Type QLW-AZ

Supply and extract air combination for installation into walls and bulkheads, one-way air discharge, for comfort zones

Displacement flow diffusers with supply and extract air functions combined in one casing

  • Nominal lengths 600 – 1200 mm
  • Volume flow rate range 12 – 45 l/s or 43 – 162 m³/h
  • Variant with cross-talk attenuator ensures very good transmission loss
  • Perforated plate, square pitch
  • Circular duct connections
  • Horizontal duct connection


Optional equipment and accessories

  • Exposed surface in RAL CLASSIC colours
  • Damper blade for volume flow rate balancing
  • Cross-talk attenuator
  • Fixing brackets

QLW-AZ 00132212_0


  • Application
  • Description

Application

  • Type QLW-AZ displacement flow diffusers are supply and extract air combinations for use in comfort zones
  • Attractive design element for building owners and architects with demanding aesthetic requirements
  • For installation into walls or bulkheads, either individually or several diffusers arranged in a row
  • Low-velocity airflow, causing only low levels of induction and resulting in low-turbulence displacement ventilation.
  • Excellent air quality in the occupied zone
  • For variable and constant volume flows
  • For supply air to room air temperature differences from –6 to –1 K

Special characteristics

  • One-way air discharge
  • Diffuser face screw-fixed to casing, hence easy to remove
  • Horizontal duct connection

Nominal sizes

  • L: 600, 750, 900, 1050, 1200 mm

Variants

  • QLW-AZ-ZT: Displacement flow diffuser with cross-talk attenuator

Parts and characteristics

  • Casing
  • Removable diffuser face made of perforated sheet metal
  • Equalising element

Attachments

  • Damper blade for volume flow rate balancing

Accessories

  • Lip seal
  • Wall fixing bracket

Useful additions

  • Retrofit cross-talk attenuator

Construction features

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

Materials and surfaces

  • The casing of the displacement flow diffuser, and the cross-talk attenuator casing, diffuser face and equalising element are made of galvanised sheet steel
  • Lip seal made of rubber
  • Acoustic lining of the cross-talk attenuator is mineral wool
  • Exposed diffuser face powder-coated RAL 9010, pure white
  • P1: Powder-coated, RAL CLASSIC colour


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

Technical information

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

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

Functional description

Displacement flow diffusers discharge the air from air conditioning systems with a low velocity and near the floor. The low-turbulence airflow moves along the wall and towards the floor, where it eventually covers the entire floor area. The convection from people and other heat sources causes the fresh air from the pool to rise and create comfortable conditions in the occupied zone.

Displacement ventilation is characterised by low airflow velocities and low turbulence. The air quality in the occupied zone is very high.

Displacement ventilation with air discharge near the floor is suitable only for cooling. The maximum supply air to room air temperature difference is –6 K.

Type QLW-AZ displacement flow diffusers include an equalising element which distributes the supply air flow equally across the entire diffuser area. The perforated sheet metal diffuser face helps to equalise the airflow further. One-way air discharge.

The upper part of the diffuser face is used for extract air. This solution is ideal insofar as the extract air has to be removed above the occupied zone.

Nominal sizes

600, 750, 900, 1050, 1200 mm

Minimum volume flow rate, at approx. 0.2 m/s

12 – 25 l/s or 43 – 90 m³/h

Maximum volume flow rate, at approx. 0.4 m/s

25 – 45 l/s or 90 – 162 m³/h

Supply air to room air temperature difference

–6 to –1 K


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

QLW-AZ, sound power level and total differential pressure

Nominal size V v0 Damper blade position
Nominal size V v0 45° 90°
Nominal size V v0 Δpt Δpt LWA Δpt Δpt LWA Δpt Δpt LWA
Nominal size l/s m³/h m/s Pa dB(A) Pa dB(A) Pa dB(A)

600

12

43

0.18

7

<3

<15

9

3

<15

16

10

17

600

15

54

0.23

11

3

19

13

5

21

26

15

24

600

20

72

0.30

19

5

31

24

10

32

46

27

34

600

25

90

0.38

30

7

40

37

15

41

72

42

42

750

15

54

0.18

8

<3

16

10

6

19

24

16

21

750

20

72

0.24

14

4

26

18

10

29

42

28

31

750

25

90

0.30

21

6

34

28

16

37

65

43

39

750

30

108

0.36

31

9

41

41

24

43

94

63

45

900

20

72

0.20

11

4

24

16

9

27

38

28

29

900

25

90

0.25

17

6

31

25

15

35

59

44

36

900

30

108

0.30

24

9

37

36

21

41

85

63

43

900

35

126

0.35

33

12

42

49

29

46

116

86

48

1050

20

72

0.17

10

4

23

16

10

28

37

29

31

1050

25

90

0.22

15

6

30

25

15

36

58

45

38

1050

30

108

0.26

22

8

36

36

22

41

84

65

43

1050

40

144

0.35

39

15

45

64

39

51

149

116

52

1200

25

90

0.19

13

5

29

20

15

34

58

43

39

1200

30

108

0.23

19

8

35

29

22

40

84

61

44

1200

35

126

0.27

25

10

39

40

30

45

114

83

48

1200

45

162

0.34

42

17

46

66

49

52

189

138

55

① Supply air

② Extract air


QLW-AZ-ZT, sound power level and total differential pressure

Nominal size V v0 Damper blade position
Nominal size V v0 45° 90°
Nominal size V v0 Δpt Δpt LWA Δpt Δpt LWA Δpt Δpt LWA
Nominal size l/s m³/h m/s Pa dB(A) Pa dB(A) Pa dB(A)

600

7

25

0.11

5

3

<15

5

4

<15

7

6

<15

600

10

36

0.15

10

7

15

10

8

17

14

11

19

600

15

54

0.23

22

15

28

22

17

30

31

26

31

600

20

72

0.30

40

27

38

40

31

39

54

46

40

750

10

36

0.12

9

6

15

9

7

15

13

10

20

750

15

54

0.18

20

15

28

20

15

28

29

22

32

750

20

72

0.24

35

26

36

35

27

37

51

39

40

750

25

90

0.30

55

41

43

55

42

44

79

61

47

900

15

54

0.15

18

14

26

19

16

28

26

16

30

900

20

72

0.20

32

25

35

33

29

37

47

29

38

900

25

90

0.25

50

40

41

52

46

43

73

46

44

900

30

108

0.30

73

57

46

75

66

49

106

66

49

1050

20

72

0.17

32

25

35

33

31

38

47

46

40

1050

25

90

0.22

50

39

42

52

49

44

74

72

46

1050

30

108

0.26

73

56

47

74

70

50

106

103

51

1050

35

126

0.30

99

77

52

101

95

54

145

141

55

1200

25

90

0.19

50

37

42

51

46

43

76

68

45

1200

30

108

0.23

73

54

47

74

66

48

109

98

50

1200

35

126

0.27

99

73

51

101

90

53

149

134

55

1200

40

144

0.30

129

96

55

132

117

57

194

175

59

① Supply air

② Extract air


Displacement flow diffusers as supply and extract air combinations, suitable for comfort zones with special demands on architecture and design.

With one-way air discharge for low-turbulence displacement ventilation. For wall and bulkhead installation.

Ready-to-install component which consists of a casing with horizontal spigots, an equalising element, and a perforated sheet metal diffuser face.

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

  • One-way air discharge
  • Diffuser face screw-fixed to casing, hence easy to remove
  • Horizontal duct connection

Materials and surfaces

  • The casing of the displacement flow diffuser, and the cross-talk attenuator casing, diffuser face and equalising element are made of galvanised sheet steel
  • Lip seal made of rubber
  • Acoustic lining of the cross-talk attenuator is mineral wool
  • Exposed diffuser face powder-coated RAL 9010, pure white
  • P1: Powder-coated, RAL CLASSIC colour


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 sizes: 600, 750, 900, 1050, 1200 mm
  • Minimum volume flow rate, at approx. 0.2 m/s: 12 – 25 l/s or 43 – 90 m³/h
  • Maximum volume flow rate, at approx. 0.4 m/s: 25 – 45 l/s or 90 – 162 m³/h
  • Supply air to room air temperature difference: –6 to –1 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.

Order example: QLW-AZ–ZT/750/P1-RAL 9016

Cross-talk attenuator

With

Damper blade for volume flow rate balancing

Without

Lip seal

Without

Nominal size

750 mm

Exposed surface

RAL 9016, traffic white, gloss level 70 %


 

Variants, Dimensions and weight

  • Variants
  • Dimensions and weight

The nominal size (nominal width × nominal height) is equal to the discharge opening.

QLW-AZ

Nominal length
mm
LN
QLW-AZ
m
kg
QLW-AZ-ZT
m
kg
B1
mm
B2
mm
600 5.5 7.5 640 600
750 6.5 9.5 790 750
900 7.5 11.0 940 900
1050 8.5 12.5 1090 1050
1200 10.0 14.0 1240 1200


Installation details, Basic information and nomenclature

  • Installation details
  • Basic information and nomenclature
Installation opening 00221147_0


Installation and commissioning

  • If necessary, carry out volume flow rate balancing with the damper blade


These are only schematic diagrams to illustrate installation details.


Principal dimensions

B₁ [mm]

Width of diffuser face

B₄ [mm]

Width of a rectangular spigot

ØD [mm]

Outer diameter of the spigot

ØD₁ [mm]

Casing diameter

H₁ [mm]

Height of diffuser face

T₁ [mm]

Casing depth

T₄ [mm]

Depth of a rectangular 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

v0 [m/s]

Theoretical airflow velocity across the diffuser area, at a distance of 0 m from the diffuser face

Lnz [m]

Near zone of the displacement flow diffuser, where the comfort criteria may not be achieved

The near zone is at least 0.5 m, independent of the airflow velocity

At distance Lnz the airflow velocity is 0.2 m/s max., measured 0.1 m above the floor

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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Contact

Thank you for your message!

Visual contact Visual contact

Your message is send and will be processed shortly.
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