Sanyo SGP-E70J2GU2 - 6 Sound-Proofing Measure; Installation Location and Sound-Proofing Measures; Attenuation of Sound through Dstance

Design
D - 23
Condition Ordi nary standards Special standards
Morning Daytime Evening Night
Area type
Sound
level
(phon)
Time
Sound
level
(phon)
Time
Sound
level
(phon)
Time
Sound
level
(phon)
Time
Near schools or
hospitals
(approximately
50m)
Type
1
Housing area,
school area, etc.
40 45 40 40
Same as the
standards on the
left
Type
2
Housing area,
undesignated area
45 50
8:00 am to
7:00 pm
45
7:00 pm to
11:00 pm
45
Type
3
Commercial, light
industrial,
industrial areas,
etc.
55 60 55 50
11:00 pm to
following
day 6:00 am
Type
4
Shopping area,
specially designated
area
60
6:00 am to
8:00 am
70
8:00 am to
8:00 pm
60
8:00 pm to
11:00 pm
55
5 phon lower
than the
standards on the
left
distance attenuation of operating sound
distance (m)
attenuation value dB(A)
attenuation for unit operating sound
attenuation fo
r a point sound source
(A)
(B)
Note: The values for unit operating sound are for a location with few reflecting
surfaces (bottom surface concrete)
(1) Installation location and sound-proofing measures
● When there is no suitable installation location, and it is necessary to install in a narrow location, where there
are other houses, offices or buildings nearby, it is necessary to provide walls, sound absorption chambers or
other secondary sound-proofing measures.
● Secondary sound-proofing measures include
• Attenuation through distance
• Sound-proofing with a noise barrier
• Sound-proofing using a sound absorbing chamber
• Sound-proofing by vibration isolation (anti-vibration pad, flexible couplings, etc.)
The following criteria are from Tokyo Pollution Prevention Regulations.
Criteria for every day sound levels (from Tokyo Pollution Prevention Regulations)
(2)Attenuation of sound through distance
● The figure on the right shows the Figure 1
attenuation of sound with distance.
This is based upon operating sound at 1m from
the source of the sound.
(e.g.)
For a type 280 outdoor unit, the sound
at 3m distance in the 50Hz range, the
specification gives 56dB(A). On the
figure to the right for the 3m distance
point proceed vertically downward to the
crossing point (a) and then horizontally
to the left to the point (b): an
attenuation of 6.8dB(A) is obtained.
Therefore 56-6.8=49.2dB(A)
6. Sound-proofing measures