Airwell EFL 100-3R410, Technical Manual, Page: 252 / 328

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4 - 119
3-WAY FLOW LOGIC Unit Specifications
7. Concealed Duct Hi g h Static Pressure Type
7-4. Noise Criterion Curves
MODEL : ST-NDHP 24
SOUND LEVEL : HIGH 44 dB(A), NC 3 8
CONDITION : Under the unit 1.5 m
SOURCE : 220 - 230 - 240 V, 1 Phase, 50 Hz
MODEL : ST-NDHP 4 8
SOUND LEVEL : HIGH 47 dB(A), NC 42
CONDITION : Under the unit 1.5 m
SOURCE : 220 - 230 - 240 V, 1 Phase, 50 Hz
MODEL : ST-NDHP 36
SOUND LEVEL : HIGH 45 dB(A), NC 39
CONDITION : Under the unit 1.5 m
SOURCE : 220 - 230 - 240 V, 1 Phase, 50 Hz
90
8 0
70
60
50
40
30
20
10
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
63 125 250 500 1000 2000 4000 8 000
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
90
8 0
70
60
50
40
30
20
10
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
63 125 250 500 1000 2000 4000 8 000
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
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
90
8 0
70
60
50
40
30
20
10
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
63 125 250 500 1000 2000 4000 8 000
NC-70
NC-60
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)
Sound Pressure Le
v
el (dB)
(0 dB = 0.0002
μ
bar)
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 119