Ceiling Swirl Diffusers

Circular diffuser face 

Circular plenum

Internal thermal actuator

RFD-V 

WITH LOW SOUND POWER LEVEL FOR COMFORT AND INDUSTRIAL ZONES, WITH FIXED AIR CONTROL BLADES AND VARIABLE INTERNAL GEOMETRY

  • Circular swirl diffusers for exposed installation
  • Nominal sizes 160, 200, 250, 315
  • Volume flow rate range 9l/s – 195l/s or 32m³/h – 702m³/h
  • For variable and constant volume flows
  • Available in RAL CLASSIC colours
  • Horizontal duct connection
  • Plenum box with damper blade and pressure tap
  • Internal thermal actuator

General information

Application

  • Type RFD-V ceiling swirl diffusers are used as supply or extract air diffusers for comfort and industrial zones
  • Attractive design element for building owners and architects with demanding aesthetic requirements
  • Horizontal 360° supply air discharge for mixed flow ventilation
  • The efficient swirl creates high induction levels, thereby rapidly reducing the temperature difference and airflow velocity (supply air)
  • Designed for freely suspended applications
  • For variable and constant volume flows
  • For supply air to room air temperature differences -10 to +15 K


Special characteristics

  • Low sound power level, ideal for comfort zones
  • Fixed blades
  • Diaphragm for volume flow determination
  • Optional internal lining, closed or open cell
  • Internal thermal actuator (supply only)


Nominal sizes

  • 160, 200, 250, 315


Construction

Diffuser face finish

  • P3: Powder-coated RAL9010, pure white, gloss level 20%
  • P2: Powder-coated RAL9006, white aluminium, gloss level 30%
  • P4: Powder-coated RAL9005, jet black, gloss level 20%
  • P6: Powder-coated in any other RAL CLASSIC colour, gloss level 30%

Plenum finish

  • 0: Natural (unpainted)
  • P3: Powder-coated RAL9010, pure white, gloss level 20%
  • P2: Powder-coated RAL9006, white aluminium, gloss level 30%
  • P4: Powder-coated RAL9005, jet black, gloss level 20%
  • P6: Powder-coated in any other RAL CLASSIC colour, gloss level 30%


Material and surfaces

  • Diffuser face made of galvanised steel
  • Discharge nozzle made of aluminium
  • Plenum box, non-visible adjustment mechanism and cross bar made of galvanised sheet steel


Standards and guidelines

  • Sound power level of the air-regenerated noise measured according to EN ISO 5135


Maintenance

  • Low maintenance as construction and materials are not subject to wear
  • Inspection and cleaning to VDI 6022

Technical information

  • FUNCTION 
  • TECHNICAL DATA 
  • QUICK SIZING
  • SPECIFICATION TEXT
  • ORDER CODE

1 Discharge nozzle 
2 Swirl element 
3 Air distribution element
4 Pressure Diaphragm
5 Retractable sleeve
6 Thermal actuator
7 Spigot damper
8 Lip seal
9 Pressure tap

Ceiling diffusers direct the air from air conditioning systems into the room. The resulting airflow induces high levels of room air, thereby rapidly reducing the airflow velocity and the temperature difference between supply air and room air. Ceiling diffusers allow for large volume flow rates. The result is a mixed flow ventilation in comfort zones, with good overall room ventilation, creating only very little turbulence in the occupied zone. Type RFD-V ceiling diffusers have fixed blades and an adjustable internal sleeve, allowing for horizontal and vertical air discharge. During cooling air discharge is horizontal and radial, in heating air discharge is vertical. The internal sleeve is controlled with a thermal actuator. The supply air to room air temperature difference may range from -10 to +15K. To give rooms an aesthetic, uniform look, type RFD-V diffusers may also be used for extract air.

Nominal diffuser sizes

160, 200, 250, 315

Minimum volume flow rate, with Δtz = -8K

9l/s - 32l/s or 32m3/h - 307m3/h

Maximum volume flow rate with LWA ≈ 50dB(A)

64l/s - 195l/s or 230m3/h - 702m3/h


Usage instructions

Please note that the minimum volume flows are not valid for free hanging or exposed installation. For these types of installation the
minimum recommended flow rate is equivalent to an effective discharge velocity of 3.5m/s

Quick sizing tables provide a good overview of the volume flow rates and corresponding sound power levels and differential pressures. The minimum volume flow rates apply to a supply air to room air temperature difference of –6 K. The maximum volume flow rates apply to a sound power level of approx. 50 dB (A) with damper blade position 0°.


RFD-V-... (supply air), sound power level and total differential pressure


Nominal size


qv [l/s]


qv [m³/h]


Ø Spigot

Damper blade position

0⁰

45⁰

90⁰

Δpₜ [Pa]

LWA [dB(A)]

Δpₜ [Pa]

LWA [dB(A)]

Δpₜ [Pa]

LWA [dB(A)]

160

20

72

158

6

17

7

16

10

17

160

33

118.8

158

15

31

19

31

27

31

160

47

169.2

158

31

41

38

41

56

41

160

60

216

158

51

48

61

48

91

48

200

30

108

198

5

17

7

17

9

17

200

50

180

198

14

32

18

32

26

32

200

70

252

198

28

42

36

42

51

42

200

90

324

198

46

50

60

50

85

50

250

50

180

248

5

20

7

20

10

20

250

80

288

248

14

34

19

34

26

34

250

110

396

248

26

43

36

43

50

43

250

140

504

248

41

50

58

51

81

50

315

70

252

313

5

20

6

20

9

19

315

110

396

313

12

34

16

33

23

33

315

150

540

313

23

43

30

43

42

42

315

190

684

313

36

50

48

50

67

49

Specification text

Swirl diffusers with circular diffuser face. Supply and extract air variants for comfort zones and industrial zones. Diffuser face with fixed control blades and variable internal geometry controlled via thermal actuator. In cooling supply air will discharge in a horizontal swirling pattern creating high induction levels. In heating supply air will switch to vertical discharge to penetrate into the occupied zone. For installation into all types of suspended ceilings and rooms without suspended ceilings. Ready-to-install component which consists of the diffuser face with radially arranged fixed air control blades and a plenum box with side entry, and suspension holes or suspension lugs. The diffuser face is fixed to the cross bar with a central screw. Thermal Actuator temperature range 18 °C to 32 °C. Spigot suitable for ducts to EN 1506 or EN 13180. Sound power level of the air-regenerated noise measured according to EN ISO 5135.
Note: Cooling supply air temperature of <22°C required to reset the thermal actuator
Note: Vertical heating requires supply air temperature of >28°C


Parts and characteristics

  • Circular diffuser face
  • Diffuser with radially arranged fixed air control blades
  • Simple installation of the diffuser due to central rivnut
  • Damper blade for volume flow rate balancing


Materials and surfaces

  • Diffuser face made of galvanised steel
  • Discharge nozzle made of aluminium
  • Plenum box, non-visible adjustment mechanism and cross bar made of galvanised sheet steel
  • P2: Powder-coated RAL 9006: 30 %
  • P3: Powder-coated RAL 9010: 20 %
  • P4: Powder-coated RAL 9005: 20 %
  • P6: Powder-coated RAL CLASSIC colour 30 % gloss


Technical data

  • Nominal diffuser sizes: 160, 200, 250, 315
  • Minimum volume flow rate, with Δtz = -8K: 9l/s – 32l/s or 32m³/h – 307m³/h
  • Maximum volume flow rate with LWA ≈ 50dB(A): 64l/s – 195l/ s or 230m³/h – 702m³/h


Usage instructions

  • Please note that the minimum volume flows are not valid for free hanging or exposed installation. For these types of installation, the recommended minimum flow rate is equivalent to an effective discharge velocity of 3.5m/s
RFD-V–Z–DX–D12–M–L–ADE/200x198/SB/P3– P6 - RAL 9016
||||| | | ||
||
|
1234 5 6 7 89101112
1 Type
RFD-V Swirl diffuser


2 System
Z Supply air
A Extract air


3 Construction
DX Standard


4 Inner lining (insulation)
No entry: without lining
D06 inner lining 6 mm thick
D12 inner lining 12 mm thick


5 Spigot damper for flow rate balancing
M with damper screen


6 Lip seal
No entry: without lip seal
L with lip seal


7 Air distribution element
No entry: without air distribution element
ADE with air distribution element


8 Nominal size [mm]
160, 200, 250, 315


9 Spigot diameter [mm]
158 (only for nominal size 160)
198 (only for nominal size 200, 250)
248 (only for nominal size 200, 250, 315)
313 (only for nominal size 315)


10 Plenum box fixing
No entry: central threaded rod
SB Fixing bracket


11 Exposed surface of diffuser face
P2 powder-coated RAL 9006 (white aluminium)
P3 powder-coated, RAL 9010 (pure white)
P4 powder-coated, RAL 9005 (deep black)
P6 powder-coated, specify RAL CLASSIC colour


12 Surface plenum box
No entry: without surface finish
P2 powder-coated RAL 9006 (white aluminium)
P3 powder-coated, RAL 9010 (pure white)
P4 powder-coated, RAL 9005 (deep black)
P6 powder-coated, specify RAL CLASSIC colour


Gloss level
RAL 9006 GU 30
RAL 9010 and RAL 9005 GU 20
All other RAL colours GU 30


Order example: RFD-V-Z-DX-D12-M-L/200×198/SB/P3-P6-RAL9016

Type RFD-V – swirl diffuser
Systemsupply air
Constructionstandard
Inner lining (insulation)inner lining 12 mm thick 
Spigot damper for volume flow rate balancingwith spigot damper 
Lip sealwith lip seal 
Air distribution element with air distribution element 
Normal size [mm]200
Spigot diameter [mm]198
Plenum box fixing fixing brackets 
Exposed surface of diffuser facepowder-coated, RAL 9010 (pure white)
Surface plenum boxpowder-coated, RAL 9016 (traffic white)


Downloads

product information

  • Adjustment Data for RFD-V supply air diffusers

    RFD-V_PD_2024_04_DE_en 180 KB pdf

  • Product data sheet  RFD-V

    RFD-V_PD_2024_12_11_DE_en 930 KB pdf

operation manuals

  • Installation manual RFD-V

    RFD-V_IM_CD10036_V3_2024_12_GB_en Installation manual 1,2 MB pdf
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We are here for you

Please specify your message and type of request
Tel.: +49 (0)2845 / 202-0 | Fax: +49 (0)2845/202-265

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Contact

Thank you for your message!

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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.: +49 (0)2845 / 202-0 | Fax: +49 (0)2845/202-265

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