DLQ

DLQ/600

With butterfly damper

With connecting frame

With damper blade

With plenum box

Horizontal air discharge

For four-way horizontal supply air discharge, with fixed air control blades – sheet steel diffuser face

Square ceiling diffusers

Nominal sizes 250, 300, 400, 500, 600, 625
Volume flow rate range 20 – 700 l/s or 72 – 2520 m³/h
Square diffuser face
Diffuser face made of sheet steel, powder-coated
For supply and extract air
For variable and constant volume flows
For all types of ceiling systems
High induction results in a rapid reduction of the temperature difference and airflow velocity

Optional equipment and accessories

Exposed diffuser face available in RAL CLASSIC colours
Horizontal or vertical duct connection
Blanking plates for adjusting the discharge direction
Duct cross bar for installation without plenum box
Plenum box with cord-operated damper blade and pressure tap

Initialize order code

Application

Application

Type DLQ ceiling diffusers are used as supply air or extract air diffusers for comfort zones
Attractive design element for building owners and architects with demanding aesthetic requirements
Horizontal 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 four-way supply air discharge
Diffuser face made of galvanised sheet steel
For all types of ceiling systems
Horizontal or vertical duct connection

Nominal sizes

250, 300, 400, 500, 600, 625

Description

Variant

Square diffuser face

Connection

A: Diffuser face only
AR: Vertical duct connection, with connecting frame
AG: Vertical duct connection, with blades
C: Vertical duct connection with butterfly damper
AK: Horizontal duct connection, with plenum box

Parts and characteristics

Square diffuser face with fixed air control blades
Diffuser front frame
Simple installation of the diffuser face due to central fixing screw with decorative cap

Accessories

Lip seal

Construction features

Spigot suitable for circular ducts to EN 1506 or EN 13180

Materials and surfaces

Diffuser face, connecting frame and butterfly damper made of sheet steel
AK: Plenum box and cross bar made of galvanised sheet steel
X: Plenum box made of plastic and galvanised sheet steel
Lip seal made of rubber
Attachments are dip coated RAL 9005, jet black
Diffuser face powder-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

Schematic illustration of the DLQ, with plenum box for horizontal duct connection

① Diffuser face
② Central fixing screw
③ Plenum box
④ Cross bar
⑤ Suspension hole
⑥ Spigot

Optional
⑦ Lip seal
⑧ Damper blade for volume flow rate balancing
⑨ Pressure tap
⑩ Green cord for closing the damper blade
⑪ White cord for opening the damper blade
⑫ Text label indicating plenum box variant
⑬ Measuring tube

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 DLQ ceiling diffusers have fixed blades. Horizontal air discharge is 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 DLQ diffusers may also be used for extract air.

Nominal sizes	250, 300, 400, 500, 600, 625 mm
Minimum volume flow rate	20 – 250 l/s or 72 – 900 m³/h
Maximum volume flow rate, with L_WA ≅ 50 dB(A)	575 – 700 l/s or 2070 – 2520 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 maximum volume flow rates apply to a sound power level of approx. 50 dB (A).

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

Sizing example

Given data

V = 300 l/s (1280 m³/h)

Square ceiling diffuser, steel, with fixed air control blades

Maximum sound power level 40 dB(A) with damper blade position 45°

Four-way air discharge

Quick sizing

Type DLQ

Nominal sizes: 600, 625

Selected: DLQ/600

DLQ-A, DLQ-AR (supply air), sound power level and total differential pressure

Nominal size	V		Δp_t	L_WA
Nominal size	l/s	m³/h	Pa	dB(A)
250	20	72	3	<15
250	55	198	20	26
250	95	342	59	40
250	130	468	111	50
300	35	126	2	<15
300	95	342	18	24
300	155	558	47	38
300	210	756	87	50
400	75	270	2	<15
400	190	684	13	25
400	310	1116	35	38
400	430	1548	68	50
500	135	486	2	<15
500	295	1062	10	27
500	455	1638	23	39
500	615	2214	43	50
600	220	792	2	15
600	380	1440	8	34
600	535	1980	15	43
600	690	2484	24	50
625	250	900	2	20
625	400	1440	6	34
625	550	1980	12	43
625	700	2520	19	50

DLQ-AK (supply air), sound power level and total differential pressure

Nominal size	V		Damper blade position
Nominal size	V		0°		45°		90°
Nominal size	V		Δp_t	L_WA	Δp_t	L_WA	Δp_t	L_WA
Nominal size	l/s	m³/h	Pa	dB(A)	Pa	dB(A)	Pa	dB(A)
250	20	72	5	<15	5	<15	10	<15
250	35	126	14	22	16	22	31	25
250	60	216	41	38	46	38	92	41
250	90	324	92	51	104	51	208	53
300	35	126	6	9	9	11	20	19
300	70	252	26	30	37	32	81	39
300	100	360	53	41	75	43	165	49
300	135	486	96	51	137	54	301	59
400	75	270	9	13	15	21	33	30
400	130	468	28	31	46	39	98	45
400	185	666	56	42	93	50	198	57
400	235	846	90	50	150	61	319	67
500	135	486	12	16	15	19	48	35
500	210	756	28	32	36	35	116	49
500	285	1026	52	42	66	45	213	58
500	360	1296	83	50	105	53	340	65
600	220	792	12	18	19	26	49	35
600	330	1188	26	32	44	39	111	47
600	440	1584	46	42	78	49	197	57
600	545	1962	71	50	119	58	303	66
625	250	900	14	21	26	33	64	39
625	330	1188	24	31	46	42	111	47
625	410	1476	37	39	70	49	171	55
625	575	2070	74	50	138	61	336	74

Ceiling diffusers with square diffuser face. Supply air and extract air variants for comfort zones. Diffuser face with fixed air control blades for horizontal four-way air discharge. For installation into all types of suspended ceilings.

Ready-to-install component which consists of the galvanised sheet steel diffuser face with fixed air control blades, a diffuser front frame with perimeter seal and connecting frame, opposed action blades, butterfly damper or a plenum box.

Diffuser face suitable for central screw fixing.

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

Special characteristics

Horizontal four-way supply air discharge
Diffuser face made of galvanised sheet steel
For all types of ceiling systems
Horizontal or vertical duct connection

Materials and surfaces

Diffuser face, connecting frame and butterfly damper made of sheet steel
AK: Plenum box and cross bar made of galvanised sheet steel
X: Plenum box made of plastic and galvanised sheet steel
Lip seal made of rubber
Attachments are dip coated RAL 9005, jet black
Diffuser face powder-coated RAL 9010, pure white
P1: Powder-coated, RAL CLASSIC colour

Technical data

Nominal sizes: 250, 300, 400, 500, 600, 625 mm
Minimum volume flow rate: 20 – 250 l/s or 72 – 900 m³/h
Maximum volume flow rate, with L_WA ≅ 50 dB(A): 575 – 700 l/s or 2070 – 2520 m³/h
Supply air to room air temperature difference: –10 to +10 K

Sizing data

V _______________________ [m³/h]
Δp_t _______________________ [Pa]

Air-regenerated noise

L_WA _______________________ [dB(A)]

Type
DLQ Ceiling diffuser

Connection
A       Diffuser face only
AR       Vertical, with connecting frame
AG       Vertical, with blades (not for nominal size 250)
C       Vertical, with butterfly damper
ZH       Horizontal, supply air, with plenum box
AH       Horizontal, extract air, with plenum box

Damper blade for volume flow rate balancing
       No entry: without damper blade
       Only for connections ZH, AH
M       With damper blade
MN       With cords and pressure tap

Accessories
No entry: without accessories
L With lip seal (only with plenum box)

Nominal size [mm]
250
300
400
500
600
625

Cross bar
       No entry: without cross bar
E1       With duct cross bar
G1       With standard cross bar

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: DLQ-AK-M-L/500

Connection	Horizontal, with plenum box
Damper blade for volume flow rate balancing	With damper blade
Accessories	With lip seal
Nominal size	500
Exposed surface	RAL 9010, pure white, gloss level 50 %

Variants, Dimensions and weight, Product details

DLQ/250

DLQ-A

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

Nominal sizes

250, 300, 400, 500, 600, 625

Parts and characteristics

Square diffuser face
Simple installation of the diffuser face due to central fixing screw with decorative cap

DLQ-AR

Designed for high comfort

Variant

Ceiling diffuser with square diffuser face
With connecting frame

Nominal sizes

250, 300, 400, 500, 600, 625

Parts and characteristics

Square diffuser face
Connecting frame for installation of the diffuser into vertical ducts
Simple installation of the diffuser face due to central fixing screw with decorative cap

DLQ-C

Designed for high comfort

Variant

Ceiling diffuser with square diffuser face
With connecting frame
With butterfly damper

Nominal sizes

250, 300, 400, 500, 600, 625

Parts and characteristics

Square diffuser face
Connecting frame for installation of the diffuser into vertical ducts
Butterfly damper for volume flow rate balancing
Simple installation of the diffuser face due to central fixing screw with decorative cap

DLQ-AG

Designed for high comfort

Variant

Ceiling diffuser with square diffuser face
With connecting frame
With opposed action blades

Nominal sizes

250, 300, 400, 500, 600, 625

Parts and characteristics

Square diffuser face with fixed air control blades
Connecting frame for installation of the diffuser into vertical ducts
Damper blade for volume flow rate balancing
Simple installation of the diffuser face due to central fixing screw with decorative cap

DLQ-AK

Designed for high comfort

Variant

Ceiling diffuser with square diffuser face
With plenum box for horizontal duct connection

Nominal sizes

250, 300, 400, 500, 600, 625

Parts and characteristics

Square diffuser face
Plenum box for horizontal duct connection
Square opening to accommodate the diffuser face
Equalising element that ensures a uniform airflow through the diffuser face (supply air variant)
Simple installation of the diffuser face due to central fixing screw with decorative cap
Damper blade for volume flow rate balancing (optional)
Pressure tap and cord-operated damper blade for volume flow rate balancing (optional)
Lip seal (optional)

Construction features

Spigot suitable for circular ducts to EN 1506 or EN 13180

DLQ-A

DLQ-A

Nominal size	□Q mm	□Q₁ mm	H₁ mm	H₂ mm	m kg
250	140	248	13	29	0.8
300	190	298	13	29	1.1
400	290	398	13	29	1.9
500	390	498	13	29	2.8
600	490	598	13	29	4.0
625	515	623	13	29	4.2

DLQ-AR

Nominal size	□Q mm	□Q₁ mm	H₁ mm	H₂ mm	m kg
250	143	248	13	52	1.0
300	193	298	13	52	1.4
400	293	398	13	52	2.3
500	393	498	13	52	3.3
600	493	598	13	52	4.6
625	518	623	13	52	4.8

DLQ-C

Nominal size	□Q mm	□Q₁ mm	H₁ mm	H₂ mm	m kg
250	143	248	13	52	1.5
300	193	298	13	52	2.1
400	293	398	13	52	3.5
500	393	498	13	52	5.2
600	493	598	13	52	7.4
625	518	623	13	52	7.9

DLQ-AG

Nominal size	□Q mm	□Q₁ mm	H₁ mm	H₂ mm	m kg
250	143	248	13	95	1.3
300	193	298	13	95	1.8
400	293	398	13	95	3.1
500	393	498	13	95	4.6
600	493	598	13	95	6.5
625	518	623	13	95	7.2

DLQ-AK

Nominal size	□Q₁ mm	H₁ mm	□Q₃ mm	H₃ mm	ØD mm	A mm	C mm	Plenum box	m kg
250	248	13	216	250	158	139	50	AK-Uni-008	3.0
300	298	13	266	250	158	139	50	AK-Uni-009	3.8
400	398	13	372	295	198	164	50	AK-Uni-002	6.4
500	498	13	476	345	248	189	48	AK-Uni-010	9.4
600	598	13	567	410	313	222	50	AK-Uni-011	13.2
625	623	13	567	410	313	222	50	AK-Uni-011	13.4

Weights apply to the supply air variant

Diffuser face DLQ 00156073_0

DLQ

Nominal size	□Q₁ mm	□Q₂ mm	A_eff m²
250	248	198	0.0095
300	298	248	0.0175
400	398	348	0.0370
500	498	448	0.0675
600	598	548	0.1100
625	623	573	0.1230

Installation examples, Installation details, Commissioning, Basic information and nomenclature

Installation in T-bar ceilings, arrangement in a row

Flush ceiling installation with square plenum box

① Duct
② Suspension hole
③ Diffuser face

Horizontal duct connection
Four suspension holes
Suspension with cords, wires or hangers, to be provided by others

Installation and commissioning

Preferably for rooms with a clear height up to 4.0 m
Flush ceiling installation
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.

AK-Uni-...-MN Volume flow rate balancing

① Damper blade
② White cord for opening the damper blade

Open, 0°

Volume flow rate balancing

When several diffusers are connected to just one volume flow controller, it may be necessary to balance the volume flow rates.

Ceiling diffusers with universal plenum box and damper blade (variant -M): The diffuser face can be removed to access the damper blade; the damper blade can then be set to any position between 0 and 90°
Ceiling diffusers with universal plenum box, damper blade and pressure tap (variant -MN): The diffuser face need not be removed since the damper blade can be set with two cords (white and green).

Volume flow rate measurement

Ceiling diffusers with universal plenum box, damper blade and pressure tap (variant -MN) allow for volume flow rate balancing even with the diffuser face in place.

Connect the measuring tube to the digital manometer
Read the effective pressure
Read the volume flow rate off the characteristic or calculate it
If necessary, adjust the damper blade position with the cords

A characteristic is included with each AK-Uni plenum box.

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

L_WA [dB(A)]

A-weighted sound power level of air-regenerated noise

V [m³/h] and [l/s]

Volume flow rate

Δt_z [K]

Supply air to room air temperature difference, i.e. supply air temperature minus room temperature

Δp_t [Pa]

Total differential pressure

A_eff [m²]

Effective air discharge area

All sound power levels are based on 1 pW.

Downloads

product information

Product data sheet Type DLQ

Product data sheet 3,4 MB pdf

certificates

Declaration of hygiene conformity Type DLQ

DLQ_HC_2024_05_DE_en Hygiene certificate 1,5 MB pdf
Non-CE Manufacturer's statement DLQ

DLQ_NotCE_2022_02_08_14_23_13_DE_en Certificate 1,6 MB pdf

operation manuals

Installation manual Air terminal devices

IM_2018_06_A00000054447 Installation manual 1,2 MB pdf

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DLQ

For four-way horizontal supply air discharge, with fixed air control blades – sheet steel diffuser face

Application

Description

Technical information

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

Variants, Dimensions and weight, Product details

Installation examples, Installation details, Commissioning, Basic information and nomenclature

Downloads

product information

Product data sheet Type DLQ

certificates

Declaration of hygiene conformity Type DLQ

Non-CE Manufacturer's statement DLQ

operation manuals

Installation manual Air terminal devices

TECHNICALLY NECESSARY

STATISTICS AND WEBSITE ANALYSIS

CONVENIENCE AND PERSONALISATION

FOR THE BEST TROX EXPERIENCE