Type MKA

For increased insertion loss and broadband attenuation even in the low frequency range

Energy-saving splitters with resonating panels, ready to be used in air conditioning systems

  • Attenuation effect due to resonance and absorption
  • Energy efficient due to aerodynamically profiled frame (radius > 15 mm)
  • Acoustic data measured to ISO 7235
  • Absorption material is biosoluble and hence hygienically safe
  • Absorption material faced with glass fibre fabric as a protection against erosion due to airflow velocities up to 20 m/s
  • Absorption material non-combustible, to EN 13501, fire rating class A1
  • Intermediate sizes in increments of 1 mm
  • Operating temperature up to 100 °C


Optional equipment and accessories

  • Additional perforated sheet metal to protect the absorption material
  • Stainless steel, aluminium and PUR-coated constructions upon request

Sound attenuator splitter, variant MKA200 00131689_0


  • Application
  • Description

Application

  • Sound attenuator splitters with resonating panels, Type MKA, used for the reduction of fan noise and air-regenerated noise in air conditioning systems
  • Attenuation effect due to absorption and resonance
  • Broadband attenuation even in the low frequency range of critical fan noise
  • Hygiene tested and certified to VDI 6022
  • For use in potentially explosive atmospheres (ATEX), zones 1, 2, 21 and 22 (outside)

Special characteristics

  • Resonating panels ensure increased insertion loss in the frequency range of critical fan noise
  • Up to 30 % lower differential pressure
  • Energy efficient and/or space saving due to aerodynamically profiled frame
  • Hygiene tested and certified
  • Multi-section construction available for large dimensions

Nominal sizes

  • H: 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800 mm (intermediate sizes 150 – 2500 mm in increments of 1 mm)
  • Height subdivided: 2501 – 5000 mm, in increments of 1 mm
  • L: 500, 750, 1000, 1250, 1500 mm (intermediate sizes 501 – 2500 mm in increments of 1 mm)
  • Length subdivided: 2501 – 3000 mm in increments of 1 mm
  • Undivided construction: H + L 4000 mm max., H and L 1500 mm max. (if one dimension is 1500 mm, the other one must not exceed 1500 mm)

Variants

  • MKA100: splitter thickness 100 mm
  • MKA200: splitter thickness 200 mm
  • MKA230: splitter thickness 230 mm

Construction

Surface of splitter area not covered by a resonating panel

  • F: Glass fibre fabric
  • L: Glass fibre fabric and additional perforated sheet metal to protect the absorption material

Parts and characteristics

  • Aerodynamically profiled frame
  • Absorption material and resonating panels fitted to reduce air-regenerated noise by absorption and resonance

Useful additions

  • U-sheets/clamp sheets to join subdivided attenuator splitters

Construction features

  • Aerodynamically profiled splitter frame (radius > 15 mm) that enables a reduction of turbulence both upstream and downstream; frame with grooves for increased rigidity
  • Frame edges are folded to protect the infill
  • Operating temperature up to 100 °C (construction with perforated sheet metal up to 300 °C for 8h max.)

Materials and surfaces

  • Splitter frames, centre mullion and resonating panels made of galvanised sheet steel
  • Absorption material is mineral wool


Mineral wool

  • To EN 13501, fire rating class A1, non-combustible
  • RAL quality mark RAL-GZ 388
  • Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EC
  • Faced with glass fibre fabric as a protection against erosion through airflow velocities of up to 20 m/s
  • Inert to fungal and bacterial growth

Standards and guidelines

  • Insertion loss and sound power level of air-regenerated noise tested to ISO 7235
  • Meets the hygiene requirements of VDI 6022, DIN 1946, parts 1 and 2 as well as of VDI 3803
  • Directive 94/9/EC: Equipment and protective systems intended for use in potentially explosive atmospheres

Maintenance

  • Maintenance-free as construction and materials are not subject to wear

Technical information

Function, Technical data, Quick sizing, Specification text, Order code, Related products

  • Function
  • Technical data
  • Quick sizing
  • Specification text
  • Order code

Functional description

The attenuation effect of the MKA splitters is due to absorption and resonance.

The splitters have a mineral wool infill as absorption material. Part of the splitter surface that runs parallel to the airflow is covered with resonating panels. These panels start oscillating due to the sound (resonance) and hence absorb sound energy. Resonance works best in the frequency range of critical fan noise.

There is a higher attenuation across a wider frequency range when compared to mere absorption splitters.

Splitter thickness

100, 200, 230 mm

Nominal sizes

150 × 500 mm – 1499 × 2500, 2500 × 1499 or 1500 × 1500 mm

Height subdivided

2501 – 5000 mm

Length subdivided

1501 – 3000 mm

Intermediate sizes

In increments of 1 mm

Operating temperature

Up to 100 °C

The length (L) of sound attenuator splitters refers to the airflow direction


Quick sizing tables provide a good overview of the insertion loss and of differential pressures for different airway widths and airflow velocities. Intermediate values can be calculated with our Easy Product Finder design programme.

The sound power levels LWA apply to sound attenuators with a cross-sectional area (B × H) of 1 m².

The differential pressures apply to sound attenuators with a height of 1 m.

MSA, MKA, XSA, XKA, RKA, air-regenerated noise

vs

m/s

4

6

8

10

12

14

16

18

20

LWA

dB(A)

21

31

38

43

48

51

55

58

60


MKA100, MSA100, insertion loss and differential pressure

L S Centre frequency fm [Hz] vs [m/s]
L S 63 125 250 500 1000 2000 4000 8000 4 10 20
L S De Δpst
mm mm Hz Pa

500

40

4

10

11

13

21

27

24

18

5

32

>80

1000

40

5

13

20

23

31

38

32

26

7

44

>80

1000

60

5

11

17

19

28

32

27

21

5

33

>80

1500

40

6

16

30

32

42

48

40

34

9

55

>80

1500

60

6

14

25

28

38

41

33

27

6

38

>80

1500

100

4

10

14

19

29

28

19

14

5

29

>80

2000

40

8

19

39

42

53

58

49

42

11

66

>80

2000

60

7

16

32

36

47

50

40

34

7

44

>80

2000

100

5

12

19

25

37

35

23

16

5

32

>80

2000

200

3

9

10

17

25

15

9

8

4

25

>80

2500

40

9

22

48

52

63

68

57

51

12

77

>80

2500

60

8

19

40

45

57

59

47

40

8

50

>80

2500

100

6

14

24

30

45

41

27

19

6

34

>80

2500

200

3

12

12

21

33

19

12

11

4

26

>80

3000

40

10

25

58

62

74

78

65

59

14

>80

>80

3000

60

9

22

48

53

67

68

54

46

9

56

>80

3000

100

7

16

28

36

53

47

31

22

6

37

>80

3000

200

2

14

15

26

41

24

16

14

4

27

>80


MKA200, MSA200, insertion loss and differential pressure

L S Centre frequency fm [Hz] vs [m/s]
L S 63 125 250 500 1000 2000 4000 8000 4 10 20
L S De Δpst
mm mm Hz Pa

500

50

5

7

19

21

26

22

17

14

9

58

>80

500

100

2

4

12

12

15

11

9

8

5

31

>80

1000

50

6

16

33

39

41

39

26

20

11

67

>80

1000

100

4

10

22

23

26

19

13

11

6

35

>80

1000

200

2

7

13

12

12

10

8

6

3

21

>80

1500

50

9

22

44

53

56

54

34

25

12

75

>80

1500

100

5

15

32

33

37

25

16

14

6

40

>80

1500

200

3

9

19

18

15

12

10

7

4

23

>80

1500

400

1

6

10

8

8

6

4

4

2

15

61

2000

50

12

29

55

67

72

70

43

29

13

>80

>80

2000

100

6

19

42

44

47

31

19

17

7

44

>80

2000

200

4

12

25

23

18

15

12

9

4

25

>80

2000

400

1

8

13

10

10

8

5

5

3

17

67

2500

50

14

38

61

72

78

79

49

35

15

>80

>80

2500

100

8

25

50

54

58

38

23

18

8

48

>80

2500

200

5

16

30

29

23

16

13

10

4

28

>80

2500

400

2

10

16

13

12

9

6

5

3

18

72

3000

50

17

48

67

77

84

88

56

40

16

>80

>80

3000

100

10

30

58

64

69

44

26

19

8

53

>80

3000

200

6

19

35

35

27

17

15

11

5

30

>80

3000

400

3

13

19

15

14

10

7

6

3

19

77


MKA230, MSA230, insertion loss and differential pressure

L S Centre frequency fm [Hz] vs [m/s]
L S 63 125 250 500 1000 2000 4000 8000 4 10 20
L S De Δpst
mm mm Hz Pa

500

60

3

7

16

19

21

17

14

14

9

57

>80

500

115

2

5

11

12

13

10

9

10

5

31

>80

1000

60

7

13

27

30

35

25

18

18

10

66

>80

1000

115

4

10

20

20

22

15

12

13

6

35

>80

1000

230

1

7

12

10

8

4

6

8

3

20

>80

1500

60

11

19

38

41

49

33

21

21

12

74

>80

1500

115

7

14

28

28

30

20

15

15

6

40

>80

1500

230

2

10

18

15

10

6

9

9

4

23

>80

2000

60

15

24

50

50

50

42

25

25

13

>80

>80

2000

115

9

19

37

36

39

26

18

18

7

44

>80

2000

230

3

13

24

19

13

8

11

10

4

25

>80

2000

460

0

7

10

3

0

0

3

3

3

16

64

2500

60

19

30

50

50

50

50

29

28

15

>80

>80

2500

115

12

24

46

44

47

31

21

20

8

48

>80

2500

230

4

16

29

24

16

11

13

12

4

27

>80

2500

460

0

9

13

4

0

0

5

3

3

17

69

3000

60

24

36

50

50

50

50

32

32

16

>80

>80

3000

115

14

28

50

50

50

36

24

23

8

52

>80

3000

230

4

19

35

29

18

13

15

13

5

29

>80

3000

460

0

11

16

6

0

0

7

3

3

19

74


Sound attenuator splitters used for the reduction of fan noise and air-regenerated noise in air conditioning systems. Attenuation effect due to absorption and resonance. Energy-saving as well as hygiene tested and certified.

Installation kit consists of an aerodynamically profiled frame (radius > 15 mm), absorption material and resonating panels.

Frame edges are folded to protect the sound absorbing infill.

Insertion loss and sound power level of the air-regenerated noise tested to ISO 7235.

Meets the hygiene requirements of VDI 6022, DIN 1946, parts 2 and 4, as well as of VDI 3803.

Special characteristics

  • Resonating panels ensure increased insertion loss in the frequency range of critical fan noise
  • Up to 30 % lower differential pressure
  • Energy efficient and/or space saving due to aerodynamically profiled frame
  • Hygiene tested and certified
  • Multi-section construction available for large dimensions

Materials and surfaces

  • Splitter frames, centre mullion and resonating panels made of galvanised sheet steel
  • Absorption material is mineral wool


Mineral wool

  • To EN 13501, fire rating class A1, non-combustible
  • RAL quality mark RAL-GZ 388
  • Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EC
  • Faced with glass fibre fabric as a protection against erosion through airflow velocities of up to 20 m/s
  • Inert to fungal and bacterial growth

Construction

Surface of splitter area not covered by a resonating panel

  • F: Glass fibre fabric
  • L: Glass fibre fabric and additional perforated sheet metal to protect the absorption material

Technical data

  • Splitter thickness: 100, 200, 230 mm
  • Nominal sizes: 150 × 500 mm – 1499 × 2500, 2500 × 1499 or 1500 × 1500 mm
  • Height subdivided: up to 5000 mm
  • Length subdivided: up to 3000 mm
  • Intermediate sizes: in increments of 1 mm
  • Operating temperature: up to 100 °C


The length (L) of splitter attenuators refers to the airflow direction.

Sizing data

  • B _______________________ [mm]
  • H _______________________ [mm]
  • L (in airflow direction) __________ [mm]
  • V _______________________ [m³/h]
  • De at 250 Hz ________________ [dB]
  • Δpst _______________________ [Pa]

This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme.

The length (L) of sound attenuator splitters and splitter attenuators refers to the airflow direction. Remember this with regard to vertical ducting.

Order example: MKA100–L/1500×1500

Splitter thickness

100 mm

Splitter surface

Glass fibre fabric and perforated sheet metal

Height

1500 mm

Length

1500 mm


 

Dimensions and weight

  • Dimensions and weight
MKA 00104150_0.


  • H: 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800 mm (intermediate sizes 150 – 2500 mm in increments of 1 mm)
  • Height subdivided: 2501 – 5000 mm, in increments of 1 mm
  • L: 500, 750, 1000, 1250, 1500 mm (intermediate sizes 501 – 2500 mm in increments of 1 mm)
  • Length subdivided: 2501 – 3000 mm in increments of 1 mm
  • Undivided construction: H + L 4000 mm max., H and L 1500 mm max. (if one dimension is 1500 mm, the other one must not exceed 1500 mm)

The total weight of a splitter sound attenuator is the combined weight of the casing (with standard flange or angle section frame) and all splitters.

The total weight for intermediate sizes can be generated with our Easy Product Finder design programme.

MKA100, weights

H Glass fibre fabric (-F) Glass fibre fabric and perforated sheet metal (-L)
H L [mm]
H 500 750 1000 1250 1500 500 750 1000 1250 1500
mm kg

300

2

3

4

5

6

3

4

5

6

8

600

4

5

7

8

10

5

7

9

11

13

900

5

7

9

11

13

7

10

13

16

18

1200

7

10

12

15

17

9

13

16

20

24

1500

8

12

15

18

21

11

16

20

25

29

1800

10

14

19

23

27

14

19

25

31

36


MKA200, weights

H Glass fibre fabric (-F) Glass fibre fabric and perforated sheet metal (-L)
H L [mm]
H 500 750 1000 1250 1500 500 750 1000 1250 1500
mm kg

300

4

5

6

7.5

9

4

6

7

9

11

600

6

8

10

12

15

7

10

12

15

18

900

8

11

14

17

20

10

14

17

21

25

1200

10

14

18

22

26

13

18

22

27

32

1500

13

17

22

27

31

15

21

27

33

40

1800

16

22

28

34

40

19

27

34

42

50


MKA230, weights

H Glass fibre fabric (-F) Glass fibre fabric and perforated sheet metal (-L)
H L [mm]
H 500 750 1000 1250 1500 500 750 1000 1250 1500
mm kg

300

4

5

7

8

10

5

6

8

10

12

600

6

9

11

14

16

8

11

13

16

19

900

9

12

16

19

22

11

15

19

23

27

1200

11

16

20

24

28

14

19

24

30

35

1500

14

19

24

29

34

17

23

30

36

43

1800

18

24

31

37

44

21

29

37

45

54


Installation details, Basic information and nomenclature

  • Installation details
  • Basic information and nomenclature

Installation and commissioning

  • Splitters are supplied as ready-to-install kits
  • Follow the installation information and comply with the general codes of good practice in order to achieve the given performance data
  • Up to height H = 1200 mm: any installation orientation, but we recommend upright installation of splitters
  • From height H = 1201 mm: upright installation only
  • The length (L) of sound attenuator splitters and splitter sound attenuators refers to the airflow direction; be sure to note how width, height and length are defined, particularly in case of a vertical airflow
  • Installation in ducts outside of closed rooms requires sufficient protection against the effects of weather

Principal dimensions

ØD [mm]

Outer diameter of the spigot

ØD₃ [mm]

Outer diameter of circular silencers

L [mm]

Length of attenuator/silencer including spigot (in airflow direction)

L₁ [mm]

Length of acoustic cladding and acoustically effective length

B [mm]

Attenuator width and duct width (upright splitters)

H [mm]

Attenuator height and duct height (upright splitters)

T [mm]

Splitter thickness

S [mm]

Airway width

n [ ]

Number of flange screw holes

m [kg]

Weight

Nomenclature

fm [Hz]

Octave band centre frequency

LWA [dB(A)]

A-weighted sound power level of air-regenerated noise

De [dB]

Insertion loss

V [m³/h] and [l/s]

Volume flow rate

Δpst [Pa]

Static differential pressure


All sound power levels are based on 1 pW.


All values were measured in a TROX lab and to EN ISO 7235. Intermediate values may be achieved by interpolation.


Lab measurements exceeding 50 dB are indicated as 50 dB, in line with common practice.

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Visual contact Visual contact

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Our department for Service-Requests will contact you asap.
For general question regarding products or services you can also call:
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