000
8000
Auxiliary Duct
Auxiliary Duct
of 2 m length
of 1 m length
Air intake
Unit
1.5 m directly below unit
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