4
4
- 105
3-WAY FLOW LOGIC Unit Specifications
6. Concealed Duct Type
MODEL
: ST-NDLP 36
SOUND LEVEL : HIGH 3
8
dB(A), NC 30 / LOW 31 dB(A), NC 21
CONDITION
: Under the unit 1.5 m
SOURCE
: 220 - 230 - 240 V, 1 Phase, 50 Hz
REMARK
S
:
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.
NOTE
MODEL
: ST-NDLP 4
8
SOUND LEVEL : HIGH 40 dB(A), NC 33 / LOW 33 dB(A), NC 25
CONDITION
: Under the unit 1.5 m
SOURCE
: 220 - 230 - 240 V, 1 Phase, 50 Hz
60
50
40
30
20
10
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
63
125
250
500 1000 2000 4000
8
000
NC-50
NC-40
NC-30
NC-20
60
50
40
30
20
10
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
63
125
250
500 1000 2000 4000
8
000
NC-50
NC-40
NC-30
NC-20
Sound Pressure Le
v
el (dB)
(0 dB = 0.0002
μ
bar)
Sound Pressure Le
v
el (dB)
(0 dB = 0.0002
μ
bar)
Frequency at center of sound pressure band (Hz)
Frequency at center of sound pressure band (Hz)
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
8
000 Hz, and select the
corresponding maximum value indicated on the vertical axis.
04-218 Airwell-4_6-7.qxp 01/06/2007 13:24 Page 105