7
6
TCH122
4
NOISE CRITERION CURVES
NOISE CRITERION CURVES
10
20
30
40
50
60
70
80
90
63 125 250 500 1000 2000 4000 8000
OCTAVE BAND SOUND PRESSURE LEVEL, dB(0dB=0.0002μbar)
BAND CENTER FREQUENCIES, Hz
Approximate minimum
audible limit on
continuous noise
PKFY-WL04NLMU-E.TH
NC-60
NC-50
NC-40
NC-20
NC-30
NC-70
High
FAN
Medium1
30
SPL(dB)
28
26
22
LINE
Medium2
Low
10
20
30
40
50
60
70
80
90
63 125 250 500 1000 2000 4000 8000
Approximate minimum
audible limit on
continuous noise
PKFY-WL06NLMU-E.TH
NC-60
NC-50
NC-40
NC-20
NC-30
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB(0dB=0.0002μbar)
BAND CENTER FREQUENCIES, Hz
High
FAN
Medium1
36
SPL(dB)
33
28
22
LINE
Medium2
Low
10
20
30
40
50
60
70
80
90
63 125 250 500 1000 2000 4000 8000
Approximate minimum
audible limit on
continuous noise
PKFY-WL08NLMU-E.TH
NC-60
NC-50
NC-40
NC-20
NC-30
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB(0dB=0.0002μbar)
BAND CENTER FREQUENCIES, Hz
High
FAN
Medium1
41
SPL(dB)
36
30
22
LINE
Medium2
Low
10
20
30
40
50
60
70
80
90
63 125 250 500 1000 2000 4000 8000
OCTAVE BAND SOUND PRESSURE LEVEL, dB(0dB=0.0002μbar)
BAND CENTER FREQUENCIES, Hz
High
FAN
Medium1
41
SPL(dB)
38
34
29
LINE
Medium2
Low
Approximate minimum
audible limit on
continuous noise
PKFY-WL12NLMU-E.TH
NC-60
NC-50
NC-40
NC-20
NC-30
NC-70