RK | TROX GmbH

Attenuators

Aerodynamically optimised splitter frame

Conforms to VDI 6022

RK

Splitter with high insertion loss in the low frequency range

Sound attenuator splitters with resonating panels, ready to be used in ventilation and air conditioning systems

Attenuation effect due to resonance
Energy efficient due to aerodynamically formed frame (bullnose radius 20 mm)
Acoustic data measured to EN ISO 7235
Sound absorbing material is biosoluble and hence hygienically safe
The sound absorbing material is non-combustible, to EN 13501, fire rating class A1
For use in areas with potentially explosive atmospheres (according to EC Directive 2014/34/EU (ATEX)), zones 1, 2, and zones 21 and 22 (outside) according to EC Directive 1999/92/EC
Operating temperature 100 °C max., up to 300 °C for a limited period of time

Optional equipment and accessories

Stainless and PUR-coated constructions on request

General information

Application

Sound attenuator splitters with resonating panels are used for the reduction of fan and air-regenerated noise in ventilation and air conditioning systems
Attenuation effect due to resonance
Attenuation particularly in the low frequency range of critical fan noise
Hygiene tested and compliant with VDI 6022
For use in areas with potentially explosive atmospheres (ATEX), zones 1, 2, 21 and 22 (outside) according to EC Directive 1999/92/EC.

Special characteristics

Resonating panels ensure increased insertion loss in the frequency range of critical fan noise
Energy-efficient due to aerodynamically formed splitter frame
- Up to 30 % lower differential pressure
Hygiene tested and compliant with VDI 6022

Nominal sizes

H: 150 – 1800 mm
L: 500, 750, 1000, 1250, 1500 mm
Intermediate sizes of H are possible: 150 – 1800 mm in increments of 1 mm
Intermediate lengths (L) are possible: 150 – 1500 mm in increments of 1 mm
H + L 600 mm min., 3300 mm max., 80 kg max.
Height and length subdivided: not available

Variants

Principal attenuation range

A: 250/125 Hz
C: 125/63 Hz

Construction

Materials and surfaces

No entry: Galvanised steel 1.0917
P1: Powder-coated RAL 7001, silver grey

Parts and characteristics

Aerodynamically formed frame
- Reduced weight and increased rigidity due to special profile
- Helps to optimise the airflow, hence reducing the air-regenerated noise
- Reduces the pressure loss
- Covers the edges of the sound absorbing material
Resonating panels fitted to reduce air-regenerated noise by resonance

Construction features

Sound absorbing material and resonating panels fitted to reduce air-regenerated noise by resonance
Aerodynamically formed splitter frame (bullnose radius 20 mm) that helps to reduce turbulence on both the upstream and downstream sides; frame with grooves for increased rigidity
Frame edges with bullnose to protect the infill
Operating temperature up to 100 °C, up to 300 °C for 8 h max.

Material and surfaces

Splitter frame, centre mullion and resonator plates made of galvanised sheet steel 1.0917
Sound absorbing material mineral wool
- According to EN 13501, fire rating class A1, non-combustible
- RAL quality mark RAL-GZ 388
- Non-hazardous thanks to high biosolubility according to the German Ordinance on Hazardous Substances and Note Q of the European Regulation (EC) No. 1272/2008
- Inert to fungal and bacterial growth according to EN 846

Standards and guidelines

Insertion loss and sound power level of air-regenerated noise tested to ISO 7235
Meets the hygiene requirements of VDI 6022, VDI 3803 Part 1 and DIN 1946 Part 4
EC Directive 2014/34/EC (ATEX): Equipment and protective systems intended for use in areas with potentially explosive atmospheres
EC Directive 1999/92/EC (ATEX): Improvement of the safety and health protection of workers potentially at risk from explosive atmospheres.

Maintenance

Low maintenance as construction and materials are not subject to wear
Regular cleaning intervals according to VDI6022

Technical information

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

Schematic illustration of RK

1 Splitter frame
2 Resonating panels on both sides
3 Sound absorbing material

The attenuation effect of the RK 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 (H × L)	150 × 450 – 1500 × 1500 mm, 450 × 150 – 1800 × 1500 mm
Height subdivide	Not available
Length subdivided	Not available
Intermediate sizes	In increments of 1 mm
Operating temperature	Up to 100 °C, up to 300 °C for 8h max.

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

RK200-A, insertion loss De [dB] and differential pressure Δpt [Pa]

L	Airway width	Centre frequency f_m [Hz]			v_s [m/s]
L	Airway width	63	125	250	6	10	14
500	50	6	17	12	21	58	114
500	100	5	10	5	11	31	61
1000	50	8	24	14	24	67	131
1000	100	5	18	6	13	35	69
1500	50	11	32	17	27	75	147
1500	100	8	25	8	14	40	78

RK200-C, insertion loss De [dB] and differential pressure Δpt [Pa]

L	Airway width	Centre frequency f_m [Hz]			v_s [m/s]
L	Airway width	63	125	250	6	10	14
500	50	8	14	7	21	58	114
500	100	3	6	3	11	31	61
1000	50	10	20	9	24	67	131
1000	100	7	10	4	13	35	69
1500	50	13	27	11	27	75	147
1500	100	10	13	5	14	40	78

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. Installation kit consists of an aerodynamically profiled frame (bullnose radius of 20 mm), sound absorbing material and resonating panels. The splitter frame reduces pressure losses and air-regenerated noise. The special profile helps to reduce the weight and increase the rigidity of the splitters. Frame edges with bullnose to protect the sound absorbing infill. Insertion loss and sound power level of air-regenerated noise measured according to EN ISO 7235. Hygiene compliant with VDI 6022, VDI 3803 Part 1 and DIN 1946 Part 4. Suitable for areas with potentially explosive atmospheres (ATEX), zones 1, 2, 21 and 22 (outside) according to Directive 1999/92/EC.

Special characteristics

Resonating panels ensure increased insertion loss in the frequency range of critical fan noise
Energy-efficient due to aerodynamically formed splitter frame
- Up to 30 % lower differential pressure
Hygiene tested and compliant with VDI 6022

Material and surfaces

Splitter frame, centre mullion and resonator plates made of galvanised sheet steel 1.0917
Sound absorbing material mineral wool
- According to EN 13501, fire rating class A1, non-combustible
- RAL quality mark RAL-GZ 388
- Non-hazardous thanks to high biosolubility according to the German Ordinance on Hazardous Substances and Note Q of the European Regulation (EC) No. 1272/2008
- Inert to fungal and bacterial growth according to EN 846

Variants

Principal attenuation range

A: 250/125 Hz
C: 125/63 Hz

Construction

Materials and surfaces

No entry: Galvanised steel 1.0917
P1: Powder-coated RAL 7001, silver grey

Technical data

Splitter thickness: 200 mm
Nominal sizes: 150 × 450 – 1500 × 1500 mm, 450 × 150 – 1800 × 1500 mm
Intermediate sizes: in increments of 1 mm
Operating temperature up to 100 °C, up to 300 °C for 8 h max.

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

Sizing data

B [mm]
H [mm]
L (in airflow direction) [mm]
q_v (m³/h)
D_e At 250 Hz [dB]
Δp_st [Pa]

–

…

–

200

600

1500

1 Type
RK Sound attenuator splitter

2 Variant
No entry: TROX standard variants

3 Resonator construction
Optimised for the following frequencies
A 250/125 Hz
C 125/63 Hz

4 Material
No entry: galvanised steel (1.0917)
P1 powder-coated RAL 7001 (silver grey)

5 Splitter thickness [mm]
200

6 Height [mm]
150 – 1800

7 Length in airflow direction [mm]
150 – 1500

Order example: RK–A/200×1000×1200

Resonator construction	250/125 Hz
Height	1000 mm
Length	1200 mm

Dimensions, Weights, Installation details

H: 150 – 1800 mm
L: 500, 750, 1000, 1250, 1500 mm
T: 200 mm
Intermediate heights (H) are possible: 150 – 1800 mm in increments of 1 mm
Intermediate lengths (L) are possible: 150 – 1500 mm in increments of 1 mm
H + L 3300 mm max., 80 kg max.

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

RK-A [kg]

Upstream conditions after bends, junctions or a narrowing or widening of the duct, vertical upstream section, splitters upright

B Width of the sound attenuator

H Height of the sound attenuator and the splitters

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 pection against the effects of weather

Downloads

product information

Product data sheet Type RK

RK_PD_2024_04_17_DE_en Product data sheet 3 MB pdf

certificates

ATEX manufacturer's statement RK

RK-Atex_CE_ATEX_2022_02_23_DE_en Manufacturer's statement 1,4 MB pdf
Declaration of hygiene conformity RK

RK_HC_2024_05_DE_en Conformity 1,3 MB pdf
Non-CE Manufacturer's statement RK

RK_NotCE_2022_02_08_14_49_11_DE_en Certificate 1,4 MB pdf

operation manuals

Installation manual RK

XS_MS_XK_MK_RK_IM_A00000090240_V1_2022_04_GB_en Installation manual 2,7 MB pdf

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RK

Splitter with high insertion loss in the low frequency range

General information

Technical information

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

Dimensions, Weights, Installation details

Downloads

product information

Product data sheet Type RK

certificates

ATEX manufacturer's statement RK

Declaration of hygiene conformity RK

Non-CE Manufacturer's statement RK

operation manuals

Installation manual RK

TECHNICALLY NECESSARY

STATISTICS AND WEBSITE ANALYSIS

CONVENIENCE AND PERSONALISATION

FOR THE BEST TROX EXPERIENCE