Type RFD

With low sound power level for comfort and industrial zones, with fixed air control blades

Circular and square ceiling swirl diffusers

  • Nominal sizes 125, 160, 200, 250, 315, 400
  • Volume flow rate range 4 – 330 l/s or 14 – 1188 m³/h
  • Diffuser face made of galvanised sheet steel, powder-coated, or of aluminium (depending on variant)
  • For supply and extract air
  • For variable and constant volume flows
  • For all types of ceiling systems
  • With discharge nozzle ideal for cooling in case of freely suspended installation
  • High induction results in a rapid reduction of the temperature difference and airflow velocity
  • Air change rates of up to 35 per hour can be achieved by arranging several diffusers in a row with a minimum pitch of 0.9 m (centre line to centre line)
  • Ideal for comfort zones


Optional equipment and accessories

  • Exposed diffuser face available in RAL CLASSIC colours
  • Horizontal or vertical duct connection
  • Plenum box with cord-operated damper blade and pressure tap
  • Shallow plenum box

RFD-Q-D 00132669_0


  • Application
  • Description

Application

  • Type RFD ceiling swirl diffusers are used as supply air or extract air diffusers for comfort zones
  • Attractive design element for building owners and architects with demanding aesthetic requirements
  • Horizontal swirling 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 variant)
  • For variable and constant volume flows
  • For supply air to room air temperature differences from –12 to +10 K
  • For room heights up to 4 m (lower edge of suspended ceiling)
  • For all types of ceiling systems
  • With an extended border and discharge nozzle also suitable for freely suspended installation (supply air variant)

Special characteristics

  • Low sound power level, ideal for comfort zones
  • Fixed blades
  • For all types of ceiling systems
  • Horizontal or vertical duct connection
  • Air change rates of up to 35 per hour can be achieved by arranging several diffusers in a row with a minimum pitch of 0.9 m (centre line to centre line)

Nominal sizes

  • 125, 160, 200, 250, 315, 400

Variants

  • RFD-Q: Square diffuser face
  • RFD-R: Circular diffuser face
  • RFD-*-D: Diffuser face with discharge nozzle


Connection

  • K: Vertical duct connection, with duct collar
  • US: Vertical duct connection, with transition piece
  • A: Horizontal duct connection, with plenum box


Only RFD-R

  • UO: Vertical duct connection, with transition piece and cross bar


Only RFD-R-D

  • UD: Vertical duct connection, with transition piece, cross bar and discharge nozzle
  • N: Horizontal duct connection, with shallow plenum box to be installed above open cell ceilings

Parts and characteristics

  • Circular or square diffuser face
  • Diffuser face with radially arranged fixed air control blades

Attachments

  • M: Damper blade for volume flow rate balancing
  • MN: Pressure tap and cord-operated damper blade for volume flow rate balancing with the diffuser face in place

Accessories

  • Lip seal

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180
  • Spigot with groove for lip seal (if accessory lip seal has been ordered)

Materials and surfaces

  • Q: Diffuser face made of aluminium
  • R: Diffuser face made of galvanised sheet steel
  • Plenum box, duct collar and cross bar made of galvanised sheet steel
  • Transition piece made of aluminium
  • Lip seal made of rubber
  • Diffuser face powder-coated RAL 9010, pure white
  • P1: Powder-coated, RAL CLASSIC colour

Standards and guidelines

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

Maintenance

  • Maintenance-free 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

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

Functional description

Ceiling swirl diffusers in air conditioning systems create a swirl to supply air to rooms. 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 swirl 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 ceiling swirl diffusers have fixed blades. Air discharge is horizontal omni directional. The supply air to room air temperature difference may range from –12 to +10 K.

A damper blade (optional) simplifies volume flow rate balancing for commissioning. Pressure tap and cord-operated damper blade (optional) allow for volume flow rate balancing with the diffuser face in place.

To give rooms an aesthetic, uniform look, Type RFD diffusers may also be used for extract air.

Nominal sizes

125, 160, 200, 250, 315, 400 mm

Minimum volume flow rate, with ΔtZ = –6 K 

4 – 36 l/s or 14 – 130 m³/h

Maximum volume flow rate, with LWA ≅ 50 dB(A)

22 – 330 l/s or 79 – 1188 m³/h

Supply air to room air temperature difference

–12 to +10 K


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°.

Exact values for all parameters can be determined with our Easy Product Finder design programme.

RFD-*-K, sound power level and total differential pressure

Nominal size V Δpt LWA
Nominal size l/s m³/h Pa dB(A)

125

4.4

16

2

<15

125

10

36

16

29

125

15

54

36

38

125

24

86

92

50

160

5

18

1

<15

160

15

54

8

16

160

30

108

34

34

160

47

169

83

50

200

7

25

1

<15

200

30

108

15

26

200

50

180

43

38

200

75

270

96

50

250

10

36

1

<15

250

45

162

14

27

250

80

288

43

41

250

114

410

87

50

315

19

68

1

<15

315

75

270

12

25

315

130

468

37

40

315

185

666

75

50

400

27

97

1

<15

400

95

342

12

26

400

165

594

35

40

400

230

828

69

50


RFD-*-D-K, sound power level and total differential pressure

Nominal size V Δpt LWA
Nominal size l/s m³/h Pa dB(A)

125

4.4

16

1

<15

125

15

54

8

18

125

30

108

33

36

125

46

166

79

50

160

6,4

23

1

<15

160

25

90

8

16

160

45

162

26

33

160

76

274

74

50

200

9

32

0

<15

200

45

162

11

23

200

75

270

31

37

200

110

396

66

50

250

14

50

0

<15

250

65

234

10

21

250

115

414

33

38

250

164

590

66

50

315

25

90

1

<15

315

95

342

11

23

315

165

594

32

38

315

240

864

67

50

400

36

130

1

<15

400

135

486

12

24

400

235

846

36

40

400

330

1188

71

50


RFD-*-US, sound power level and total differential pressure

Nominal size V Δpt LWA
Nominal size l/s m³/h Pa dB(A)

125

4

14

2

<15

125

10

36

17

28

125

15

54

37

39

125

22

79

80

50

160

5

18

1

<15

160

20

72

15

24

160

30

108

35

37

160

42

151

68

50

200

7

25

1

<15

200

30

108

22

23

200

50

180

60

39

200

70

252

117

50

250

10

36

1

<15

250

45

162

19

25

250

80

288

61

40

250

114

410

123

50

315

19

68

1

<15

315

70

252

17

25

315

130

468

59

42

315

170

612

101

50

400

27

97

1

<15

400

90

324

15

24

400

155

558

44

39

400

220

792

88

50


RFD-*-D-US, sound power level and total differential pressure

Nominal size V Δpt LWA
Nominal size l/s m³/h Pa dB(A)

125

4.4

16

1

<15

125

15

54

10

17

125

25

90

28

34

125

38

137

64

50

160

6

22

1

<15

160

25

90

9

16

160

45

162

29

35

160

66

238

62

50

200

9

32

1

<15

200

40

144

22

20

200

70

252

66

37

200

102

367

140

50

250

14

50

1

<15

250

60

216

21

22

250

105

378

63

39

250

145

522

120

50

315

25

90

2

<15

315

90

324

21

22

315

155

558

62

38

315

220

792

125

50

400

36

130

1

<15

400

120

432

17

22

400

205

738

49

38

400

285

1026

95

50


RFD-*-A, sound power level and total differential pressure

Nominal size V Damper blade position
Nominal size V 45° 90°
Nominal size V Δpt LWA Δpt LWA Δpt LWA
Nominal size l/s m³/h Pa dB(A) Pa dB(A) Pa dB(A)

125

4

14

2

<15

3

<15

4

<15

125

10

36

17

28

19

28

26

28

125

15

54

38

38

43

39

58

38

125

22

79

82

50

93

49

124

50

160

5

18

1

<15

1

<15

1

<15

160

15

54

9

16

11

17

15

15

160

30

108

35

34

43

36

60

34

160

47

169

86

50

105

51

147

51

200

7

25

1

<15

1

<15

1

<15

200

25

90

12

21

15

21

20

21

200

44

158

36

35

45

36

61

35

200

70

252

91

50

114

52

156

51

250

10

36

1

<15

1

<15

1

<15

250

45

162

14

25

19

26

25

25

250

75

270

40

38

52

40

70

39

250

110

396

86

50

113

52

151

52

315

19

68

1

<15

1

<15

2

<15

315

70

252

12

24

17

26

22

24

315

120

432

35

39

49

40

63

38

315

175

630

75

50

103

52

135

50

400

27

97

1

<15

1

<15

1

<15

400

90

324

10

24

13

25

17

24

400

160

576

33

40

40

41

53

39

400

220

792

63

50

75

52

100

49


RFD-*-D-A, sound power level and total differential pressure

Nominal size V Damper blade position
Nominal size V 45° 90°
Nominal size V Δpt LWA Δpt LWA Δpt LWA
Nominal size l/s m³/h Pa dB(A) Pa dB(A) Pa dB(A)

125

4.4

16

1

<15

1

<15

3

<15

125

15

54

12

19

17

20

33

23

125

30

108

48

37

68

40

132

41

125

43

155

98

50

139

52

271

53

160

6.4

23

1

<15

1

<15

2

<15

160

30

108

16

22

24

22

44

25

160

50

180

45

37

68

38

123

41

160

71

256

91

50

138

53

250

54

200

9

32

1

<15

1

<15

2

<15

200

40

144

13

21

19

22

34

24

200

70

252

39

37

59

38

104

40

200

105

378

89

50

133

53

234

54

250

14

50

1

<15

1

<15

2

<15

250

60

216

12

20

18

23

32

23

250

108

389

39

37

58

39

103

40

250

153

551

79

50

116

53

207

52

315

25

90

1

<15

2

<15

2

<15

315

90

324

13

23

20

25

29

25

315

150

540

35

38

55

40

82

40

315

215

774

72

50

114

52

168

52

400

36

130

1

<15

1

<15

2

<15

400

120

432

11

23

15

23

22

23

400

205

738

33

38

44

39

65

39

400

290

1044

65

50

87

50

131

51


Ceiling swirl diffusers with square or circular diffuser face. Supply air and extract air variants for comfort zones and industrial zones. Diffuser face with fixed air control blades for horizontal swirling supply air discharge creating high induction levels. For installation into all types of suspended ceilings.

Ready-to-install component which consists of the diffuser face with radially arranged fixed air control blades and either a spigot only or a plenum box with side entry or top entry spigot, and suspension holes or suspension lugs.

The diffuser face is fixed to the cross bar with a central screw.

Spigot suitable for ducts to EN 1506 or EN 13180.

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

Special characteristics

  • Low sound power level, ideal for comfort zones
  • Fixed blades
  • For all types of ceiling systems
  • Horizontal or vertical duct connection
  • Air change rates of up to 35 per hour can be achieved by arranging several diffusers in a row with a minimum pitch of 0.9 m (centre line to centre line)

Materials and surfaces

  • Q: Diffuser face made of aluminium
  • R: Diffuser face made of galvanised sheet steel
  • Plenum box, duct collar and cross bar made of galvanised sheet steel
  • Transition piece made of aluminium
  • Lip seal made of rubber
  • Diffuser face powder-coated RAL 9010, pure white
  • P1: Powder-coated, RAL CLASSIC colour

Technical data

  • Nominal sizes: 125, 160, 200, 250, 315, 400 mm
  • Minimum volume flow rate, with ΔtZ = –6 K: 4 – 36 l/s or 14 – 130 m³/h
  • Maximum volume flow rate, with LWA ≅ 50 dB(A): 22 – 330 l/s or 79 – 1188 m³/h
  • Supply air to room air temperature difference: –12 to +10 K

Sizing data

  • V _______________________ [m³/h]
  • Δpt _______________________ [Pa]

Air-regenerated noise

  • LWA _______________________ [dB(A)]

00133897_0

 Type
RFD       Swirl diffuser

 Construction style
R       Circular
Q       Square

 Construction
       No entry: without discharge nozzle
D       With discharge nozzle

 Connection
K       Vertical, with duct collar
US       Vertical, with transition piece
A       Horizontal, with plenum box
               Only RFD-R
UO       Vertical, with transition piece and cross bar
               Only RFD-R-D
UD       Vertical, with transition piece, cross bar and discharge nozzle
N       Horizontal, with shallow plenum box

 

 Damper blade for volume flow rate balancing
       No entry: none
M       With (only for connection types A and N)
MN       With cords and pressure tap (only for connection type A)

 Accessories
       No entry: none
L       With lip seal (only for connection types A and N)

 Nominal size [mm]
125
160
200
250
315
400

 Exposed surface
       No entry required
              Powder-coated RAL 9010, pure white

       Gloss level
       RAL 9010 50 %
       RAL 9006 30 %
       All other RAL colours 70 %

Order example: RFD–Q–D–A–M–L/200/P1-RAL 9016

Construction style

Square

Construction

With discharge nozzle

Connection

Horizontal

Damper blade for volume flow rate balancing

With

Accessories

Lip seal

Nominal size

200

Exposed surface

RAL 9016, traffic white, gloss level 70 %


 

Variants, Dimensions and weight, Product details

  • Variants
  • Dimensions and weight
  • Product details

RFD-Q-K

Variant

  • Ceiling swirl diffuser with square diffuser face

Nominal sizes

  • 125, 160, 200, 250, 315, 400

Parts and characteristics

  • Square diffuser face
  • Circular duct collar for connection to a vertical duct

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-Q-D-K

Variant

  • Ceiling swirl diffuser with discharge nozzle and square diffuser face

Nominal sizes

  • 125, 160, 200, 250, 315, 400

Parts and characteristics

  • Square diffuser face
  • Discharge nozzle improves aerodynamic and acoustic characteristics
  • Circular duct collar for connection to a vertical duct

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-Q-US

Variant

  • Ceiling swirl diffuser with square diffuser face

Nominal sizes

  • 125, 160, 200, 250, 315, 400

Parts and characteristics

  • Square diffuser face
  • Transition piece for connection to a vertical duct

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-Q-D-US

Variant

  • Ceiling swirl diffuser with discharge nozzle and square diffuser face

Nominal sizes

  • 125, 160, 200, 250, 315, 400

Parts and characteristics

  • Square diffuser face
  • Discharge nozzle improves aerodynamic and acoustic characteristics
  • Transition piece for connection to a vertical duct

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-Q-A

Variant

  • Ceiling swirl diffuser with square diffuser face

Nominal sizes

  • 125, 160, 200, 250, 315, 400

Parts and characteristics

  • Square diffuser face
  • Plenum box for horizontal duct connection
  • Circular opening to accommodate the diffuser face
  • Simple installation of the diffuser face due to central fixing screw with decorative cap
  • Damper blade for volume flow rate balancing (optional)
  • Pressure tap and cord-operated damper blade for volume flow rate balancing (optional)
  • Lip seal (optional)

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180
  • Spigot with groove for lip seal (if accessory lip seal has been ordered)

RFD-Q-D-A

Variant

  • Ceiling swirl diffuser with discharge nozzle and square diffuser face

Nominal sizes

  • 125, 160, 200, 250, 315, 400

Parts and characteristics

  • Square diffuser face
  • Discharge nozzle improves aerodynamic and acoustic characteristics
  • Plenum box for horizontal duct connection
  • Circular opening to accommodate the diffuser face
  • Simple installation of the diffuser face due to central fixing screw with decorative cap
  • Damper blade for volume flow rate balancing (optional)
  • Pressure tap and cord-operated damper blade for volume flow rate balancing (optional)
  • Lip seal (optional)

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180
  • Spigot with groove for lip seal (if accessory lip seal has been ordered)

RFD-R-K

Variant

  • Ceiling swirl diffuser with circular diffuser face

Nominal sizes

  • 125, 160, 200, 250, 315, 400

Parts and characteristics

  • Circular diffuser face
  • Circular duct collar for connection to a vertical duct

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-R-D-K

Variant

  • Ceiling swirl diffuser with discharge nozzle and circular diffuser face

Nominal sizes

  • 125, 160, 200, 250, 315, 400

Parts and characteristics

  • Circular diffuser face
  • Discharge nozzle improves aerodynamic and acoustic characteristics
  • Circular duct collar for connection to a vertical duct

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-R-US

Variant

  • Ceiling swirl diffuser with circular diffuser face

Nominal sizes

  • 125, 160, 200, 250, 315, 400

Parts and characteristics

  • Circular diffuser face
  • Transition piece for connection to a vertical duct

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-R-D-US

Variant

  • Ceiling swirl diffuser with discharge nozzle and circular diffuser face

Nominal sizes

  • 125, 160, 200, 250, 315, 400

Parts and characteristics

  • Circular diffuser face
  • Discharge nozzle improves aerodynamic and acoustic characteristics
  • Transition piece for connection to a vertical duct

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-R-UO

Variant

  • Ceiling swirl diffuser with circular diffuser face

Nominal sizes

  • 125, 160, 200, 250, 315, 400

Parts and characteristics

  • Circular diffuser face
  • Transition piece for connection to a vertical duct
  • Simple installation of the diffuser face due to central fixing screw with decorative cap

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-R-D-UD

Variant

  • Ceiling swirl diffuser with discharge nozzle and circular diffuser face

Nominal sizes

  • 125, 160, 200, 250, 315, 400

Parts and characteristics

  • Circular diffuser face
  • Discharge nozzle improves aerodynamic and acoustic characteristics
  • Transition piece for connection to a vertical duct
  • Simple installation of the diffuser face due to central fixing screw with decorative cap

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-R-A

Variant

  • Ceiling swirl diffuser with circular diffuser face

Nominal sizes

  • 125, 160, 200, 250, 315, 400

Parts and characteristics

  • Circular diffuser face
  • Plenum box for horizontal duct connection
  • Circular opening to accommodate the diffuser face
  • Simple installation of the diffuser face due to central fixing screw with decorative cap
  • Damper blade for volume flow rate balancing (optional)
  • Pressure tap and cord-operated damper blade for volume flow rate balancing (optional)
  • Lip seal (optional)

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180
  • Spigot with groove for lip seal (if accessory lip seal has been ordered)

RFD-R-D-A

Variant

  • Ceiling swirl diffuser with discharge nozzle and circular diffuser face

Nominal sizes

  • 125, 160, 200, 250, 315, 400

Parts and characteristics

  • Circular diffuser face
  • Discharge nozzle improves aerodynamic and acoustic characteristics
  • Plenum box for horizontal duct connection
  • Circular opening to accommodate the diffuser face
  • Simple installation of the diffuser face due to central fixing screw with decorative cap
  • Damper blade for volume flow rate balancing (optional)
  • Pressure tap and cord-operated damper blade for volume flow rate balancing (optional)
  • Lip seal (optional)

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180
  • Spigot with groove for lip seal (if accessory lip seal has been ordered)

RFD-R-D-N

Variant

  • Ceiling swirl diffuser with discharge nozzle and circular diffuser face

Nominal sizes

  • 125, 160, 200, 250, 315, 400

Parts and characteristics

  • Circular diffuser face
  • Discharge nozzle improves aerodynamic and acoustic characteristics
  • Plenum box for horizontal duct connection
  • Compact unit which consists of the diffuser and a plenum box, shallow construction for installation above open cell ceilings
  • Damper blade for volume flow rate balancing (optional)
  • Lip seal (optional)

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180
  • Spigot with groove for lip seal (if accessory lip seal has been ordered)

RFD-Q-K, RFD-Q-D-K

Nominal size
RFD-Q-K
□Q1
mm
RFD-Q-K
H2
mm
RFD-Q-K
m
kg
RFD-Q-D-K
□Q1
mm
RFD-Q-D-K
H2
mm
RFD-Q-D-K
m
kg
ØD
mm
H1
mm
125 198 42 0.6 198 67 0.7 123 8
160 198 45 0.7 248 70 0.9 158 8
200 248 45 1.0 248 70 1.2 198 8
250 298 42 1.5 298 67 1.7 248 8
315 398 45 2.4 398 80 2.9 313 8
400 498 45 3.6 498 80 4.3 398 8


RFD-Q-US, RFD-Q-D-US

Nominal size
RFD-Q-US
□Q1
mm
RFD-Q-US
H2
mm
RFD-Q-US
m
kg
RFD-Q-D-US
□Q1
mm
RFD-Q-D-US
H2
mm
RFD-Q-D-US
m
kg
ØD
mm
H1
mm
ØD3
mm
C
mm
125 198 120 0.7 198 145 0.8 98 8 127 40
160 198 125 0.9 248 150 1.1 123 8 162 40
200 248 128 1.2 248 153 1.4 158 8 202 40
250 298 133 1.7 298 158 2.0 198 8 252 40
315 398 140 2.7 398 175 3.2 248 8 318 40
400 498 150 4.1 498 185 4.7 313 8 403 40


RFD-Q-A, RFD-Q-D-A

Nominal size
RFD-Q-A
□Q1
mm
RFD-Q-A
H3
mm
RFD-Q-A
A
mm
RFD-Q-A
m
kg
RFD-Q-D-A
□Q1
mm
RFD-Q-D-A
H3
mm
RFD-Q-D-A
A
mm
RFD-Q-D-A
m
kg
H1
mm
□Q3
mm
H4
mm
ØD4
mm
ØD
mm
C
mm
Plenum box
125 198 255 170 3.0 198 276 196 3.1 8 216 195 125 98 50 AK-Uni-028
160 198 280 182 3.5 248 301 208 3.8 8 266 220 160 123 48 AK-Uni-029
200 248 310 194 4.3 248 331 220 4.5 8 290 250 200 158 50 AK-Uni-030
250 298 355 219 8.7 298 376 245 9.0 8 476 295 250 198 50 AK-Uni-031
315 398 395 244 12.0 398 436 281 12.5 8 567 345 315 248 48 AK-Uni-032
400 498 470 277 15.1 498 501 313 15.8 8 615 410 400 313 50 AK-Uni-033


RFD-R-K, RFD-R-D-K

Nominal size
RFD-R-K
ØD1
mm
RFD-R-K
Aeff

RFD-R-K
H2
mm
RFD-R-K
m
kg
RFD-R-D-K
ØD1
mm
RFD-R-D-K
Aeff

RFD-R-D-K
H2
mm
RFD-R-D-K
m
kg
ØD2
mm
ØD
mm
H1
mm
125 158 0.0026 42 0.4 200 0.0034 67 0.5 120 123 8
160 197 0.0037 45 0.6 250 0.0060 70 1.0 155 158 8
200 241 0.0066 45 0.9 300 0.0092 70 1.3 195 198 8
250 295 0.0110 42 1.3 350 0.0150 67 1.8 245 248 8
315 364 0.0205 45 1.9 450 0.0265 80 2.8 310 313 8
400 450 0.0280 45 2.9 580 0.0355 80 4.1 395 398 8


RFD-R-US, RFD-R-D-US

Nominal size
RFD-R-US
ØD1
mm
RFD-R-US
H2
mm
RFD-R-US
m
kg
RFD-R-D-US
ØD1
mm
RFD-R-D-US
H2
mm
RFD-R-D-US
m
kg
ØD
mm
H1
mm
ØD3
mm
C
mm
125 158 120 0.5 200 153 0.6 98 8 127 40
160 197 125 0.8 250 158 1.1 123 8 162 40
200 241 128 1.1 300 161 1.5 158 8 202 40
250 295 133 1.6 350 166 2.1 198 8 252 40
315 364 140 2.3 450 183 3.2 248 8 318 40
400 450 150 3.4 580 193 4.6 313 8 403 40


RFD-R-UO, RFD-R-D-UD

Nominal size
RFD-R-UO
ØD1
mm
RFD-R-UO
H2
mm
RFD-R-UO
m
kg
RFD-R-D-UD
ØD1
mm
RFD-R-D-UD
H2
mm
RFD-R-D-UD
m
kg
ØD
mm
H1
mm
ØD3
mm
C
mm
125 158 146 0.6 200 192 0.7 98 8 127 40
160 197 151 0.8 250 196 1.2 123 8 162 40
200 241 154 1.2 300 197 1.7 158 8 202 40
250 295 159 1.6 350 202 2.2 198 8 252 40
315 364 166 2.5 450 219 3.6 248 8 318 40
400 450 176 3.7 580 229 5.3 313 8 403 40


RFD-R-A, RFD-R-D-A

Nominal size
RFD-R-A
ØD1
mm
RFD-R-A
H3
mm
RFD-R-A
A
mm
RFD-R-A
m
kg
RFD-R-D-A
ØD1
mm
RFD-R-D-A
H3
mm
RFD-R-D-A
A
mm
RFD-R-D-A
m
kg
H1
mm
□Q3
mm
H4
mm
ØD4
mm
ØD
mm
C
mm
Plenum box
125 158 255 170 2.8 200 284 204 2.9 8 216 195 125 98 50 AK-Uni-028
160 197 280 182 3.5 250 309 216 3.8 8 266 220 160 123 48 AK-Uni-029
200 241 310 194 4.2 300 339 228 4.6 8 290 250 200 158 50 AK-Uni-030
250 295 355 219 8.5 350 384 253 9.0 8 476 295 250 198 50 AK-Uni-031
315 364 395 244 11.6 450 444 289 12.5 8 567 345 315 248 48 AK-Uni-032
400 450 470 277 14.4 580 509 321 15.7 8 615 410 400 313 50 AK-Uni-033


RFD-R-D-N

Nominal size
ØD
mm
B1
mm
T1
mm
H3
mm
T2
mm
A
mm
C
mm
G
mm
m
kg
125 98 283 304 152 264 77 50 159 2.4
160 123 335 333 177 293 90 48 155 3.8
200 158 392 413 212 373 108 50 195 5.1
250 198 435 456 262 416 132 50 195 6.5
315 248 496 516 312 476 157 48 230 10.0
400 313 728 692 377 652 190 50 305 15.0


RFD-Q

Nominal size
RFD-Q-K
□Q1
mm
RFD-Q-K
Aeff

RFD-Q-D-K
□Q1
mm
RFD-Q-D-K
Aeff

ØD2
mm
125 198 0.0026 198 0.0034 120
160 198 0.0037 248 0.0060 155
200 248 0.0066 248 0.0092 195
250 298 0.0110 298 0.0150 245
315 398 0.0205 398 0.0265 310
400 498 0.0280 498 0.0355 395


RFD-R

Nominal size
RFD-R-K
ØD1
mm
RFD-R-K
Aeff

RFD-R-D-K
ØD1
mm
RFD-R-D-K
Aeff

ØD2
mm
125 158 0.0026 200 0.0034 120
160 197 0.0037 250 0.0060 155
200 241 0.0066 300 0.0092 195
250 295 0.0110 350 0.0150 245
315 364 0.0205 450 0.0265 310
400 450 0.0280 580 0.0355 395


Installation examples, Installation details, Commissioning, Basic information and nomenclature

  • Installation examples
  • Installation details
  • Commissioning
  • Basic information and nomenclature
Installation in continuous ceilings 00104475_0.


Installation and commissioning

  • Preferably for rooms with a clear height up to 4.0 m
  • Flush ceiling installation
  • RFD-*-D: Also for freely suspended installation
  • RFD-*-UO, RFD-*-UD: Clamping between ceiling tiles of up to 20 mm
  • Horizontal or vertical duct connection


These are only schematic diagrams to illustrate installation details.

Ceiling cut-out

Produktvariante
125
a
mm
125
Ød
mm
160
a
mm
160
Ød
mm
200
a
mm
200
Ød
mm
250
a
mm
250
Ød
mm
315
a
mm
315
Ød
mm
400
a
mm
400
Ød
mm
RFD-Q-K 180 140 235 175 295 215 370 265 465 330 595 415
RFD-Q-D-K 180 170 235 205 295 233 370 283 465 380 595 480
RFD-Q-A 140 175 215 265 330 415
RFD-Q-D-A 170 205 233 283 380 480
RFD-R-K 180 140 235 175 295 215 370 265 465 330 595 415
RFD-R-D-K 180 170 235 205 295 245 370 295 465 380 595 480
RFD-R-UO 125 160 200 250 315 400
RFD-R-D-UD 165 200 240 290 375 460
RFD-R-A 140 175 215 265 330 415
RFD-R-D-A 170 205 245 295 380 480


Volume flow rate balancing

When several diffusers are connected to just one volume flow controller, it may be necessary to balance the volume flow rates.

  • Ceiling diffusers with universal plenum box and damper blade (variant -M): The diffuser face can be removed to access the damper blade; the damper blade can then be set to any position between 0 and 90°
  • Ceiling diffusers with universal plenum box, damper blade and pressure tap (variant -MN): The diffuser face need not be removed since the damper blade can be set with two cords (white and green).

Volume flow rate measurement

Ceiling diffusers with universal plenum box, damper blade and pressure tap (variant -MN) allow for volume flow rate balancing even with the diffuser face in place.

  • Connect the measuring tube to the digital manometer
  • Read the effective pressure
  • Read the volume flow rate off the characteristic or calculate it
  • If necessary, adjust the damper blade position with the cords


A characteristic is included with each AK-Uni plenum box.

Principal dimensions

ØD [mm]

Outer diameter of the spigot

ØD₁ [mm]

Outer diameter of a circular diffuser face

ØD₂ [mm]

Diameter of a circular diffuser face style

ØD₃ [mm]

Diameter of a circular plenum box

□Q₁ [mm]

Outer diameter of a square diffuser face

□Q₂ [mm]

Dimensions of a square diffuser face style

□Q₃ [mm]

Dimensions of a square plenum box

H₁ [mm]

Distance (height) from the lower edge of the suspended ceiling to the lower edge of the diffuser face

H₂ [mm]

Height of a ceiling diffuser, from the lower edge of the suspended ceiling to the upper edge of the spigot

H₃ [mm]

Height of a ceiling diffuser with plenum box, from the lower edge of the suspended ceiling to the upper edge of the plenum box or of the spigot

A [mm]

Position of the spigot, defined by the distance of the spigot centre line to the lower edge of the suspended ceiling

C [mm]

Length of the spigot

m [kg]

Weight

Nomenclature

LWA [dB(A)]

A-weighted sound power level of air-regenerated noise

V [m³/h] and [l/s]

Volume flow rate

Δtz [K]

Supply air to room air temperature difference, i.e. supply air temperature minus room temperature

Δpt [Pa]

Total differential pressure

Aeff [m²]

Effective air discharge area


All sound power levels are based on 1 pW.

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For general question regarding products or services you can also call:
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