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1
1-8. Noise Criterion Curves
Wall-Mounted Type
MODEL
SOUND LEVEL
CONDITION
60
50
40
30
Approximate
minimum
20
audible limit
for continuous
noise
10
63
Overall
Frequency at center of sound pressure band (Hz)
MODEL
SOUND LEVEL
CONDITION
60
50
40
30
Approximate
minimum
20
audible limit
for continuous
noise
10
63
Overall
Frequency at center of sound pressure band (Hz)
: SPW-KR124 / 164GH56 (A/B)
: STRONG 35 dB(A)
MEDIUM 31 dB(A)
WEAK 27 dB(A)
: 1 m in front at height of 1 m
NC-50
NC-40
NC-30
NC-20
125 250
500
1000
2000
4000
8000
: SPW-KR254GH56 (A/B)
: STRONG 41 dB(A)
MEDIUM 37 dB(A)
WEAK 34 dB(A)
: 1 m in front at height of 1 m
NC-50
NC-40
NC-30
NC-20
125 250
500
1000
2000
4000
8000
MODEL
: SPW-KR184GH56 (A/B)
SOUND LEVEL
: STRONG 38 dB(A)
MEDIUM 34 dB(A)
WEAK 30 dB(A)
CONDITION
: 1 m in front at height of 1 m
60
50
40
30
Approximate
minimum
20
audible limit
for continuous
noise
10
63
125 250
Overall
Frequency at center of sound pressure band (Hz)
1-298
Both 50Hz / 60Hz
Strong
Weak
NC-50
NC-40
NC-30
NC-20
500
1000
2000
4000
8000
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