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VAV linear diffuser
VAV linear diffuser

Halton Jaz Linear VAV (JLS ) – Linear diffuser

Variable air volume active linear diffuser for Halton Workplace system. Suitable for demanding office conditions.

  • Suitable for demand based control system.
  • Special profile diffuser blades create the Coanda effect which enables wide range of airflow rates.


  • Suitable for demand based Halton Vario control system.
  • Special profile diffuser blades create the Coanda effect which enables wide range of airflow rates.
  • Designed for systems with constant static pressure ductwork system
  • Horisontal or vertical plane jet air supply
  • Supply in one or two directions
  • Suitable also for exhaust air
  • Ceiling installation

Other options

  • Sound attenuation for plenum


Slots F L L1 H H1 K K1 K2 ØD
(as default)
1172 1 54 1218 1172 275..295 220 67 47 117 160
1172 2 92 1218 1172 315..335 260 105 85 155 200
1172 3 130 1218 1172 315..335 260 143 123 193 200
1172 4 168 1218 1172 355..375 300 181 161 231 250

The installation hole in the ceiling: F x (L1+10)


 Part  Material  Finishing  Note
 Outer frame  Aluminium Anodised or
(RAL 9003/30% gloss)
Special colours
painted as option.
 End caps /
T profiles
 Aluminium Anodised or
(RAL 9003/30% gloss)
Special colours
painted as option.
 Inner vanes  Aluminium Anodised or
Epoxy-painted :
(RAL 9003/30% gloss)
Special colours
painted as option.
Flow deflection
(for supply
 Aluminium Painted:
(RAL9003/30% gloss)
Special colours
painted as option.
 Damper  Plastic POM  –  –
 Plenum / spigot Galvanised
 –  –
 Mineral wool  –  Fixed with nails.


The Halton Jaz Linear VAV is an active linear diffuser for supply or exhaust air in variable conditions.

The diffuser is composed in three parts:
the linear diffuser, the plenum and the room damper.

The plenum is divided in three chambers.

The damper controls the number of chambers where air will be supplied.
Thus, there will be four possibilities:
fully closed, fully opened and two intermediate positions to adjust the flow rate.
The damper is moved thanks to an actuator, controlled by an external room controller with an analogic control signal.
The air flow rate maximum may be adjusted  in modifying the factory parameter “preset”.

The air flows to the plenum were the duct pressure and air velocities are reduced, to improve the air distribution quality and to reduce the noise.

The air is supplied to the space through the linear slots of the diffuser horizontally in one or two directions along the ceiling surface (coanda effect) or vertically into the occupied zone.

For an exhaust application, the diffuser is extracted without flow control vanes.

The system is designed to operate with a constant pressure ductwork.


1.    Mounting bracket
2.    Transversal bar
3.    Screw
4.    Fixing hole

We recommended installing the plenum part into the suspended ceiling with M8 drops rods (not supplied in the delivery) in the four corners thanks to the fixing holes Connecte to the ductwork with a spigot equipped with an integral rubber gasket.

Connect the linear diffuser  directly to the plenum. Remove the T-profiles of the diffuser by pulling them out gently, in order to access the transversal bars located behind the profiles.

Fit the installation brackets into the grooves of the plenum and secure with the screws into the holes of the transversal bars.

Screw on until the diffuser is flush to the ceiling.  Replace the T-profiles.


Check that the duct zone constant pressure is at the intended level (for example, between 40 and 70 Pa).

If the duct zone pressure is to low and the zone pressure control damper is fully open, you should either adjust the supply fan pressure set point to be higher.

The damper which control the duct zone pressure shall have a sufficient differential pressure over the diffuser damper (for example, 30 Pa or more).


The wiring shall be carried out in accordance with local regulations and by professional technicians.

For the power supply of all control options, a safety-isolating transformer shall be used.

With 0 V control signal the active flow control damper is fully open.

Terminals 1&2                Supply : 24 VAC or 24 VDC
Terminal 3                      Analogic signal control : 0…10 VDC
Terminal 5                      Optional, damper postion signal
For U =   2 VDC:  damper fully opened
For U = 10 VDC:  damper fully closed
Stroke direction              For Y =   0 VDC:  damper fully opened
For Y = 10 VDC:  damper fully closed


The Halton Jaz Linear VAV  diffuser flowrate is adjustable according to the damper position. The damper has 4 position options: fully opened, fully closed, and two intermediate positions.

The damper position is managed by the controller according to the data received from the sensors.

This flowrate management allow to, according to the case

  • Maintain a room space temperature
  • Improve air quality thanks to a carbon dioxide sensor (CO2)
  • Adjust the fresh air to the occupancy


1.    T-profiles
2 .   Screw
3.    Access door

Remove the T-profiles.

Remove the linear diffuser by unscrewing the screws of the transversal bars.

Clean the parts by wiping with a damp cloth.

Push the linear diffuser back into place by screwing the transversal bars to the installation brackets.

An access door is designed in the plenum to give access to the actuator.


Halton-brand ceiling diffuser unit, type Halton Jaz Linear VAV, with one to four slots, for variable airflow.

Excellent Coanda effect provided with a wide range of airflow rates.

The airflow is adjust by the damper without consequences for the jet length.
The airflow rate maximum can be adjusted in modifying the factory parameter “preset”.

Each air pattern adjustment section compromises two flow deflection vanes.
The supply air pattern is directable by adjusting the flow deflection vanes without any change in the appearance of the diffuser.

The linear slot diffuser has an extruded aluminium outer frame, flow deflection vanes and T-profiles, and be anodised or polyester-painted to white (RAL 9003/30%) colour.

The plenum part comprises sound attenuation material made of mineral wool.
The plenum part reduces duct pressure and air velocity in order to supply air throughout the entire face area of the linear diffuser and improve the air distribution quality.

The removable linear slot diffuser are mounted into the invisible screws.

Flow deflection vanes and T-profiles is easily removable for access to the plenum.

An access door for access to the actuator.

Order code


S =  Model
S     Supply
E     Exhaust

N = Number of slots

L = Active lenght

D = Diameter of duct connection
125, 160, 200, 250

Other options and accessories

FI  = Finishing
PN      Painted
AN      Anodised

CO = Colour  
SW    White (RAL 9003)
X       Special colour
N      No painting

IO = Ceiling type installation options
NA      Standard T-profile
FL       Fineline 15

IN = Number of insulated sides
N        No attenuation
2         Sound attenuation on 2 sides
4         Sound attenuation on 4 sides

RC = Room controller
NA      Not assigned

SE = Sensors
NA     Not assigned

ZT = Tailored product
N        No
Y        Yes (ETO)

Code example

JLS/S-4-1172-250, FI=AN, CO=N, IO=NA, IN=N, RC=NA, SE=NA, ZT=N


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