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7. Lossnay Core's Soundproofing Properties Test
As the Lossnay Core is made of paper and the permeable holes are extremely small, the Core has outstanding soundproofing
properties and is appropriate for ventilation in soundproof rooms.
For example, the exposed ceiling-type LGH-50E has soundproofing characteristics of 33.9 dB with a center frequency of 400
Hz. This means that a sound source of 96.9 dB can be shielded to 63 dB.
Soundproofing effect test results
For Mitsubishi Electric Corporation
Nakatsugawa Works
The results of the tests are as noted below.
General Building Research Corporation
General Manager, S. Okushima
Certificate
number
Product name
Item name
Application
Date of
manufacture
Place of
General Building Research Corporation
assembly
Dimensions
Area
concentration
Remarks
An existing hole (4000 mm × 3000 mm) was
covered with a hollow concrete block with
Cultures,
double-faced mortar (thickness 20 mm each),
specimen
with a wood frame with inner dimension of
installation
580 mm × 190 mm × 230 mm being installed.
method at
The supply/exhaust box and duct was
test facility
mounted in this, and the main unit and
weather cover was mounted.
Oil clay was filled around the sound source
Peripheral
sections
Specimen configuration (dimensions mm)
Refer to appendix 1, 2 for details.
Internal flange hole
Steel plate
with fixing screw
thickness: 0.8
Flange steel plate thickness: 1.6
Duct steel plate thickness: 1.6
Urethane foam thickness: 15 0.072 m
Feed/exhaust box
Steel plate thickness: 1.0
Remarks
Urethane foam (15 mm thick) was stuck onto the inside of the duct
and feed/exhaust box.
IVA-78-122
LGH-50E
Heat exchange-type ventilator
Ventilation
October 1978
W 1250 × H 310 × D 1589
———
Weather cover
Steel plate thickness: 0.6
Wood frame
thickness: 20
2
Mortar
CHAPTER 3
General Technical Considerations
General Building Reseach Corporation
Fujishirodai 5-125, Suita-shi, Osaka-Fu, Japan
Person in charge of testing: Takeshi Tokura
Testing facility
Address
Company
name
Testing
method
Measurement
date
Measurement
conditions
Soundproof area
dimensions
Centre frequency
Average
level
S: 1/20
Average
level
Average sound
pressure level
difference (dB)
Sound absorbed
by reverberation
chamber on
reception side (m
Sound transmis-
sion loss (dB)
Refer to page 35 for details of test results
Remarks
The soundproofed area of the specimen is small in this test, and as
the transmission of sound though the surrounding concrete block wall
cannot be ignored, the concrete block wall was measured after the
main test, and the main test measurement results were corrected.
Persons in charge of testing: Mitsuo Morimoto, Toshifumi Murakami
Test number
Acceptance data :
February 22, 1979
Report
:
May 24, 1979
General Building Research Corporation
1-3 Komanba-cho, Nakatsugawa, Gifu
Mitsubishi Electric Corporation
Nakatsugawa Works
According to "soundproofing effect test" in
Ministry of Construction No. 108
March 9, 1979
Temperature: 12.5°C, humidity: 77%
W 580 × H 190
125 Hz
500 Hz
1
101.5
96.5
2
99.0
—
3
100.0
97.5
4
102.0
—
5
101.5
96.5
100.9
96.9
1
81.5
63.5
2
79.5
—
3
79.5
63.0
4
82.5
—
5
81.5
62.5
81.1
63.0
19.8
33.9
2.79
3.90
2
)
5.8
18.4
No. 122-1
IVA-78-122
2,000 Hz
98.5
—
98.5
—
98.5
98.5
53.0
—
43.0
—
43.5
43.2
55.3
7.22
37.1
33
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