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)
  • Perforated plate has a free cross section of approx. 46 %

  • Hole diameter is 5 mm, the rows of holes are offset from each other


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.









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). The perforated plate has a free cross-section of approx. 46 % The hole diameter is 5 mm and the rows of holes are offset from each other.

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

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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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.: +44 (0)1842 754545 | Fax: +44 (0)1842 763051