1
1-298
1-8. Noise Criterion Curves
Wall-Mounted Type
NC-20
NC-30
NC-40
NC-50
400063 125 250 800020001000500
60
50
40
30
20
10
NC-20
NC-30
NC-40
NC-50
400063 125 250 800020001000500
60
50
40
30
20
10
NC-20
NC-30
NC-40
NC-50
400063 125 250 800020001000500
60
50
40
30
20
10
MODEL
SOUND LEVEL
CONDITION
: 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
Sound pressure level (dB)
(0dB = 0.0002μbar)
Approximate
minimum
audible limit
for continuous
noise
Overall
Frequency at center of sound pressure band (Hz)
Both 50Hz / 60Hz
Strong
Weak
MODEL
SOUND LEVEL
CONDITION
: SPW-KR184GH56 (A/B)
: STRONG 38 dB(A)
MEDIUM 34 dB(A)
WEAK 30 dB(A)
: 1 m in front at height of 1 m
Sound pressure level (dB)
(0dB = 0.0002μbar)
Overall
Frequency at center of sound pressure band (Hz)
MODEL
SOUND LEVEL
CONDITION
: 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
Sound pressure level (dB)
(0dB = 0.0002μbar)
Overall
Frequency at center of sound pressure band (Hz)
Approximate
minimum
audible limit
for continuous
noise
Approximate
minimum
audible limit
for continuous
noise
SM830160-03ClassicPAC-iA4.ind298298SM830160-03ClassicPAC-iA4.ind298298 2010/02/1610:26:432010/02/1610:26:43