CFL-LV-F1
CIRCULAR FILM LINED
LOW VELOCITY SILENCER (<1500 FPM)
HOW TO SPECIFY:
EXAMPLE
CERTIFIED PERFORMANCE DATA
24 X CFL-LV-F1 X 72
Silencer
Duct
Connection Model
Size
Insertion Loss (IL)
+ : “forward flow” where noise & airflow move in same direction (e.g. supply side)
- : “reverse flow” where noise & airflow move in opposite directions (e.g. return side)
DC
(in.)
SL
(in.)
(ft. per min.)
FACE VEL.
12
24
0
24
48
36
72
48
96
60
120
- 1000
+ 1000
DC
(in.)
SL
(in.)
(ft. per min.)
6
12
36
0
24
72
36
108
48
144
60
180
9
14
20
30
44
49
20
6
9
12
19
27
42
49
20
10
19
35
46
40
13
9
- 1000
6
10
+ 1000
6
10
0
6
13
19
18
19
24
24
29
35
14
23
30
+ 1000
9
14
21
28
14
- 1000
10
18
+ 1000
10
0
10
47
49
40
20
13
45
40
13
38
27
10
37
39
34
37
27
27
10
10
32
35
34
21
18
26
31
32
32
21
9
20
27
32
32
29
19
9
11
20
+ 1000
11
20
11
43
27
18
- 1000
0
22
37
34
9
9
29
23
- 1000
0
DC - Duct Connection Size (inches)
SL - Silencer Length (inches)
OCTAVE BAND - Hz/D.I.L. (dB)
63 125 250 500 1000 2000 4000 8000
6
27
32
28
33
27
32
34
34
30
33
21
30
19
28
19
9
9
9
9
Silencer
Length
FACE VEL.
- 1000
+ 1000
OCTAVE BAND - Hz/D.I.L. (dB)
63 125 250 500 1000 2000 4000 8000
7
13
20
30
44
60
60
30
7
13
19
28
41
60
60
30
9
16
28
35
48
59
55
7
- 1000
9
+ 1000
0
13
16
29
9
16
11
21
- 1000
11
+ 1000
0
0
- 1000
58
55
33
41
48
55
41
32
16
27
40
0
16
+ 1000
46
42
40
49
46
60
56
54
DUCT
SILENCER SILENCER
CONNECT. OUTER
LENGTH WEIGHT
SIZE (in.) DIA. (in.)
(in.)
(lbs)
12
12
24
24
36
36
48
48
28
28
40
40
52
52
64
64
60
76
60
76
24
36
48
72
72
108
96
144
126
164
363
487
726
995
1233
1689
180
2599
120
1890
0.02
0.04
0.02
0.03
0.02
0.03
0.02
0.03
0.02
0.03
1000
1500
0.08
0.19
0.09
0.15
0.08
0.13
0.09
0.12
0.08
0.10
0.10
0.20
0.33
0.19
0.29
0.20
0.27
0.19
0.23
0.23
2000
0.36
0.59
0.33
0.51
0.36
0.48
0.33
0.42
0.33
0.40
LENGTH FACE VELOCITY
(inches) (feet per minute)
ALL
- 1500
- 1000
+ 1000
+ 1500
50
33
27
39
42
44
48
33
29
42
44
46
43
29
16
29
16
29
2500
0.57
0.92
0.52
0.80
0.57
0.74
0.52
0.65
0.52
0.63
GN correction chart at right
must be used to correct GN
to other face areas.
OCTAVE BAND - Hz/GENERATED NOISE (dB re 10 -12 watts)
63
125
250
500
1000
2000
4000
62
57
56
61
54
49
48
53
FACE AREA (sq.ft.)
Questions? 1-800-565-8401
dB
We reserve the right to improve our designs and data at any time without notice.
50
45
45
50
1.5
-3
48
43
42
47
3
0
5.155
46
41
38
43
6
+3
47
42
39
44
12
+6
44
39
37
42
24
41
48
43
41
42
45
43
3000
0.82
1.33
0.74
1.15
0.82
1.07
0.74
0.94
0.74
0.90
Pressure drops are reported in accordance with ASTM E477 methods and are based upon IDEAL flow conditions (5 diameters of straight
duct on silencer inlet and 10 on outlet). Less than ideal conditions will result in an increase in pressure drop due to System Effects.
See Silencer System Effects Data on page 4.19.
Generated Noise (GN) @ 3 sq.ft. face area
41
43
46
49
48
44
44
42
FACE VELOCITY (feet per minute) / Pressure Drop (in.w.g.)
500
55
41
See pages 4.1 - 4.25 for selection information. DIL above 50dB may be limited due to noise flanking around the silencer or along the duct walls.
If more than 50dB DIL is required, contact your local Vibro-Acoustics Representative or call 1-800-565-8401.
Pressure Drop (PD)
60
34
21
16
60
27
11
27
43
49
34
16
29
35
21
+ 1000
- 1000
19
+9
3500
1.11
1.81
1.01
1.56
1.11
1.46
1.01
1.28
33
30
19
19
19
15
15
15
14
14
14
29
13
29
13
13
:
Acceptable
(0 - 0.35”)
:
Caution (>0.35”)
Pressure Drop
may be too high
for certain
applications
1.01
1.23
8000
46
41
39
44
48
+12
Copyright © 2010 Vibro-Acoustics
CFL-LV-F1
CFL-LV-F2
CIRCULAR FILM LINED
LOW VELOCITY SILENCER (<1500 FPM)
HOW TO SPECIFY:
EXAMPLE
CERTIFIED PERFORMANCE DATA
24 X CFL-LV-F2 X 72
Silencer
Duct
Connection Model
Size
Insertion Loss (IL)
+ : “forward flow” where noise & airflow move in same direction (e.g. supply side)
- : “reverse flow” where noise & airflow move in opposite directions (e.g. return side)
DC
(in.)
SL
(in.)
12
24
24
48
36
72
48
96
60
120
FACE VEL. OCTAVE BAND - Hz/D.I.L. (dB)
125 250 500 1000 2000 4000 8000
(ft. per min.) 63
- 1000
3
6
12
20
30
44
49
20
6
11
19
27
42
49
20
16
24
35
46
40
13
0
3
6
- 1000
3
7
+ 1000
3
12
17
19
24
0
3
7
- 1000
5
10
20
30
5
10
18
28
12
23
+ 1000
0
+ 1000
- 1000
3
5
12
6
12
6
- 1000
7
0
+ 1000
7
7
15
10
6
0
+ 1000
7
19
24
22
29
37
43
47
49
40
20
13
23
34
45
40
13
29
35
38
27
10
32
32
31
37
34
35
34
32
39
37
34
33
32
27
10
21
9
21
21
9
9
13
25
33
34
30
19
9
13
23
32
30
28
19
9
13
24
32
32
29
19
SL
(in.)
12
36
24
10
27
DC
(in.)
9
72
36
108
48
144
60
180
Silencer
Length
DC - Duct Connection Size (inches)
SL - Silencer Length (inches)
FACE VEL. OCTAVE BAND - Hz/D.I.L. (dB)
125 250 500 1000 2000 4000 8000
(ft. per min.) 63
- 1000
4
9
0
4
9
- 1000
5
10
+ 1000
4
9
18
29
25
35
16
0
5
10
25
- 1000
7
14
29
+ 1000
7
+ 1000
0
- 1000
0
+ 1000
- 1000
0
+ 1000
5
10
7
14
14
9
18
30
17
28
35
55
48
60
59
DUCT
SILENCER SILENCER
CONNECT. OUTER
LENGTH WEIGHT
SIZE (in.) DIA. (in.)
(in.)
(lbs)
12
12
24
24
36
36
48
48
20
20
32
32
44
44
56
56
60
68
60
68
24
36
48
72
72
108
96
144
87
114
279
379
589
798
1026
1416
48
55
41
56
28
40
46
54
46
35
43
37
45
34
36
35
42
44
43
120
1589
44
29
13
44
42
29
13
46
180
2232
3000
3500
0.02
0.08
0.19
0.33
0.52
0.74
1.01
0.03
0.10
0.23
0.40
0.63
0.90
Pressure drops are reported in accordance with ASTM E477 methods and are based upon IDEAL flow conditions (5 diameters of straight
duct on silencer inlet and 10 on outlet). Less than ideal conditions will result in an increase in pressure drop due to System Effects.
See Silencer System Effects Data on page 4.19.
Generated Noise (GN) @ 3 sq.ft. face area
LENGTH FACE VELOCITY
(inches) (feet per minute)
ALL
- 1500
- 1000
+ 1000
+ 1500
GN correction chart at right
must be used to correct GN
to other face areas.
OCTAVE BAND - Hz/GENERATED NOISE (dB re 10 -12 watts)
63
125
250
500
1000
2000
4000
62
57
56
61
54
49
48
53
FACE AREA (sq.ft.)
Questions? 1-800-565-8401
dB
We reserve the right to improve our designs and data at any time without notice.
50
45
45
50
1.5
-3
48
43
42
47
3
0
5.156
46
41
38
43
6
+3
47
42
39
44
12
+6
44
39
37
42
24
+9
15
48
44
2500
0.82
1.33
0.74
1.15
0.82
1.07
0.74
0.94
15
14
2000
0.57
0.92
0.52
0.80
0.57
0.74
0.52
0.65
19
33
1500
0.36
0.59
0.33
0.51
0.36
0.48
0.33
0.42
19
19
49
48
1000
0.20
0.33
0.19
0.29
0.20
0.27
0.19
0.23
30
15
500
0.09
0.15
0.08
0.13
0.09
0.12
0.08
0.10
41
30
30
41
FACE VELOCITY (feet per minute) / Pressure Drop (in.w.g.)
0.02
0.04
0.02
0.03
0.02
0.03
0.02
0.03
55
41
49
50
48
43
See pages 4.1 - 4.25 for selection information. DIL above 50dB may be limited due to noise flanking around the silencer or along the duct walls.
If more than 50dB DIL is required, contact your local Vibro-Acoustics Representative or call 1-800-565-8401.
Pressure Drop (PD)
60
28
19
19
60
41
55
9
19
49
58
42
9
60
46
42
35
9
60
60
34
18
18
60
43
24
9
9
44
1.11
1.81
1.01
1.56
1.11
1.46
1.01
1.28
33
33
29
14
14
13
:
Acceptable
(0 - 0.35”)
:
Caution (>0.35”)
Pressure Drop
may be too high
for certain
applications
1.23
8000
46
41
39
44
48
+12
Copyright © 2010 Vibro-Acoustics
CFL-LV-F2