Sound Levels; Noise Levels(Vml-E); Nc Curves(Vml-E); Fan Characteristics Curves(Vml-E) - Mitsubishi Electric PEFY-P-VML-E Data Book

2. Sound Levels

2-1. Noise levels(VML-E)

➀ Rear inlet model1
Aux.duct
1m

2-2. NC curves(VML-E)

PEFY-P20,25VML-E
External static pressure : 5Pa
Power source : 220·230·240(V)
70
60
50
40
30
20
10
Approximate minimum Approximate minimum
audible limit on audible limit on
continuous noise continuous noise
0
63 125
OCTAVE BAND CENTER FREQUENCIES (Hz)

2-3. Fan characteristics curves(VML-E)

PEFY-P20,25VML-E
Power source : 220·230·240(V)
18
16
14
12
10
8
6
Low
4
2
0
4 5
2m
Measurement location
High speed
Middle speed
Low speed
NC60
NC50
NC40
NC30
NC20
250 500 1000 2000 4000 8000
50Hz
60Hz
High
Middle
6 7 8 9
Airflow rate (m 3 /min)
Noise level at anechoic room (Low-Mid-High)
Model
PEFY-P20VML-E
PEFY-P25VML-E
PEFY-P32VML-E
PEFY-P32VML-E
External static pressure : 5Pa
Power source : 220·230·240(V)
70
60
50
40
30
20
10
Approximate minimum Approximate minimum
audible limit on audible limit on
continuous noise continuous noise
0
63 125 250
OCTAVE BAND CENTER FREQUENCIES (Hz)
PEFY-P32VML-E
Power source : 220·230·240(V)
12
50Hz
60Hz
10
8
6
4
Middle
2
Low
0
4 5
1- 8
Unit : dB(A)
Noise level (A weighted)
25-29-36
25-29-40
High speed
Middle speed
Low speed
NC60
NC50
NC40
NC30
NC20
500 1000 2000 4000 8000
High
6 7 8 9 10
Airflow rate (m /min)
3