Type VSD35-3-AZ

Ventilation and extract ventilation combined in one casing

Slot diffusers with 35 mm nominal width, used as supply and extract air combination

  • Nominal length from 600 to 1200 mm, 3 slots
  • Volume flow rate range 8 – 40 l/s or 30 – 144 m³/h
  • Diffuser face made of extruded aluminium sections
  • For variable and constant volume flows
  • High induction results in a rapid reduction of the temperature difference and airflow velocity
  • Individually adjustable air control elements to meet individual local requirements


Optional equipment and accessories

  • Exposed diffuser face available in RAL CLASSIC colours
  • Damper blade for volume flow rate balancing, can be adjusted through the diffuser face
  • Acoustic lining that ensures very good transmission loss
  • Spring clip fixing
  • End angles, fixing brackets

VSD35-3-AZ 00181308_0

Black air control elements

  • Application
  • Description

Application

  • Type VSD35-3-AZ slot diffusers are used as supply and extract air combinations in comfort zones
  • Angled one-way air discharge for turbulent flow (mixed flow ventilation)
  • High induction results in a rapid reduction of the temperature difference and airflow velocity
  • For variable and constant volume flows
  • For supply air to room air temperature differences from –10 to +10 K
  • For room heights up to 4 m (lower edge of suspended ceiling)
  • For horizontal installation into walls and bulkheads

Special characteristics

  • Individually adjustable air control elements to meet individual local requirements
  • High induction results in a rapid reduction of the temperature difference and airflow velocity
  • Diffuser face has been optimised for maximum volume flow rate at low sound power levels
  • Suitable for continuous linear arrangement

Nominal sizes

  • LN: 600, 750, 900, 1050, 1200 mm

Variants

  • VSD35-3-AZ-...: supply and extract air combination without acoustic lining (cross talk reduction)
  • VSD35-3-AZ-...-ZT: supply and extract air combination with acoustic lining (cross talk reduction)
  • VSD35-3-AZ-...: Black air control elements
  • VSD35-3-AZ-.../WW: White air control elements


Plenum box and diffuser face fixing

  • AK: Plenum box with rigid fixing
  • AS: Plenum box with spring clip fixing

Parts and characteristics

  • Diffuser face with individually adjustable air control elements
  • Plenum box for horizontal duct connection
  • Spring clip fixing (facilitates installing the diffuser face) or screw fixing

Attachments

  • Damper blade for volume flow rate balancing
  • End angles

Accessories

  • Lip seal
  • Fixing brackets

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 from extruded aluminium sections
  • Air control elements made of plastic, UL 94, V-0, flame retardant
  • Plenum box and fixing brackets made of galvanised sheet steel
  • End angle made of aluminium
  • Lip seal made of rubber
  • Acoustic lining of the cross-talk attenuator is mineral wool
  • Diffuser face with anodised finish, E6-C-0, natural colour
  • P1: Powder-coated, RAL CLASSIC colour
  • Air control elements similar to RAL 9005, black
  • WW: Air control elements similar to RAL 9010, white


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

  • 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

Slot diffusers direct the air from air conditioning systems at an angle 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. 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 VSD35-3-AZ slot diffusers have adjustable air control elements. The supply air to room air temperature difference may range from –10 to +10 K.

A damper blade (optional) simplifies volume flow rate balancing for commissioning.

Type VSD35-3-AZ diffusers are space saving supply and extract air combinations.

Nominal length

600, 750, 900, 1050, 1200 mm

Number of slots

3

Minimum volume flow rate, with ΔtZ = –6 K 

8 – 15 l/s or 30 – 54 m³/h

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

25 – 40 l/s or 90 – 144 m³/h

Supply air to room air temperature difference

–10 to +10 K


Transmission loss – supply air

Nominal length Centre frequency fm [Hz]
Nominal length 125 250 500 1000 2000
Nominal length Dt
Nominal length dB

600, 750, 900, 1050, 1200

14

7

7

4

4


Transmission loss – extract air

Nominal length Centre frequency fm [Hz]
Nominal length 125 250 500 1000 2000
Nominal length Dt
Nominal length dB

600, 750, 900, 1050, 1200

14

7

7

4

4


Transmission loss – supply air

Nominal length Centre frequency fm [Hz]
Nominal length 125 250 500 1000 2000
Nominal length Dt
Nominal length dB

600, 750

16

13

14

16

25

900, 1050, 1200

18

12

14

21

26


Transmission loss – extract air

Nominal length Centre frequency fm [Hz]
Nominal length 125 250 500 1000 2000
Nominal length Dt
Nominal length dB

600, 750

15

11

11

15

22

900, 1050, 1200

17

11

13

19

25


Quick sizing tables provide a good overview of the volume flow rates and corresponding sound power levels and differential pressures.

The maximum volume flow rates apply to a sound power level of approx. 50 dB (A) with damper blade position 0°.

VSD35-3-AZ, sound power level and total differential pressure

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

600

8

30

6

3

15

9

5

17

26

13

24

600

15

54

19

9

31

31

16

34

85

43

40

600

25

90

54

26

45

86

45

47

237

120

54

600

30

108

77

37

50

124

65

52

341

173

59

750

10

37

7

4

21

12

8

23

28

19

31

750

20

72

28

15

38

44

31

40

107

74

47

750

25

90

44

24

44

68

48

46

167

116

53

750

30

108

64

35

48

98

70

51

241

167

57

900

12

44

9

6

23

14

10

26

37

28

29

900

20

72

24

15

36

37

27

39

97

74

44

900

30

108

55

33

46

82

60

50

217

167

55

900

35

126

74

45

51

112

82

54

296

228

60

1050

15

54

12

8

28

17

15

30

58

39

38

1050

25

90

34

22

40

48

41

44

161

110

51

1050

35

126

66

43

49

95

80

53

316

215

60

1050

40

144

86

56

52

124

104

56

413

281

63

1200

15

54

11

8

26

20

13

29

55

41

38

1200

30

108

44

30

44

79

52

47

218

165

56

1200

35

126

60

41

48

107

71

52

297

225

60

1200

40

144

79

54

51

140

92

55

388

293

63


VSD35-3-AZ-ZT, sound power level and total differential pressure

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

600

8

30

13

9

18

13

10

18

22

17

20

600

15

54

42

30

35

43

35

36

73

58

36

600

20

72

74

53

44

76

62

44

130

104

44

600

25

90

116

83

50

119

96

51

203

162

50

750

10

36

19

15

24

12

16

25

32

31

26

750

15

54

43

33

36

44

36

37

73

69

37

750

20

72

76

58

44

68

65

46

129

122

44

750

25

90

118

91

51

98

101

52

202

191

50

900

12

44

19

14

24

14

17

24

45

36

26

900

20

72

51

37

38

37

44

37

118

95

39

900

25

90

79

58

44

82

69

43

184

149

45

900

30

108

114

83

49

112

100

48

265

215

50

1050

15

54

27

21

30

17

31

31

65

56

32

1050

25

90

76

59

44

48

86

45

182

155

45

1050

30

108

110

84

49

95

124

50

261

223

50

1050

35

126

149

115

53

124

169

54

356

304

54

1200

15

54

28

21

30

20

26

29

65

54

31

1200

20

72

49

38

38

79

45

37

116

95

39

1200

30

108

111

85

49

107

102

48

261

215

49

1200

35

126

151

115

53

140

139

52

355

292

53


Slot diffusers with individually manually adjustable air control elements and an aesthetically shaped face section with three slots, for angled one-way air discharge. Supply and extract air combination. For wall and bulkhead installation.

Ready-to-install component which consists of the diffuser face with individually adjustable black or white air control elements, and of a plenum box with a side entry spigot and a side extract air spigot.

Spring clip fixing or rigid fixing to the plenum box

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

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

Transmission loss measured according to EN ISO 7235.

Special characteristics

  • Individually adjustable air control elements to meet individual local requirements
  • High induction results in a rapid reduction of the temperature difference and airflow velocity
  • Diffuser face has been optimised for maximum volume flow rate at low sound power levels
  • Suitable for continuous linear arrangement

Materials and surfaces

  • Diffuser face made from extruded aluminium sections
  • Air control elements made of plastic, UL 94, V-0, flame retardant
  • Plenum box and fixing brackets made of galvanised sheet steel
  • End angle made of aluminium
  • Lip seal made of rubber
  • Acoustic lining of the cross-talk attenuator is mineral wool
  • Diffuser face with anodised finish, E6-C-0, natural colour
  • P1: Powder-coated, RAL CLASSIC colour
  • Air control elements similar to RAL 9005, black
  • WW: Air control elements similar to RAL 9010, white


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

  • Nominal length: 600, 750, 900, 1050, 1200 mm
  • Number of slots: 3
  • Minimum volume flow rate: 8 – 15 l/s or 30 – 54 m³/h
  • Maximum volume flow rate, with LWA ≅ 50 dB(A): 25 – 40 l/s or 90 – 144 m³/h
  • Supply air to room air temperature difference: –10 to +10 K

Sizing data

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

Air-regenerated noise

  • LWA _______________________ [dB(A)]

This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme.

00135410_0

 Type
VSD35-3-AZ       Slot diffuser as supply and extract air combination

 Connection
       Plenum box
AK       With rigid fixing
AS       With spring clip fixing

 Acoustic lining for cross talk reduction (accessory)
       No entry: none
ZT       With

 Damper blade for volume flow rate balancing
       No entry: none
M       With

 Accessories
       No entry: none
L       With lip seal

 

 Nominal size [mm]
600
750
900
1050
1200

 End pieces
       No entry: none
C2       Both ends with factory fitted end angles

 Fixing (accessory)
       No entry: none
W00       Fixing brackets for fixing the diffuser to the wall (supplied separately)

 Exposed surface
       No entry: anodised, E6-C-0, natural colour
P1       Powder-coated, specify RAL CLASSIC colour

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

 Colour of air control elements
       No entry: similar to RAL 9005, black
WW       Similar to RAL 9010, white

Order example: VSD35-3-AZ-AS-ZT-M-L/900/C2/W00/P1-RAL 9010/WW

Connection

With spring clip fixing

Acoustic lining (accessory)

With

Damper blade for volume flow rate balancing

With

Accessories

Lip seal

Nominal size

900 mm

End pieces

End angles

Fixing

Fixing brackets

Exposed surface

RAL 9010, pure white, gloss level 50 %

Colour of air control elements

White


 

Variants, Attachments, Dimensions and weight, Product details

  • Variants
  • Attachments
  • Dimensions and weight
  • Product details

VSD35-3-AZ

Nominal length
mm
LN
L1
mm
600 600
750 750
900 900
1050 1050
1200 1200


VSD35-3-AZ

Variant
P
mm
VSD35-3-AZ 109


VSD35-3-AZ

Nominal length
mm
LN
L1
mm
L3
mm
L4
mm
ØD
mm
C
mm
E
mm
m
kg
600 600 595 622 78 40 150 3.9
750 750 745 772 78 40 150 4.8
900 900 895 922 78 40 150 5.6
1050 1050 1045 1072 78 40 150 6.5
1200 1200 1195 1222 78 40 150 7.4


VSD35-3-AZ-ZT

Nominal length
mm
LN
L1
mm
L3
mm
L4
mm
T3
mm
ØD
mm
C
mm
E
mm
m
kg
600 600 595 622 270 78 40 464 4.9
750 750 745 772 270 78 40 464 5.8
900 900 895 922 290 78 40 664 7.2
1050 1050 1045 1072 290 78 40 664 8.1
1200 1200 1195 1222 290 78 40 664 8.9


VSD35-3-AZ 00155766_0


Profiles

VSD35-3-AZ

Nominal length
mm
LN
Aeff

600 0.0039
750 0.0049
900 0.0058
1050 0.0068
1200 0.0078

Aeff: One-way angled air discharge (supply air)


Installation details, Commissioning, Basic information and nomenclature

  • Installation details
  • Commissioning
  • Basic information and nomenclature

Installation and commissioning

  • Preferably for rooms with a clear height up to 4.0 m
  • For wall and bulkhead installation
  • Horizontal duct connection
  • If necessary, carry out volume flow rate balancing with the damper blade


These are only schematic diagrams to illustrate installation details.

Installation opening

Nominal length
mm
LN
l
mm
h
mm
600 612 98
750 762 98
900 912 98
1050 1062 98
1200 1212 98


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.

  • Slot diffusers with plenum box and damper blade (variant -M): The damper blade can be adjusted even after the diffuser face has been installed.

Principal dimensions

ØD [mm]

Outer diameter of the spigot

L₁ [mm]

Length of diffuser without end pieces

L₃ [mm]

Length of plenum box

P [mm]

Width of diffuser face – with extended border, if any

B₃ [mm]

Width of plenum box

H₃ [mm]

Height of slot diffuser with plenum box, from the lower edge of the suspended ceiling to the upper edge of the plenum box

Y [mm]

Neck extension – The neck length results from a fixed length plus the neck extension

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

fm [Hz]

Octave band centre frequency

LWA [dB(A)]

Sound power level of the air-regenerated noise

V [m³/h] and [l/s]

Volume flow rate

Δpt [Pa]

Total differential pressure


All sound power levels are based on 1 pW.

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