DZ

Sound attenuator

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DZ

Description

The sound attenuator is used to reduce the noise in industrial and civil conditioning and ventilation systems. It is installed in square and rectangular ducts and fans.

Construction

The silencer is made of an external casing with 20 mm or 30 mm flanges and acoustic panels type K1, K2 or K3 with air guidance. Acoustic panels are filled with mineral wool. Exposed surface of mineral wool is protected with black glass voile cover. Standard insulation thickness is 100 or 200 mm.

Properties of mineral wool:

  • Thermal conductivity λ (as per SIST EN 12667): 0,035 W/mK
  • Resistance to air flow AF: ≥ 10 kPa·s/m

Acoustic panel types:

  • STANDARD: K1 – exposed surface of mineral wool is protected with black glass voile cover
  • K2 - exposed surface of mineral wool is protected with black glass voile cover and partly covered with galvanized sheet steel strips
  • K3 - exposed surface of mineral wool is protected with black glass voile cover and perforated sheet metal to protect the absorption material up to a temperature of 300˚C for up to 3 h

Material

galvanized sheet metal, mineral wool

Installation

With flange.

Dimensions

Sound Attenuator

Acoustic Panels

Dimensions A, B and L are custom.

Tables for determining sound attenuation capacity

K1-200

K1-100 L=500 mm

Frequency (Hz) Distance between acoustic panels (mm)
40 60 100 200
63 2 3 3 0
125 4 4 3 1
250 9 8 5 3
500 15 13 11 8
1000 30 25 20 15
2000 43 36 23 10
4000 33 24 13 5
8000 25 18 8 6

K1-100 L=1000 mm

Frequency (Hz) Distance between acoustic panels (mm)
40 60 100 200
63 5 4 3 1
125 8 7 4 3
250 18 14 8 5
500 29 24 18 12
1000 43 40 34 21
2000 48 45 35 14
4000 38 33 22 8
8000 30 23 14 7

K1-100 L=1500 mm

Frequency (Hz) Distance between acoustic panels (mm)
40 60 100 200
63 6 6 4 2
125 10 8 5 3
250 26 22 13 7
500 39 33 26 17
1000 49 49 43 30
2000 50 50 45 19
4000 47 42 32 10
8000 39 34 20 8

K1-100 L=2000 mm

Frequency (Hz) Distance between acoustic panels (mm)
40 60 100 200
63 8 7 5 3
125 13 11 6 5
250 35 29 18 11
500 48 43 34 23
1000 50 50 50 38
2000 50 50 50 25
4000 50 50 42 13
8000 47 40 26 10

K1-100 L=2500 mm

Frequency (Hz) Distance between acoustic panels (mm)
40 60 100 200
63 9 8 6 4
125 15 14 8 5
250 40 35 20 13
500 50 45 39 28
1000 50 50 48 46
2000 50 50 50 30
4000 50 50 48 16
8000 49 47 31 12

K1-100 L=3000 mm

Frequency (Hz) Distance between acoustic panels (mm)
40 60 100 200
63 12 9 8 5
125 21 17 9 6
250 48 42 26 15
500 50 50 40 33
1000 50 50 48 50
2000 50 50 50 34
4000 50 50 50 20
8000 50 48 35 13

K1-200

K1-200 L=500 mm

Frequency (Hz) Distance between acoustic panels (mm)
60 80 100 200
63 4 3 3 2
125 5 5 4 2
250 11 10 9 6
500 20 19 18 12
1000 28 25 24 14
2000 26 24 22 11
4000 18 16 15 7
8000 12 11 10 5

K1-200 L=1000 mm

Frequency (Hz) Distance between acoustic panels (mm)
60 80 100 200
63 5 4 3 2
125 10 9 8 5
250 19 18 15 11
500 33 30 30 21
1000 48 45 40 24
2000 39 35 37 17
4000 28 26 23 11
8000 18 16 15 7

K1-200 L=1500 mm

Frequency (Hz) Distance between acoustic panels (mm)
60 80 100 200
63 7 6 6 3
125 15 12 11 6
250 25 26 23 15
500 45 41 38 29
1000 50 49 43 34
2000 50 48 42 24
4000 48 33 28 13
8000 24 19 18 9

K1-200 L=2000 mm

Frequency (Hz) Distance between acoustic panels (mm)
60 80 100 200
63 9 8 7 4
125 15 14 13 9
250 38 34 28 20
500 50 50 50 41
1000 50 50 50 45
2000 50 50 50 32
4000 38 37 36 18
8000 26 24 22 11

K1-200 L=2500 mm

Frequency (Hz) Distance between acoustic panels (mm)
60 80 100 200
63 10 9 8 4
125 19 17 15 11
250 42 40 37 22
500 50 50 50 48
1000 50 50 50 48
2000 50 50 49 40
4000 45 43 38 22
8000 30 27 23 12

K1-200 L=3000 mm

Frequency (Hz) Distance between acoustic panels (mm)
60 80 100 200
63 12 11 10 4
125 21 19 17 11
250 48 45 42 26
500 50 50 50 49
1000 50 50 50 50
2000 50 50 49 46
4000 50 50 45 23
8000 34 28 25 13