Engineering Bulletin

DUCT (LOW STATIC) INDOOR UNITS
Measurements taken with no attenuation and units operating at full
load normal operating condition.
Sound level will vary depending on a range of factors such as
construction (acoustic absorption coefficient) of particular area in
which the equipment is installed.
Sound power levels are measured in dB(A)±3.
Tested in anechoic chamber per ISO Standard 3745.
Model No.
Sound Pressure Levels (dB[A]) (Cooling and Heating)
High Fan Speed
Medium Fan
Speed
Low Fan Speed
LMDN095HV 32 26 25
LMDN125HV 33 31 26
LMDN185HV 34 31 29
 Sound Pressure Level Measurement Location.
Sound Pressure Levels (dB[A]).
 Sound Pressure Level Diagrams.
Acoustic Data
4.9 ft.
Ceiling
6.6 ft.
Microphone
10
20
30
40
50
60
70
80
63 125 250 500 1000 2000 4000 8000
Octave Band Sound Pressure Level (0 dB = 20µPa)
Octave Band Center Frequency (Hz)
NC-15
NC-20
NC-25
NC-30
NC-35
NC-40
NC-45
NC-50
NC-55
NC-60
NC-65
Approximate
Hearing
Threshold
10
20
30
40
50
60
70
80
63 125 250 500 1000 2000 4000 8000
NC-15
NC-20
NC-25
NC-30
NC-35
NC-40
NC-45
NC-50
NC-55
NC-60
NC-65
Approximate
Hearing
Threshold
Octave Band Sound Pressure Level (0 dB = 20µPa)
Octave Band Center Frequency (Hz)
10
20
30
40
50
60
70
80
63 125 250 500 1000 2000 4000 8000
NC-15
NC-20
NC-25
NC-30
NC-35
NC-40
NC-45
NC-50
NC-55
NC-60
NC-65
Approximate
Hearing
Threshold
Octave Band Sound Pressure Level (0 dB = 20µPa)
Octave Band Center Frequency (Hz)
LMDN095HV LMDN125HV LMDN185HV
Due to our policy of continuous product innovation, some specications may change without notication.
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88 | DUCT (LOW STATIC)
Multi F and Multi F MAX Indoor Unit Engineering Manual
A