CD-LV-F1
CIRCULAR DISSIPATIVE
LOW VELOCITY SILENCER (<1500 FPM)
HOW TO SPECIFY:
EXAMPLE
SILENCER SHEETS
24 X CD-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.)
7
12
36
0
24
72
36
108
48
144
60
180
11
18
28
39
44
43
31
7
11
16
26
35
42
43
31
33
45
46
11
17
27
37
- 1000
7
12
25
34
+ 1000
7
12
23
32
43
10
17
29
40
45
0
7
- 1000
10
+ 1000
10
0
12
24
17
30
17
28
21
15
46
43
44
39
13
23
36
23
24
37
0
13
38
43
33
+ 1000
20
44
21
23
35
35
12
13
45
37
+ 1000
- 1000
20
43
36
35
45
43
45
31
35
39
21
12
43
47
39
12
41
47
43
47
- 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
7
35
24
15
19
14
34
19
41
32
19
41
29
17
30
28
15
24
45
33
20
14
14
17
13
17
13
13
Silencer
Length
FACE VEL.
- 1000
+ 1000
OCTAVE BAND - Hz/D.I.L. (dB)
63 125 250 500 1000 2000 4000 8000
8
15
26
8
15
24
8
15
25
41
40
39
57
60
60
46
53
60
60
46
55
60
DUCT
SILENCER SILENCER
CONNECT. OUTER
LENGTH WEIGHT
SIZE (in.) DIA. (in.)
(in.)
(lbs)
12
12
24
24
36
36
48
48
60
28
28
40
40
52
52
64
64
76
24
36
48
72
72
108
96
144
126
164
363
487
726
995
1233
1689
10
18
38
49
60
60
49
29
+ 1000
10
18
36
47
59
58
49
29
13
24
0
10
- 1000
13
+ 1000
13
0
18
37
48
60
56
36
23
24
41
56
59
54
36
23
52
59
59
49
29
57
53
+ 1000
18
32
51
58
54
60
32
- 1000
18
33
55
+ 1000
18
33
53
18
33
120
1890
500
1000
1500
2000
2500
3000
0.02
0.08
0.19
0.33
0.52
0.74
0.09
0.15
0.08
0.13
0.09
0.12
0.08
0.10
0.20
0.33
0.19
0.29
0.20
0.27
0.19
0.23
0.36
0.59
0.33
0.51
0.36
0.48
0.33
0.42
0.57
0.92
0.52
0.80
0.57
0.74
0.52
0.65
0.82
1.33
0.74
1.15
0.82
1.07
0.74
0.94
60
76
180
2599
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
59
54
53
58
52
47
46
51
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.
44
39
39
44
1.5
-3
43
38
37
42
3
0
5.143
45
40
37
42
6
+3
47
42
39
44
12
+6
44
39
37
42
24
+9
29
58
43
32
0
49
44
18
18
59
24
- 1000
0
60
60
60
60
57
55
50
43
26
44
60
57
42
3500
1.11
1.81
1.01
1.56
1.11
1.46
1.01
1.28
29
29
60
59
36
48
60
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
46
- 1000
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
23
21
21
21
26
20
26
20
20
:
Acceptable
(0 - 0.35”)
:
Caution (>0.35”)
Pressure Drop
may be too high
for certain
applications
1.01
1.23
8000
42
37
35
40
48
+12
Copyright © 2010 Vibro-Acoustics
CD-LV-F1
CD-LV-F2
CIRCULAR DISSIPATIVE
LOW VELOCITY SILENCER (<1500 FPM)
HOW TO SPECIFY:
EXAMPLE
SILENCER SHEETS
24 X CD-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
4
7
+ 1000
4
7
0
- 1000
0
+ 1000
- 1000
0
+ 1000
- 1000
0
+ 1000
4
4
4
4
16
28
39
44
43
31
14
26
35
42
43
31
33
45
7
15
8
22
34
20
32
43
25
40
45
8
21
8
6
11
26
6
11
24
7
14
6
7
7
11
14
31
14
27
41
39
45
30
44
29
43
37
47
47
43
45
43
41
43
35
20
45
35
20
38
24
15
39
37
+ 1000
8
15
30
44
39
28
41
14
17
30
45
19
29
43
15
15
19
46
20
24
32
33
32
31
24
19
15
15
35
34
8
8
31
47
46
- 1000
0
43
17
13
12
36
24
72
108
48
14
13
SL
(in.)
36
14
17
DC
(in.)
13
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
5
+ 1000
5
0
- 1000
5
10
10
10
6
12
23
22
41
40
60
46
60
59
49
29
33
49
48
- 1000
8
16
38
58
8
16
- 1000
11
21
+ 1000
8
16
0
11
21
- 1000
11
22
+ 1000
0
+ 1000
11
21
11
22
11
22
31
37
36
46
45
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
120
1589
180
2232
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
2500
49
29
57
60
55
36
23
60
60
50
29
56
59
56
54
59
59
60
60
44
57
42
47
60
0.57
0.92
0.52
0.80
0.57
0.74
0.52
0.65
0.52
0.63
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
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
59
54
53
58
52
47
46
51
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.
44
39
39
44
1.5
-3
43
38
37
42
3
0
5.144
45
40
37
44
6
+3
47
42
39
42
12
+6
44
39
37
42
24
+9
29
58
60
60
57
59
FACE VELOCITY (feet per minute) / Pressure Drop (in.w.g.)
500
49
59
58
46
60
47
44
48
60
49
3500
1.11
1.81
1.01
1.56
1.11
1.46
1.01
1.28
36
36
29
48
29
43
26
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)
46
60
32
0
46
60
53
12
12
60
60
39
6
6
60
21
0
+ 1000
57
55
23
23
21
21
21
26
20
26
20
20
:
Acceptable
(0 - 0.35”)
:
Caution (>0.35”)
Pressure Drop
may be too high
for certain
applications
1.01
1.23
8000
42
37
35
40
48
+12
Copyright © 2010 Vibro-Acoustics
CD-LV-F2