00132226_0
QLE-O


00141328_0
QLE


00132228_0
Removable diffuser face


00132236_0
Perforated sheet metal basket


00132226_0
00141328_0
00132228_0
00132236_0

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

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    Application

    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

    Description

    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
    Schematic illustration of QLE with rectangular spigot at the top
    00109814_0....
    ① Diffuser face
    ② Diffuser face fixing
    ③ Plinth
    ④ Casing
    ⑤ Perforated sheet metal basket
    ⑥ Spigot


    00109814_0....
    00128503_0
    00128508_0

    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
    QLE-U
    00132247_0


    00132247_0
    00132239_0
    QLE-U
    00141669_0


    00141669_0
    00141649_0

    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.

    Downloads

    product information

    • Product data sheet Type QLE

      Product data sheet 3,2 MB pdf

    certificates

    • Declaration of hygiene conformity Type QLE

      QLE_HC_2024_05_DE_en Hygiene certificate 1,4 MB pdf

    • Non-CE Manufacturer's statement QLE

      QLE_NotCE_2022_02_08_14_36_25_DE_en Certificate 1,5 MB pdf
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    We are here for you

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    Tel.: +49 (0)2845 / 202-0 | Fax: +49 (0)2845/202-265

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