Type FD

For comfort zones, with fixed air control blades

Circular and square ceiling swirl diffusers that create high induction levels, for high room air change rates

  • Nominal sizes 300, 400, 500, 600, 625
  • Volume flow rate range 9 – 235 l/s or 31 – 846 m³/h
  • Diffuser face made of galvanised sheet steel, powder-coated
  • For supply and extract air
  • For variable and constant volume flows
  • For all types of ceiling systems, and with an extended border also suitable for 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
  • Plenum box with cord-operated damper blade and pressure tap

FD-Q 00133166_0


  • Application
  • Description

Application

  • Type FD 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 also suitable for freely suspended installation (supply air variant)

Special characteristics

  • High induction results in a rapid reduction of the supply air to room air temperature difference and airflow velocity
  • For all types of ceiling systems, and with an extended border also suitable for freely suspended installation
  • 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

  • 300, 400, 500, 600, 625

Variants

  • FD-Q: Square diffuser face
  • FD-R: Circular diffuser face
  • FD-*-Z: Supply air
  • FD-*-A: Extract air


Connection

  • H: Horizontal duct connection
  • V: Vertical duct connection

Parts and characteristics

  • Circular or square diffuser face
  • Diffuser face with radially arranged fixed air control blades
  • Plenum box for supply air, with an optimised equalising element that ensures a uniform airflow through 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)

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

  • Diffuser face made of galvanised sheet steel
  • V, H: Plenum box and cross bar made of galvanised sheet steel
  • X: Plenum box made of plastic and galvanised sheet steel
  • 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

Teknisk 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 FD 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 FD diffusers may also be used for extract air.

Nominal sizes

300, 400, 500, 600, 625 mm

Minimum volume flow rate, with ΔtZ = –6 K 

9 – 28 l/s or 31 – 102 m³/h

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

70 – 235 l/s or 252 – 846 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.

FD-*-Z-H (supply air), 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)

300

9

31

1

<15

1

<15

2

<15

300

35

126

13

28

17

27

27

27

300

55

198

31

39

41

40

67

39

300

80

288

67

50

87

54

142

54

400

16

59

1

<15

1

<15

2

<15

400

60

216

10

24

14

25

27

26

400

105

378

32

39

42

40

83

44

400

145

522

60

50

81

53

158

57

500

24

85

1

<15

2

<15

4

<15

500

80

288

12

24

19

26

43

29

500

135

486

33

39

53

41

123

45

500

185

666

62

50

99

54

231

58

600, 625

28

102

1

<15

1

<15

3

<15

600, 625

95

342

10

25

15

25

29

24

600, 625

160

576

28

39

41

40

81

39

600, 625

225

810

55

50

81

52

160

53


FD-*-Z-V (supply air), 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)

300

9

31

1

<15

1

<15

2

<15

300

30

108

9

25

11

25

19

25

300

50

180

26

38

32

38

54

38

300

70

252

51

49

62

49

106

49

400

16

59

1

<15

1

<15

2

<15

400

60

216

10

24

13

23

23

24

400

105

378

31

39

40

39

72

42

400

145

522

60

50

77

51

138

55

500

24

85

1

<15

1

<15

4

<15

500

80

288

11

24

14

23

44

29

500

130

468

28

38

36

39

117

44

500

180

648

54

50

70

53

223

56

600, 625

28

102

1

<15

1

<15

2

<15

600, 625

95

342

9

25

12

24

28

27

600, 625

160

576

26

40

35

41

78

44

600, 625

220

792

50

51

67

55

148

57


Ceiling swirl diffusers with square or circular diffuser face. Supply air and extract air variants for comfort 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 casing, diffuser face, spigot, and a cross bar to which the diffuser face is fixed.

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

  • High induction results in a rapid reduction of the supply air to room air temperature difference and airflow velocity
  • For all types of ceiling systems, and with an extended border also suitable for freely suspended installation
  • 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

  • Diffuser face made of galvanised sheet steel
  • V, H: Plenum box and cross bar made of galvanised sheet steel
  • X: Plenum box made of plastic and galvanised sheet steel
  • Lip seal made of rubber
  • Diffuser face powder-coated RAL 9010, pure white
  • P1: Powder-coated, RAL CLASSIC colour

Technical data

  • Nominal sizes: 300, 400, 500, 600, 625 mm
  • Minimum volume flow rate, with ΔtZ = –6 K: 9 – 28 l/s or 31 – 102 m³/h
  • Maximum volume flow rate, with LWA ≅ 50 dB(A): 70 – 235 l/s or 252 – 846 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)]

00133903_0

 Type
FD       Swirl diffuser

 Construction style
R       Circular
Q       Square

 System
Z       Supply air
A       Extract air

 Connection
H       Horizontal
V       Vertical

 

 Damper blade for volume flow rate balancing
       No entry: without damper blade
M       With damper blade
MN       With cords and pressure tap (only for connection type H)

 Accessories
       No entry: without accessories
L       With lip seal

 Nominal size [mm]
300
400
500
600
625

 Exposed surface
       No entry: powder-coated RAL 9010, pure white
P1       Powder-coated, specify RAL CLASSIC colour

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

Order example: FD–Q–Z–H–MN/500/P1–RAL 9016

Construction style

Square

System

Supply air

Connection

Horizontal

Damper blade for volume flow rate balancing

With cords and pressure tap

Accessories

Without accessories

Nominal size

500

Exposed surface

RAL 9016, traffic white, gloss level 70 %


 

Variants, Dimensions and weight, Product details

  • Variants
  • Dimensions and weight
  • Product details

FD-Q-*-H

Designed for high comfort

Together with renowned designers and architects we have developed ceiling, wall, staircase and floor diffusers and grilles that are not only aesthetic design elements, but also meet demanding ventilation and acoustic requirements.

Variant

  • Ceiling swirl diffuser with square diffuser face
  • With plenum box for horizontal duct connection

Nominal sizes

  • 300, 400, 500, 600, 625

Parts and characteristics

  • Square diffuser face
  • Plenum box for horizontal duct connection
  • Square opening to accommodate the diffuser face
  • Equalising element that ensures a uniform airflow through the diffuser face (supply air variant)
  • 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)

FD-Q-*-V

Designed for high comfort

Together with renowned designers and architects we have developed ceiling, wall, staircase and floor diffusers and grilles that are not only aesthetic design elements, but also meet demanding ventilation and acoustic requirements.

Variant

  • Ceiling swirl diffuser with square diffuser face
  • With plenum box for vertical duct connection

Nominal sizes

  • 300, 400, 500, 600, 625

Parts and characteristics

  • Square diffuser face
  • Plenum box for vertical duct connection
  • Circular opening to accommodate the diffuser face
  • Equalising element that ensures a uniform airflow through the diffuser face (supply air variant)
  • Simple installation of the diffuser face due to central fixing screw with decorative cap
  • 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)

FD-R-*-H

Designed for high comfort

Together with renowned designers and architects we have developed ceiling, wall, staircase and floor diffusers and grilles that are not only aesthetic design elements, but also meet demanding ventilation and acoustic requirements.

Variant

  • Ceiling swirl diffuser with circular diffuser face
  • With plenum box for horizontal duct connection

Nominal sizes

  • 300, 400, 500, 600, 625

Parts and characteristics

  • Circular diffuser face
  • Plenum box for horizontal duct connection
  • Circular opening to accommodate the diffuser face
  • Equalising element that ensures a uniform airflow through the diffuser face (supply air variant)
  • 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)

FD-R-*-V

Designed for high comfort

Together with renowned designers and architects we have developed ceiling, wall, staircase and floor diffusers and grilles that are not only aesthetic design elements, but also meet demanding ventilation and acoustic requirements.

Variant

  • Ceiling swirl diffuser with circular diffuser face
  • With plenum box for vertical duct connection

Nominal sizes

  • 300, 400, 500, 600, 625

Parts and characteristics

  • Circular diffuser face
  • Plenum box for vertical duct connection
  • Circular opening to accommodate the diffuser face
  • Equalising element that ensures a uniform airflow through the diffuser face (supply air variant)
  • Simple installation of the diffuser face due to central fixing screw with decorative cap
  • 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)

FD-Q-*-H

Nominal size
□Q1
mm
H1
mm
□Q3
mm
H3
mm
ØD
mm
A
mm
C
mm
Plenum box
m
kg
300 298 8 290 250 158 139 50 AK-Uni-001 4.0
400 398 8 372 295 198 164 50 AK-Uni-002 6.2
500 498 8 476 295 198 164 50 AK-Uni-003 8.5
600 598 8 567 345 248 199 48 AK-Uni-004 11.6
625 623 8 567 345 248 199 48 AK-Uni-004 11.9

Weights apply to the supply air variant


FD-Q-*-V

Nominal size
□Q1
mm
H1
mm
ØD3
mm
H3
mm
ØD
mm
C
mm
m
kg
300 298 8 275 200 158 50 3.0
400 398 8 364 200 198 50 4.7
500 498 8 462 200 198 50 6.7
600 598 8 559 200 248 48 8.9
625 623 8 559 200 248 48 9.2

Weights apply to the supply air variant


FD-R-*-H

Nominal size
ØD1
mm
H1
mm
□Q3
mm
H3
mm
ØD4
mm
H4
mm
ØD
mm
A
mm
C
mm
Plenum box
m
kg
300 300 8 290 285 278 250 158 174 50 AK-Uni-013 4.2
400 400 8 372 330 362 295 198 199 50 AK-Uni-014 6.5
500 500 8 476 330 460 295 198 199 50 AK-Uni-015 9.0
600 600 8 567 380 557 345 248 234 48 AK-Uni-016 12.3
625 625 8 567 380 557 345 248 234 48 AK-Uni-016 12.5

Weights apply to the supply air variant


FD-R-*-V

Nominal size
ØD1
mm
H1
mm
ØD3
mm
H3
mm
ØD
mm
C
mm
m
kg
300 300 8 275 200 158 50 2.8
400 400 8 364 200 198 50 4.4
500 500 8 462 200 198 50 6.3
600 600 8 559 200 248 48 8.5
625 625 8 559 200 248 48 8.7

Weights apply to the supply air variant


FD-Q

Nominal size
□Q1
mm
ØD2
mm
Aeff

300 298 250 0.0088
400 398 350 0.0180
500 498 450 0.0251
600 598 538 0.0295
625 623 538 0.0295


FD-R

Nominal size
ØD1
mm
ØD2
mm
Aeff

300 300 250 0.0088
400 400 350 0.0180
500 500 450 0.0251
600 600 538 0.0295
625 625 538 0.0295


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

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

Installation and commissioning

  • Preferably for rooms with a clear height up to 4.0 m
  • Flush ceiling installation
  • Freely suspended installation only with an extended border (supply air variant)
  • Horizontal or vertical duct connection
  • If necessary, carry out volume flow rate balancing with the damper blade


These are only schematic diagrams to illustrate installation details.

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.

Nedladdningar

  • produkt information

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