Type RKA

Parts kit for high insertion loss in the low-frequency range

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

  • Installation in combination with other attenuator splitters
  • 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

  • Stainless steel and powder-coated constructions upon request

Sound attenuator splitter, variant RKA200 00137286_0


  • Application
  • Description

Application

  • Sound attenuator splitters with resonating panels, Type RKA, used for the reduction of fan noise and air-regenerated noise in air conditioning systems
  • Installation in combination with other Type MKA or XKA splitters
  • Attenuation effect due to resonance
  • Broadband attenuation particularly 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 – 1499 mm in increments of 1 mm)
  • Length subdivided: 2501 – 3000 mm in increments of 1 mm
  • Undivided construction: H + L 4000 mm max., 80 kg max.

Variants

Maximum attenuation

  • A: 250 – 125 Hz
  • B: 125 – 250 Hz
  • C: 125 – 63 Hz
  • D: 63 – 125 Hz

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 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
Schematic illustration of RKA200 00104327_0.
① Splitter frame
② Absorption material
③ Resonating panels on both sides


Functional description

The attenuation effect of the RKA splitters is due to resonance.

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. The splitters have a mineral wool infill that prevents an amplification of the sound.

Splitter thickness

200 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


RKA200-A, additional insertion loss

L S Centre frequency fm [Hz]
L S 63 125 250
L S De, add
mm mm Hz

500

50

5

12

4

500

100

2

6

2

1000

50

10

25

9

1000

100

5

13

5

1500

50

14

38

14

1500

100

7

19

6


RKA200-B, additional insertion loss

L S Centre frequency fm [Hz]
L S 63 125 250
L S De, add
mm mm Hz

500

50

6

8

1

500

100

3

4

1

1000

50

12

19

5

1000

100

6

9

3

1500

50

18

28

8

1500

100

9

14

4


RKA200-C, additional insertion loss

L S Centre frequency fm [Hz]
L S 63 125 250
L S De, add
mm mm Hz

500

50

7

7

2

500

100

3

3

1

1000

50

14

15

4

1000

100

7

7

2

1500

50

21

22

6

1500

100

10

11

3


RKA200-D, additional insertion loss

L S Centre frequency fm [Hz]
L S 63 125 250
L S De, add
mm mm Hz

500

50

8

6

2

500

100

4

3

1

1000

50

16

12

4

1000

100

8

6

2

1500

50

24

19

5

1500

100

12

9

3


MKA200/XKA200 + RKA200 differential pressure

Ltot S vs [m/s]
Ltot S 4 10 20
Ltot S Δpst
mm mm Pa

1000

50

11

67

>80

1000

100

6

35

>80

1500

50

12

75

>80

1500

100

6

40

>80

2000

50

13

>80

>80

2000

100

7

44

>80

2500

50

15

>80

>80

2500

100

8

48

>80

3000

50

16

>80

>80

3000

100

8

53

>80


Sound attenuator splitters used for the reduction of fan noise and air-regenerated noise in air conditioning systems. Attenuation effect due to resonance. To be used in combination with sound absorbing splitters. 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 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

Technical data

  • Splitter thickness: 200 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: RKA200–B/1500×1000

Resonator construction

125/250 Hz

Height

1500 mm

Length

1000 mm


 

Dimensions and weight

  • Dimensions and weight
RKA 00104152_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 – 1499 mm in increments of 1 mm)
  • Length subdivided: 2501 – 3000 mm in increments of 1 mm
  • Undivided construction: H + L 4000 mm max., 80 kg max.

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.

RKA200-A, RKA200-B, weights

H RKA200-A RKA200-B
H L [mm]
H 500 750 1000 1250 1500 500 750 1000 1250 1500
mm kg

300

4

6

7

9

10

5

7

9

12

14

600

7

9

12

14

16

9

13

16

20

23

900

9

13

16

19

23

13

18

23

28

33

1200

12

16

20

24

29

16

23

29

36

43

1500

14

20

25

30

35

20

28

36

44

52


RKA200-C, RKA200-D, weights

H RKA200-C RKA200-D
H L [mm]
H 500 750 1000 1250 1500 500 750 1000 1250 1500
mm kg

300

6

9

12

14

17

7

11

14

17

21

600

11

16

21

26

30

14

19

25

31

37

900

16

23

30

37

43

20

28

37

45

54

1200

21

30

39

48

56

26

37

48

59

-

1500

26

37

48

59

69

32

45

59

-

-


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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Our department for Service-Requests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +43 1 250 43-0| Fax: +43 1 250 43 34