LD 4 Silencer

Item Number: 411282

Easily-fitted silencer for circular ducts,fitted with a connection which is compatible with a standard spiral duct. The LD effectively reduces noise in the duct. Two silencers can be used together in installations where noise reduction is critical. For the most effective noise reduction, the silencer should be fitted immediately behind a fan or bend.

• Insulation thickness 2 inches
• Made of galvanized steel

Technical parameters

Dimensions and weights
Duct dimension; Circular, inlet 4 in.
Duct dimension; Circular, outlet 4 in.
Weight 11.4 lb
Optional
Duct connection type Circular
Noise suppression dB (mid-frequency Hz)

63 Hz

125 Hz

250 Hz

500 Hz

1k Hz

2k Hz

4k Hz

8k Hz

LD 4

4

3

11

24

36

49

34

17

LD 5

3

3

9

23

30

40

22

14

LD 6

-

3

7

20

27

31

16

11

LD 8

2

3

7

16

21

23

9

8

LD 10

3

4

8

20

26

23

10

8

LD 12

1

3

7

16

22

12

6

7

LD 14

-

3

6

13

18

10

6

7

LD 16

1

3

5

10

13

7

5

6

LD 20

4

8

13

18

24

28

17

16

Model ø Dia.† Outside ø l (Length)

LD 4

4

8

23 5/8

LD 5

5

9

23 5/8

LD 6

6

10 1/4

23 5/8

LD 8

8

12 1/2

23 5/8

LD 10

10

14

35 1/2

LD 12

12

17 3/4

35 1/2

LD 16

16

25

35 1/2

Dimensions in inches