Type DLQL

For horizontal one-way to four-way air discharge, for comfort zones, with fixed baffle element

Square ceiling diffusers

  • Nominal sizes 250, 300, 400, 500, 600
  • Volume flow rate range 6 – 285 l/s or 22 – 1026 m³/h
  • Square diffuser face
  • 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
  • Perforated diffuser face with special baffle element for horizontal air discharge and high induction levels


Optional equipment and accessories

  • Exposed diffuser face available in RAL CLASSIC colours
  • Horizontal or vertical duct connection
  • Blanking plates for adjusting the discharge direction
  • Plenum box with damper blade

DLQL-P 00132971_0


  • Application
  • Description

Application

  • Type DLQL ceiling diffusers are used as supply air or extract air diffusers for comfort zones
  • Perfect integration with suspended perforated sheet metal ceilings
  • Horizontal one-way to four-way supply air discharge for mixed flow ventilation
  • High induction results in a rapid reduction of the temperature difference and airflow velocity (supply air variant)
  • 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 all types of ceiling systems

Special characteristics

  • Horizontal one-way to four-way supply air discharge
  • Perforated diffuser face made of galvanised sheet steel
  • For all types of ceiling systems
  • Horizontal or vertical duct connection

Nominal sizes

Ceiling tile

  • 248, 298, 398, 498, 598, 623 (intermediate sizes 249 to 622, in increments of 1 mm)


Air terminal device

  • 250, 300, 400, 500, 600

Variants

  • DLQL-P: Grid ceilings and continuous plasterboard ceilings
  • DLQL-T: T-bar ceilings
  • DLQL-*-Z: Supply air
  • DLQL-*-A: Extract air


Connection

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

Parts and characteristics

  • Perforated square diffuser face with special baffle element
  • Simple installation of the diffuser face due to central fixing screw with decorative cap (variant -P)

Attachments

  • M: Damper blade for volume flow rate balancing with horizontal connection

Accessories

  • Lip seal

Useful additions

  • Blanking plates

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

  • Perforated diffuser face made of galvanised sheet steel
  • Casing, damper blade and plenum box made of galvanised sheet steel
  • Baffle element made of acoustic fleece
  • Lip seal made of rubber
  • Casing powder-coated RAL 9005, jet black
  • Diffuser face dip 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 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 DLQL ceiling diffusers are fitted with a special baffle element that creates a horizontal air discharge and high induction levels. Horizontal air discharge is one-way to four-way. The supply air to room air temperature difference may range from –10 to +10 K.

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

Nominal sizes – ceiling tile

248, 298, 398, 498, 593, 598, 618, 623 mm

Nominal sizes – diffuser

250, 300, 400, 500, 600 mm

Minimum volume flow rate

6 – 145 l/s or 22 – 522 m³/h

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

275 – 285 l/s or 990 – 1026 m³/h

Supply air to room air temperature difference

–10 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) (DLQL-*-Z-H: with damper blade position 0°).

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

DLQL-*-Z-H with one-way air discharge (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)

250

6

22

3

<15

3

<15

6

<15

250

15

54

20

22

22

22

40

22

250

20

72

35

31

39

31

70

31

250

30

108

79

49

87

49

158

49

300

10

36

5

<15

6

<15

11

<15

300

20

72

22

30

24

30

43

31

300

30

108

49

42

54

42

98

43

300

40

144

87

52

95

52

173

53

400

15

54

5

<15

5

<15

9

<15

400

30

108

19

28

21

29

38

30

400

45

162

43

42

47

43

85

44

400

55

198

64

49

70

50

127

51

500

25

90

7

<15

8

<15

14

<15

500

40

144

17

28

19

29

35

29

500

55

198

33

42

36

43

66

43

500

70

252

54

50

59

51

107

51

600

35

126

5

<15

6

<15

11

<15

600

60

216

16

28

17

28

32

28

600

85

306

32

41

35

41

63

41

600

110

396

53

50

58

50

106

50


DLQL-*-Z-H with two-way air discharge (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)

250

15

54

8

17

9

17

16

17

250

25

90

22

30

24

30

44

30

250

35

126

43

39

48

39

87

39

250

50

180

89

51

97

51

177

51

300

20

72

9

18

10

18

18

19

300

30

108

20

29

22

29

40

30

300

40

144

36

38

39

38

72

39

300

55

198

68

50

75

50

136

51

400

35

126

10

18

11

19

20

20

400

50

180

20

30

23

31

41

32

400

70

252

40

42

44

43

80

44

400

85

306

59

49

65

50

118

51

500

50

180

10

20

11

21

20

21

500

70

252

20

32

22

33

39

33

500

95

342

36

43

40

44

72

44

500

115

414

53

50

58

51

106

51

600

75

270

9

16

10

16

19

16

600

105

378

19

31

20

31

37

31

600

140

504

33

42

36

42

66

42

600

175

630

52

50

57

50

103

50


DLQL-*-Z-H with three-way air discharge (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)

250

20

72

9

20

10

20

18

20

250

35

126

27

34

30

34

54

34

250

50

180

55

45

61

45

110

45

250

60

216

80

52

87

52

159

52

300

30

108

13

23

14

23

26

24

300

40

144

23

32

25

32

46

33

300

50

180

36

40

40

40

72

41

300

65

234

61

49

67

49

122

50

400

50

180

12

21

13

22

24

23

400

70

252

23

32

26

33

47

34

400

90

324

39

42

43

43

77

44

400

110

396

58

50

64

51

115

52

500

75

270

13

22

14

23

26

23

500

100

360

23

35

25

36

46

36

500

125

450

36

43

39

44

72

44

500

150

540

52

50

57

51

103

51

600

110

396

12

19

13

19

23

19

600

150

540

22

33

24

33

43

33

600

190

684

35

42

38

42

69

42

600

235

846

53

50

58

50

106

50


DLQL-*-Z-H with four-way air discharge (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)

250

25

90

10

23

11

22

17

22

250

35

126

19

30

21

30

34

30

250

50

180

39

40

43

41

69

40

250

65

234

66

49

72

49

116

49

300

35

126

14

23

16

24

28

25

300

45

162

23

31

26

32

46

32

300

60

216

41

41

46

41

81

41

300

75

270

64

50

72

49

127

49

400

65

234

15

23

19

25

35

26

400

75

270

20

28

25

30

47

31

400

95

342

32

37

40

38

75

39

400

135

486

64

50

80

51

151

51

500

100

360

18

27

20

27

37

28

500

130

468

30

38

33

37

62

38

500

160

576

46

46

50

45

94

46

500

180

648

58

50

63

50

118

50

600

145

522

15

25

17

25

30

25

600

185

666

24

34

28

34

49

34

600

230

828

38

43

44

43

75

43

600

275

990

54

50

63

50

107

49


DLQL-*-Z-V with one-way air discharge (supply air), sound power level and total differential pressure

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

250

6

22

5

<15

250

15

54

34

34

250

20

72

60

43

250

25

90

94

50

300

10

36

6

15

300

20

72

24

33

300

30

108

53

46

300

35

126

72

51

400

15

54

5

<15

400

30

108

20

32

400

45

162

45

45

400

50

180

56

49

500

25

90

6

19

500

40

144

15

30

500

55

198

28

40

500

75

270

52

51

600

35

126

5

19

600

60

216

15

32

600

85

306

30

43

600

100

360

42

50


DLQL-*-Z-V with two-way air discharge (supply air), sound power level and total differential pressure

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

250

15

54

10

20

250

25

90

29

35

250

35

126

56

45

250

40

144

73

50

300

20

72

8

16

300

30

108

18

31

300

40

144

32

41

300

50

180

50

49

400

35

126

9

18

400

50

180

18

32

400

70

252

35

44

400

80

288

45

49

500

50

180

8

20

500

70

252

15

33

500

95

342

28

44

500

115

414

41

51

600

75

270

8

20

600

105

378

15

33

600

130

468

24

41

600

165

594

38

50


DLQL-*-Z-V with three-way air discharge (supply air), sound power level and total differential pressure

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

250

20

72

9

19

250

35

126

27

36

250

50

180

55

47

250

60

216

80

53

300

30

108

11

20

300

40

144

19

31

300

50

180

29

40

300

65

234

50

49

400

50

180

9

21

400

70

252

17

33

400

90

324

29

43

400

110

396

43

50

500

75

270

9

20

500

100

360

16

35

500

125

450

25

44

500

150

540

36

50

600

110

396

8

21

600

150

540

15

33

600

190

684

24

42

600

230

828

35

51


DLQL-*-Z-V with four-way air discharge (supply air), sound power level and total differential pressure

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

250

25

90

9

18

250

35

126

17

29

250

50

180

35

41

250

65

234

59

50

300

35

126

9

<15

300

50

180

17

30

300

65

234

29

41

300

85

306

50

51

400

65

234

9

19

400

85

306

16

32

400

110

396

27

42

400

135

486

40

49

500

100

360

11

26

500

125

450

17

37

500

150

540

25

45

500

170

612

32

50

600

145

522

8

20

600

190

684

14

33

600

235

846

22

42

600

285

1026

32

50


Ceiling diffusers with perforated square diffuser face. Supply air and extract air variants for comfort zones. Diffuser face with baffle element for horizontal one-way to four-way supply air discharge. For flush installation into all kinds of suspended grid or continuous plasterboard ceilings.

Ready-to-install component which consists of the diffuser face with baffle element (only for supply air), and either a casing with top entry spigot or a plenum box with side entry spigot.

Perforated diffuser face suitable for central screw fixing (variant -P).

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

  • Horizontal one-way to four-way supply air discharge
  • Perforated diffuser face made of galvanised sheet steel
  • For all types of ceiling systems
  • Horizontal or vertical duct connection

Materials and surfaces

  • Perforated diffuser face made of galvanised sheet steel
  • Casing, damper blade and plenum box made of galvanised sheet steel
  • Baffle element made of acoustic fleece
  • Lip seal made of rubber
  • Casing powder-coated RAL 9005, jet black
  • Diffuser face dip coated RAL 9010, pure white
  • P1: Powder-coated, RAL CLASSIC colour

Technical data

  • Nominal sizes – ceiling tile: 248, 298, 398, 498, 593, 598, 618, 623 mm
  • Nominal sizes – diffuser: 250, 300, 400, 500, 600 mm
  • Minimum volume flow rate: 6 – 145 l/s or 22 – 522 m³/h
  • Maximum volume flow rate, with LWA ≅ 50 dB(A): 275 – 285 l/s or 990 – 1026 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)]

00135393_0

 Type
DLQL       Ceiling diffuser

 Ceiling system
P       Grid or plasterboard ceiling
T       T-bar ceiling

 System
Z       Supply air
A       Extract air

 Connection
H       Horizontal
V       Vertical

 Damper blade for volume flow rate balancing
       No entry: none
M       With (only for connection type H)

 Accessories
       No entry: none
L       With lip seal

 

 Nominal size [mm]
250
300
400
500
600

  Size of diffuser face plate [mm]
       DLQL-P
       No entry: size of diffuser face plate = nominal size – 2 mm
598       For grid size 600
623       For grid size 625
...       Other dimensions, 623 mm max.
       DLQL-T
593       For T-bar ceilings, grid size 600
618       For T-bar ceilings, grid size 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: DLQL-T-Z-H-M-L/600×593

Ceiling system

T-bar ceiling

System

Supply air

Connection

Horizontal

Damper blade for volume flow rate balancing

With

Accessories

With lip seal

Nominal size

600

Size of diffuser face plate

593

Exposed surface

RAL 9010, pure white, gloss level 50 %


 

Variants, Dimensions and weight, Product details

  • Variants
  • Dimensions and weight
  • Product details

DLQL-...-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 diffuser with square diffuser face
  • With plenum box for horizontal duct connection

Nominal sizes

Ceiling tile

  • 248, 298, 398, 498, 598, 623 (intermediate sizes 249 to 622, in increments of 1 mm)


Air terminal device

  • 250, 300, 400, 500, 600

Parts and characteristics

  • Perforated square diffuser face with special baffle element
  • Simple installation of the diffuser face due to central fixing screw with decorative cap (variant -P)

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)

DLQL-...-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 diffuser with square diffuser face
  • With plenum box for vertical duct connection

Nominal sizes

Ceiling tile

  • 248, 298, 398, 498, 598, 623 (intermediate sizes 249 to 622, in increments of 1 mm)


Air terminal device

  • 250, 300, 400, 500, 600

Parts and characteristics

  • Square diffuser face
  • Plenum box for vertical duct connection

Construction features

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

DLQL-...-H

Nominal size
DLQL-P
□Q1
mm
DLQL-T
□Q1
mm
ØD
mm
H1
mm
□Q3
mm
H3
mm
A
mm
C
mm
Plenum box
m
kg
250 248 593 158 8 216 250 139 50 AK-Uni-008 2.8
300 298 593 158 8 290 250 139 50 AK-Uni-001 4.0
400 398 593 198 8 372 295 164 50 AK-Uni-002 6.5
500 498 593 248 8 476 345 189 48 AK-Uni-010 9.6
600 598 593 313 8 590 410 222 50 AK-Uni-012 13.8

DLQL-T: □Q1 = 618 is available for T-bar ceilings with grid size 625DLQL-P : □Q1 to 623 mm available


DLQL-...-V

Nominal size
DLQL-P
□Q1
mm
DLQL-T
□Q1
mm
ØD
mm
H1
mm
□Q3
mm
H3
mm
C
mm
m
kg
250 248 593 123 8 198 20 50 0.9
300 298 593 158 8 272 26 50 1.2
400 398 593 198 8 354 36 50 2.0
500 498 593 248 8 458 47 50 3.1
600 598 593 313 8 572 56 50 4.4

DLQL-T: □Q1 = 618 is available for T-bar ceilings with grid size 625DLQL-P : □Q1 to 623 mm available


Diffuser face DLQL 00180152_0


DLQL

Nominal size
DLQL-P
□Q1
mm
DLQL-T
□Q1
mm
Aeff

250 248 593 0.0100
300 298 593 0.0145
400 398 593 0.0258
500 498 593 0.0403
600 598 593 0.0580

Aeff applies to four-way air discharge


Installation examples, Installation details, Basic information and nomenclature

  • Installation examples
  • Installation details
  • Basic information and nomenclature

Installation and commissioning

  • Preferably for rooms with a clear height up to 4.0 m
  • Installation in plasterboard, grid and T-bar ceilings
  • 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.

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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