Type QLE

Rectangular casing, one-way air discharge, for comfort zones

Compact height, space saving displacement flow diffusers

  • Nominal widths 1000 – 1500 mm, nominal heights 150 – 750 mm
  • Volume flow rate range 15 – 340 l/s or 54 – 1224 m³/h
  • Perforated plate, square pitch
  • Rectangular duct connection
  • Duct connection at the top or bottom
  • Equalising element (perforated sheet metal basket)
  • Removable diffuser face


Optional equipment and accessories

  • Exposed surface in RAL CLASSIC colours

QLE-O 00132226_0


  • Application
  • Description

Application

  • Type QLE displacement flow diffusers are used for comfort conditioning applications
  • Attractive design element for building owners and architects with demanding aesthetic requirements
  • Floor-standing installation on walls, either individually or several units 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
  • Draught-free and economical air conditioning also of larger internal spaces with several displacement flow diffusers in a regular arrangement
  • 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 hooks onto the casing, hence easy to remove
  • Duct connection at the top or bottom

Nominal sizes

  • B: 1000, 1250, 1500 mm
  • H: 150, 300, 450, 600, 750 mm

Variants

  • QLE-O: Spigot at the top
  • QLE-U: Spigot at the bottom

Parts and characteristics

  • Casing with plinth
  • Removable diffuser face made of perforated sheet metal
  • Perforated sheet metal basket

Construction features

  • Spigot suitable for rectangular ducts

Materials and surfaces

  • Casing, diffuser face and perforated sheet metal basket made of galvanised sheet steel
  • Casing and diffuser face powder-coated RAL 9010, pure white
  • Casing rear and perforated sheet metal basket dip coated RAL 9005, jet black
  • 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

Displacement flow diffusers discharge the air from air conditioning systems with a low velocity and near the floor. The low-turbulence airflow creates a pool of fresh air that 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.

This draught-free and economical type of ventilation is also suitable for large internal spaces, with several regularly arranged units.

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 QLE displacement flow diffusers are fitted with a perforated sheet metal basket as an equalising element; it 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.

With displacement ventilation, i.e. air discharge near the floor, extract air units should be installed in the upper part of a room, above the occupied zone.

Nominal sizes (B × H)

1000 × 150 to 1500 × 750 mm

Minimum volume flow rate, at 0.1 m/s

15 – 115 l/s or 54 – 414 m³/h

Maximum volume flow rate, at 0.3 m/s

45 – 340 l/s or 162 – 1224 m³/h

Supply air to room air temperature difference

–6 to –1 K

Sound power level, at 0.3 m/s

42 dB(A) max.


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

QLE, sound power level, total differential pressure and near zone

Nominal size V v0 Δpt LWA Lnz
Nominal size l/s m³/h m/s Pa dB(A) m

1000 × 150

15

54

0.10

<3

<15

<

1000 × 150

25

90

0.17

<3

<15

<

1000 × 150

30

108

0.20

<3

<15

<

1000 × 150

45

162

0.30

3

20

<

1250 × 150

20

72

0.11

<3

<15

<

1250 × 150

30

108

0.16

<3

<15

<

1250 × 150

40

144

0.21

<3

16

<

1250 × 150

55

198

0.29

4

26

<

1500 × 150

25

90

0.11

<3

<15

<

1500 × 150

40

144

0.18

<3

16

<

1500 × 150

55

198

0.24

4

26

<

1500 × 150

70

252

0.31

7

33

<

1000 × 300

30

108

0.10

<3

<15

<

1000 × 300

45

162

0.15

<3

<15

<

1000 × 300

70

252

0.23

5

19

<

1000 × 300

90

324

0.30

9

27

<

1250 × 300

40

144

0.11

<3

<15

<

1250 × 300

65

234

0.17

5

17

<

1250 × 300

90

324

0.24

9

27

<

1250 × 300

115

414

0.31

14

35

<

1500 × 300

45

162

0.10

<3

<15

<

1500 × 300

75

270

0.17

6

21

<

1500 × 300

105

378

0.23

12

32

<

1500 × 300

135

486

0.30

20

40

<

1000 × 450

45

162

0.10

<3

<15

<

1000 × 450

75

270

0.17

3

<15

<

1000 × 450

105

378

0.23

5

21

<

1000 × 450

135

486

0.30

9

29

<

1250 × 450

55

198

0.10

<3

<15

<

1250 × 450

95

342

0.17

4

17

<

1250 × 450

135

486

0.24

9

29

<

1250 × 450

170

612

0.30

14

36

<

1500 × 450

70

252

0.10

<3

<15

<

1500 × 450

115

414

0.17

7

23

<

1500 × 450

160

576

0.24

13

34

<

1500 × 450

205

738

0.30

21

42

<

1000 × 600

60

216

0.10

<3

<15

<

1000 × 600

100

360

0.17

<3

<15

<

1000 × 600

140

504

0.23

4

20

<

1000 × 600

180

648

0.30

7

28

<

1250 × 600

75

270

0.10

<3

<15

<

1250 × 600

125

450

0.17

3

17

<

1250 × 600

175

630

0.23

7

27

<

1250 × 600

225

810

0.30

11

35

<

1500 × 600

90

324

0.10

<3

<15

<

1500 × 600

150

540

0.17

5

22

<

1500 × 600

210

756

0.23

10

33

1.37

1500 × 600

270

972

0.30

16

41

1.84

1000 × 750

75

270

0.10

<3

<15

<

1000 × 750

125

450

0.17

3

<15

1.25

1000 × 750

175

630

0.23

5

21

1.88

1000 × 750

225

810

0.30

9

29

2.57

1250 × 750

95

342

0.10

<3

<15

0.65

1250 × 750

155

558

0.17

4

17

1.15

1250 × 750

220

792

0.23

8

28

1.71

1250 × 750

280

1008

0.30

14

35

2.26

1500 × 750

115

414

0.10

<3

<15

0.64

1500 × 750

190

684

0.17

6

23

1.09

1500 × 750

265

954

0.24

12

33

1.56

1500 × 750

340

1224

0.30

20

41

2.04

<: 0.2 m/s are not achieved

The near zone values are based on a supply air to room air temperature difference of –3 K


Displacement flow diffusers for air discharge near the floor, suitable for comfort zones with special demands on architecture and design.

With one-way air discharge for low-turbulence displacement ventilation. Rectangular casing for installation on a wall.

Ready-to-install component which consists of a casing with spigot at the top or bottom, a perforated sheet metal basket as an equalising element, and a perforated sheet metal diffuser face.

Spigot suitable for rectangular ducts.

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

Special characteristics

  • One-way air discharge
  • Diffuser face hooks onto the casing, hence easy to remove
  • Duct connection at the top or bottom

Materials and surfaces

  • Casing, diffuser face and perforated sheet metal basket made of galvanised sheet steel
  • Casing and diffuser face powder-coated RAL 9010, pure white
  • Casing rear and perforated sheet metal basket dip coated RAL 9005, jet black
  • P1: Powder-coated, RAL CLASSIC colour

Technical data

  • Nominal sizes (B × H): 1000 × 150 – 1500 × 750 mm
  • Minimum volume flow rate, at 0.1 m/s: 15 – 115 l/s or 54 – 414 m³/h
  • Maximum volume flow rate, at 0.3 m/s: 45 – 340 l/s or 162 – 1224 m³/h
  • Supply air to room air temperature difference: –6 to –1 K
  • Sound power level, at 0.3 m/s: 42 dB(A) max.

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.

00135931_0

 Type
QLE       Displacement flow diffuser

 Connection
       Rectangular spigot
O       Top
U       Bottom

 

 Nominal size [mm]
       B × H
       Nominal width B
1000
1250
1500
       Nominal height H
150
300
450
600
750
All sizes can be combined

 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: QLE–U/1250×300/P1–RAL 9016

Connection

Rectangular spigot at the bottom

Nominal size

1250 × 300 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.

QLE

Nominal size
B1
mm
H1
mm
B4
mm
m
kg
1000×150 1060 272 350 10
1250×150 1310 272 350 12
1500×150 1560 272 350 14
1000×300 1060 422 350 13
1250×300 1310 422 350 15
1500×300 1560 422 350 17
1000×450 1060 572 485 16
1250×450 1310 572 485 19
1500×450 1560 572 485 22
1000×600 1060 722 700 21
1250×600 1310 722 700 24
1500×600 1560 722 700 27
1000×750 1060 872 770 24
1250×750 1310 872 770 28
1500×750 1560 872 770 32


Installation examples, Installation details, Basic information and nomenclature

  • Installation examples
  • Installation details
  • Basic information and nomenclature
00162327_0


Installation and commissioning

  • With displacement ventilation and air discharge near the floor, extract air devices should be installed in the upper part of a room, above the occupied zone.

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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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