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Halton DFB – Conical diffuser

Easy to clean and maintain.

  • Suitable for horisontal supply and exhaust
  • All sizes adapted for installation in modular 600×600 mm suspended ceiling
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  • Suitable for horisontal supply and exhaust
  • Openable cone module enables cleaning of the diffuser and ductwork.
  • All sizes adapted for installation in modular 600×600 mm suspended ceiling
  • Lightweight aluminum material


  • Airflow adjustment damper
  • Plenum options with measurement and adjustment functions
  • Measurement and adjustment module

Quick selection


6×6 295 150
9×9 370 225
12×12 445 300
15×15 520 375
18×18 595 450
21×21 670 525
24×24 745 600

6×6 295 150 225 124
9×9 370 225 310 199
12×12 445 300 350 249
15×15 520 375 415 314
18×18 595 450 500 399
21×21 670 525 550 449
24×24 745 600 600 499


 Part  Material  Finishing  Note
 Frame  Aluminium Polyester-painted,
(RAL 9003 / 30% gloss)
 Special colours available
 Central cone  Aluminium Polyester-painted,
(RAL 9003 / 30% gloss)
 Special colours available


 Accessory Code  Description
 Plenum PDF/H Plenum for horizontal duct connection
(with or without insulation)
 Plenum PDF/V Plenum for vertical duct connection
(with or without insulation)
 Airflow measurement
and adjustment module
MSM  For supply installation
 Sound attenuation IN  Mineral wool in the plenum
 Flow adjustment damper ODD Aluminium opposite blade damper for
flow adjustment

Product Models

All standard sizes are available also with 1, 2 or 3 supply directions (DFC).


Air is supplied horisontally into the space through the slots in the conical front panel.
Supply air mixes with room air in the vicinity of the diffuser.

The fixed cones of the diffuser are designed to ensure that the supply air flows along the ceiling.

The Halton DFB diffuser can also be used as an exhaust unit.


Code description
1.  Plenum
2.  Spigot
3.  Clips
4.  DFB or DFC plenum

Plenum installation

The plenum is installed into the suspended ceiling with M8 drop rods (not supplied in the delivery) and connected to the ductwork with a spigot.

When equipped with a measurement and adjustment module, the recommended safety distance upstream of the device is at least 3xD, in order to ensure a reliable airflow rate measurement.
The units control spindle must not be excessively bent.

Diffuser installation

The diffuser is attached to the plenum via clips.

Dimensions of installation hole

NS H (mm) L (mm)
6×6 215 215
9×9 290 290
12×12 365 365
15×15 440 440
18×18 515 515
21×21 590 590
24×24 665 665


To aid in adjusting and measuring the air flow rate, it is recommended that the diffuser is connected to a plenum equipped with a MSM.

The supply airflow is determined by measuring the pressure difference with a measurement module.
Measure the differential pressure with a manometer.

The airflow rate is calculated according to the following formula:


∆Pm     is the measured pressure (Pa)
k          is a factor given as a function of mounting and diameter
Qv        is the airflow rate
The k factor for installations with different safety distances (distance of other items from the MSM):

Safety distance
Spigot Diameter > 6xD min. 3xD
100 6 7
125 10 12
160 19 22
200 28 32
250 49 51
315 78

Airflow adjustment damper OD

The airflow rate is adjusted by turning the damper blades behind the grille with a screwdriver. The measurement is carried out when diffuser is installed.


Remove the central cones by gently drawing out the central part.
Clean the parts by wiping them with a damp cloth.

Push the central cones back into place so that the springs lock.

Option: With balancing plenum Halton PDF + MSM

Remove the measurement and adjustment module by gently pulling the shaft (not the control spindle).
Wipe the parts with a damp cloth, instead of immersing in water.

Remount the measurement and adjustment module by pushing in the shaft until the module meets the stopper.
Push the central cones back into place so that the springs lock.


The diffuser is made of extruded aluminium, polyester-painted to white (RAL 9003) colour.

The bevel angles of the outer frame and central cone are welded so that the joints are almost invisible.

The diffuser is connected to the ductwork using a plenum with mineral wool as sound attenuation material.

The plenum is equipped with an airflow measurement and adjustment module.
The central cones of the diffuser sre detachable to provide access to the measurement and adjustment module in the plenum.

Order Code


S = Model
A     Standard
B     Suspended ceiling installation 600×600
C     Suspended ceiling installation 675×675

A = Size of connection
S=A: 6, 9, 12, 15, 18, 21, 24
S=B: 6, 9, 12, 15
S=C: 6, 9, 12, 15, 18

B = Height of connection
A=6: 6
A=9: 9
A=12: 12
A=15: 15
A=18: 18
A=21: 21
A=24: 24

Other options and Accessories

FI  = Finishing
PN     Painted

CO = Colour
SW      White (RAL 9003)
X        Special colour

ZT  = Tailored product
N        No
Y       Yes (ETO)

Sub products

PDF   Plenum for DFB and DFC

Code example



  • Halton DFB – Conical diffuser



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  • Halton DFB – fr


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