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Universal grille
Universal grille

Halton ALU – Universal grille

Aesthetic in design, suitable for indoor use. Airflow pattern is vertical (0⁰ deflection)

  • Horizontal air supply, also suitable for exhaust
  • Fixed vanes, stable throw pattern with no deflection


  • Horizontal air supply, also suitable for exhaust
  • Fixed vanes, stable throw pattern with no deflection
  • Aluminium design with elegant appearance
  • Detachable grille allows cleaning of the grille and ductwork
  • Continuous grilles available with modular design


  • Airflow adjustment damper
  • Plenum options with measurement and adjustment functions
  • Installation frame


LxH L1 L2 H1 H2
200×50 212 176 62 26
200×100 212 176 112 7
300×100 312 276 112 76
400×100 412 376 112 76
500×100 512 476 112 76
600×100 612 576 112 76
800×100 812 776 112 76
1000×100 1012 976 112 76
600×150 612 576 162 126
800×150 812 776 162 126
1000×150 1012 976 162 126
1200×150 1212 1176 162 126
1500×150 1512 1476 162 126
600×200 612 576 212 176
800×200 812 776 212 176
1000×200 1012 976 212 176
1200×200 1212 1176 212 176
1500×200 1512 1476 212 176

With flow control damper OD total depth is 35 mm + 45 mm.

The free area of the ALU grille is 65 %.

Special dimensions

In addition to standard sizes, other sizes can be specially ordered. The maximum size is 1500×500 mm (LxH).
It is possible to have a continuous grille of modular design when the installation length is greater than 1500 mm. The maximum total length is 20 m.


 Part  Material  Finishing  Note
 Frame  Aluminium  Polyester-painted as
white (RAL9003/30% gloss),
anodised or
mill finished
 Special colours
(100 %) available
 Vanes  Aluminium  Polyester-painted as
white (RAL9003/30% gloss),
anodised or
mill finished
 Special colours
(100 %) available
 Installation frame  Galvanised steel
 Plenum box / spigot  Galvanised steel


 Accessory Code  Description
 Balancing plenum PRL  For balancing & equalising the airflow
and attenuating the duct noise
 Plenum BDR  Plenum for duct connection
(with or without attenuation material)
 Sound attenuation IN  Mineral wool for the BDR plenum box.
Polyester fiber for the PRI plenum box.
 Flow adjustment damper OD  Aluminium opposite blade damper
for airflow adjustment
 Installation frame IF  For installation without plenum
 Concealed screw fastening CC  For installation with BDR plenum or IF frame


Supply air is supplied without deflection through the vanes into the space mixing with room air in front of the grille.
Wall installation for horizontal supply or ceiling installation for vertical supply.
The grille can also be used as an exhaust unit.


The grille is connected to the circular duct using either a Halton PRL balancing plenum or a Halton BDR plenum or alternatively directly to the rectangular duct using the IF/ALU installation frame.

Installation frame, IF/ALU         Balancing plenum, PRL           Plenum, BDR

Clips fastening (standard)

The grilles are supplied with clips fastening as standard.
Clips fastening is used with Halton PRL, Halton BDR and IF/ALU.

Concealed screw fastening

Concealed screw fastening is possible when the grille is installed with an installation frame (IF/ALU) or with a Halton BDR plenum, though not with a Halton PRL balancing plenum. Holes for screws are provided in the Halton BDR.

For ceiling installation concealed screw fastening is recommended.

Visible screw fastening

Visible screw fastening is not possible due to the reduced width of the frame (18 mm).

Size of the installation hole is LxH when an installation frame is used and (L-5) x (H-5) without an installation frame.


In order to enable airflow adjustment and measurement of airflow rate it is recommended that you connect the diffuser to the Halton BDR plenum or Halton PRL balancing plenum equipped with the MSM module.
The supply flow rate is determined by using the measurement and adjustment module MSM.
Detach the grille and pass the tubes and control spindle through the grille.
Measure the differential pressure using a manometer. The flow rate is calculated using the formula below.

Adjust the airflow rate by rotating the control spindle until the desired setting is achieved.
Lock the damper position with a screw.
Replace the tubes and spindle in the plenum and replace the grille.

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

Halton BDR

D >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 using a screwdriver. The measurement is carried out when grille is installed.


Remove the grille by gently pulling the grille from the outer frame and clean the parts by wiping them with a damp cloth.
Push the grille back into place so that the clips lock (or fix by tightening the concealed screws).

With balancing plenum Halton PRL or Halton BDR + MSM

Remove the measurement and adjustment module by gently pulling the shaft (NB. not the control spindle or measurement tubes!).
Wipe the parts with a damp cloth, instead of immersing in water.
Reassemble the measurement and adjustment module by pushing the shaft until the module meets the stopper.
Push the grille back into place so that the clips lock.


The grille has horisontal fixed vanes and a 18 mm wide flat frame, anodized or polyester-painted with a white (RAL 9003) colour.

Option 1

The grille can be connected to the ductwork using a plenum with mineral wool as sound insulation material.

Option 2

The grille can be connected to the ductwork using a balancing plenum, which comprises polyester fibre with a washable surface as sound attenuation material.
The plenum can have an airflow measurement and adjustment unit.
The grille is removable in order to provide access to the measurement and adjustment module in the plenum.

Order Code


L = Length (mm)
200, +1, .., 20000

H = Heigth (mm)
50, +1, .., 500

Other options and accessories

FS  = Fastening
CL       Clips
CC       Concealed screw fastening

FI =  Finishing
AN        Anodised
MF        Mill finished
PN        Painted

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

ZT = Tailored product
N          No
Y          Yes (ETO)

Sub products

BDR        Plenum
PRL        Balancing plenum
IF            Installation frame (Grilles)
OD         Opposed blade damper (Grilles)

Code example

ALU-200-50, FS=CL, FI=AN, CO=N; ZT=N


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