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Halton HDF – Exhaust grille with filter

Aesthetic in design.

Exhaust grille with filter, reduced visibility through grille.

  • Large free area
  • Integrated filter of class EU3
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  • Large free area
  • Integrated filter of class EU3
  • Reduced visibility through grille due to shaped horizontal vanes
  • Sizes adapted to suit modular 600 x 600 mm suspended ceilings
  • Openable core vanes for direct access to the filter
  • Screw fastening

Product models and accessories

  • Airflow adjustment damper
  • Balancing plenum with measurement and adjustment functions
  • Plenum insulation
  • Spare filter


LxH L1 L2 H1 H2
570×270 595 545 295 245
570×570 595 545 595 545

With flow control damper OD total depth = 50 mm + 45 mm.

The free area of the HDF grille is 75%.


Part Material Finishing Note
Frame Aluminium Mill-finished, anodised,
or polyester-painted
as white
(RAL 9003/30% gloss)
(100%) available
Fixed vanes Aluminium Mill-finished, anodised,
or polyester-painted
as white
(RAL 9003 / 30% gloss)
(100%) available
Air filter Frame in galvanised
Filter in polyester
EU3 class
(Eurovent 4/5 method)
Plenum box,
Galvanised steel


Accessory Code Description
Special plenum for HDF Special BDR Plenum for duct connection
(with or without attenuation material),
please contact Customer Service
Airflow measurement
and adjustment unit
MEM For exhaust installation
Sound attenuation IN Mineral wool for the special BDR plenum box
Filter FI Spare filter


Air is exhausted from the space with a low pressure drop.
Wall or ceiling installation.


The grille is connected to the duct using a special BDR plenum.
The grille is fastened in place with invisible screws (not supplied), which are screwed in through the frame.

Dimensions of opening

LxH Opening
570×270 565×265
570×570 565×565


In order to enable adjustment and measurement of the airflow rate, it is recommended that you connect the diffuser to the special BDR plenum equipped with the MEM module.

The airflow rate can be adjusted and measured only when the grille is connected to the special BDR plenum.
Define the exhaust airflow rate by measuring the pressure difference between the measurement tap on the special BDR plenum and the room air. The corresponding airflow rate is calculated using the formula below.

Adjust the airflow rate by turning the control spindle of the MEM.

K factor for installations with different safety distances
(D= duct diameter)

> 6xD min. 3xD
100 6 7
125 10 12
160 19 22
200 28 32
250 49 51
315 77 83

Airflow adjustment damper OD

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


Remove the grille by gently drawing it out by the frame. Use a screwdriver if necessary.
Clean the parts by wiping with a damp cloth.
The filter can be removed for replacement by sliding sideways.
Push the grille back into place until the springs lock.

Option: With balancing plenum Halton PRL+MEM or Halton BDR+MEM

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.
Reassemble the measurement and adjustment module by pushing the shaft back into place until the module meets the stopper.
Push the grille back into place so that the springs lock.


The exhaust grille shall have a large free area.

Non-clogging lightweight construction with fixed curved vanes shall prevent visibility through the grille. The joints of the outer frame shall be practically invisible.

The grille shall be mill-finished, anodised, or polyester-painted with a white (RAL 9003) standard colour.

Sizes 570 x 270 mm and 570 x 570 mm shall be adapted to modular 600 x 600 mm suspended ceilings.
The grille shall comprise a filter of EU3 class (Eurovent method 4/5).

The grille shall be connected to the duct using a plenum.
The Halton BDR or PRL plenum shall utilise sound attenuation material made of mineral wool (optional).
Airflow measurement and adjustment unit MEM is available as an accessory to plenum.

The exhaust grille shall be openable in order to provide direct access to the filter.

Order code


L = Length (mm)

H = Height (mm)
270, 570

Other options and accessories

FI  = Finishing
AN     Anodised (class 10 um)
MF     Mill finished
PN     Painted

CO = Colour
SW    Signal white (RAL 9003)
X       Special colour (RAL xxxx)
N       No painting

ZT = Tailored product
Y       Yes
N       No (ETO)

Sub products

BDR     Plenum
PRL      Plenum
FI          Filter

Code example

HDF-570-270, FI=AN, CO=N, ZT=N


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