Mitsubishi Electric Lossnay LGH-F1200RX5-E, Technical Manual

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U-31
CHAPTER 3
•
General Technical Considerations
6. Lossnay Core Sound Reducing Properties Test
Because the Lossnay Core is made of many layers of plates and the permeable holes are extremely small, the core has
outstanding sound reducing properties and is appropriate for ventilation in soundproof rooms.
For example, LGH-100RX
3
-E has sound reducing characteristics of 35.0dB with a center frequency of 500Hz, which means
that a sound source of 84.4dB can be shielded to 49.4dB.
Test number
Sound Reducing Effect Test Results
Standar
d
Test Method
Client
Name
Address
Trade name
Main composition
Manufacture date
Size (unit : mm)
Note
Date of test
Sound transmitting size
Air temperature, Relative humidity May 18, 2001
Ф254 mm × 2
22.0∞C, 62%RH (Receiving room)
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
83.3
83.8
85.5
86.0
86.1
85.0
86.2
84.4
84.7
85.5
87.0
89.2
89.3
90.7
92.8
83.4
95.0
95.0
59.3
62.8
61.0
58.7
58.3
57.0
54.3
49.4
50.7
48.7
47.7
47.7
47.4
47.0
48.2
48.2
48.8
47.6
24.0
21.0
24.5
27.3
27.8
28.0
31.9
35.0
34.0
36.8
39.3
41.5
41.9
43.7
44.6
45.2
46.2
47.4
2.65
3.21
3.69
3.48
3.54
3.96
4.40
4.62
4.80
5.06
5.58
6.26
7.03
7.57
8.62
10.19
12.42
15.51
10
6
9
12
12
12
16
18
17
20
22
24
23
25
25
25
25
26
11
6
10
13
13
12
16
19
17
20
22
24
23
25
25
25
25
26
Center
frequency
(Hz)
Equivalent
absorption
area in receiving
room A (m
2
)
Sound
transmission
loss
TL (dB)
Test
laboratory
Revised sound
transmission
loss
TLc (dB)
Average sound pressure level (dB)
Level
difference D
Receiving
room Lr
Source
room Ls
IVA-01-06
Mitsubishi Electric Corporation
1-3, Komaba-cho, Nakatsugawa-shi,
Gifu 508-8666, Japan
LGH-100RX
3
-E
Air-to-Air Energy Recovery Ventilator
May 18, 2001
W1231 × H398 × D1521
(ANNEXED DRAWINGS No.1,2 show details.)
Test Specimen
Test R
esults
Test method was determined according to JIS A 1416 : 1994
"Method for laboratory measurement of sound transmission
loss" and Architectural Institute of Japan Standard
"Measurement method on sound transmission loss of small
building elements".
Notes:
1. The graph shows level difference with (revised) sound transmission loss.
2. Test specimen area (Sound transmitting area) is:
S = 0.10134m
2
(Ф254mm × 2) for calculating (revised) sound transmission
loss.
3. An arithmetic mean of revised sound transmission loss (1/3 octave, 125Hz
- 4000Hz)....18.4dB
Iwao Kurahashi (Head)
Takao Waki (Section chief)
Mitsuo Morimoto (Section chief)
Joint adapter in the sound receiving room side
(Portion A in ANNEXED DRAWING No.1) had
been filled with oil clay and then covered with
onefold aluminum tape, sound insulation sheet
and glass wool around duct successively.
Heat & Acoustics Laboratory, Building Physics Dept.
General Building Research Corporation of Japan
5-8-1 Fujishirodai, Suita-shi, Osaka 565-0873, Japan
Responsible parties
Sound source side
Sound source side Sound receiving side
(Reverberation room No. 2)
178.5m
3
(Reverberation room No. 3)
180.0m
3
Volume
Test specimen
Test
specimen
SP.
Sound receiving side
Section
300
5560
Air layer (t50)
Chain block (2t)
Neoprene rubber
Test specimen
Filled with sand
F. L.
Filled inside with sand
Mortared both sides (15mm)
Cavity concrete block (t190)
300
Amplifier 2 ch selector
MIC.
Equalizer Real time analyzer
Noise generator
Fig. 1 Testing setup (Unit : mm)
Computer system
Printer
Air-to-Air Energy
Recovery Ventilator
LGH-100RX
3
-E
Level difference between
the source room and the
receiving room
Revised sound
transmission loss
Sound transmission loss
70
60
50
40
30
20
10
0
125 250 500 1000 2000 4000
Center frequency (Hz)
Sound transmission loss (dB)