Mitsubishi Electric City Multi PLFY Series Technical & Service Manual page 13

3-4. NOISE CRITERION CURVES
PLFY-WL10VFM-E.TH
FAN SPL(dB)
High 27
Medium 26
Low 25
90
80
70
60
50
40
30
20
Approximate minimum
audible limit on
continuous noise
10
63 125 250 500 1000 2000
BAND CENTER FREQUENCIES, Hz
PLFY-WL20VFM-E.TH
FAN SPL(dB)
High 31
Medium 29
Low 27
90
80
70
60
50
40
30
20
Approximate minimum
audible limit on
continuous noise
10
63 125 250 500 1000 2000
BAND CENTER FREQUENCIES, Hz
OCH717
PLFY-WL15VFM-E.TH
LINE
90
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
Approximate minimum
NC-20
audible limit on
continuous noise
10
4000 8000
63 125 250
BAND CENTER FREQUENCIES, Hz
PLFY-WL25VFM-E.TH
LINE
90
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
Approximate minimum
audible limit on
NC-20
continuous noise
10
4000 8000 63 125
BAND CENTER FREQUENCIES, Hz
FAN SPL(dB) LINE
High 29
Medium 26
Low 25
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
500 1000 2000 4000 8000
SPL(dB)
FAN LINE
High 34
Medium 30
27
Low
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
250 500 1000 2000 4000 8000
13
PLFY-WL32VFM-E.TH
FAN SPL(dB)
High 41
Medium 33
Low 27
90
80
70
60
50
40
30
20
Approximate minimum
audible limit on
continuous noise
10
63 125 250 500 1000 2000
BAND CENTER FREQUENCIES, Hz
LINE
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
4000 8000