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Halton Zen ZSC – Displacement ventilation unit

Semi circle displacement ventilation unit which is aesthetic in design.

  • Capacity for wide supply airflow range.
  • The airflow is patterned for 180 degrees of diffusion, enabling large airflow rates with low residual velocities in the occupied zone.
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  • Capable of a large supply airflow range
  • Uniform supply air distribution is achieved through small perforations, providing optimal conditions in the immediate proximity of the diffuser.
  • Low velocity air is supplied horizontally at the floor level
  • The air flow is patterned for 180 degrees of diffusion, enabling large airflow rates with low residual velocities in the occupied zone.
  • The detachable front panel and metallic internal structure allow cleaning of the unit and ductwork
  • Circular duct connection with an integrated rubber gasket at the top/bottom

Product models and accessories

  • Model with stainless steel (AISI 316L) design
  • Model with thick front panel (1.5 mm)
  • Duct cover
  • Installation base

Quick selection

Dimensions and weight

125 360 180 600 280 140 124
160 460 230 600 360 180 159
200 460 230 1000 360 180 199
250 530 265 1200 410 205 249
315 700 350 1600 515 257 314
400 800 400 1600 600 300 399
500 900 450 2000 700 350 499
630 1000 500 2000 830 415 629
  • AB/ZSC  installation base:
    Height = 100 mm
  • SB/ZSC  installation base, high (store) model:
    Height = 200 mm, W=W+120 mm, K=K+60 mm


NS kg
125 11.4
160 15.7
200 22.0
250 29.4
315 49.1
400 58.0
500 80.4
630 94.4


 Part  Material   Note
 Front panel Perforated galvanised steel Stainless steel AISI 316L
as option
Casing Galvanised steel Stainless steel AISI 316L
as option
Flow equalisation
Perforated galvanised steel  –
Pressure measurement pipe Plastic PVC  –
Spigot Galvanised steel  –
Gasket Rubber compound  –
Installation base Galvanised steel  –
Duct cover Galvanised steel  –
Finishing Polyester-epoxy-painted
White (RAL 9003/30% gloss)
 Special colours available


 Accessory Code  Description  Note
 Duct cover (1)   DC Standard lengths
500 / 1000 / 1500 / 2000 mm
 Installation base (2)   AB  Standard height 100 mm  –
 Installation base   SB Standard height 200 mm
Dimensions = (unit size+ 60 mm)
 High (store) model

Product models

  • Model with stainless steel (AISI 316L)
  • Duct cover (DC) made of perforated steel (same as ZSC unit)
  • Thick front panel (1.5 mm)


Air is supplied into the space through the front panel of Halton Zen Semi Circle, normally at a slightly lower temperature than the room. The supply air flows down to floor level and gradually pervades the occupied space at low velocity level before finally rising up due to the convection of warm surfaces. The low velocity flow pattern is semi-circular (180°).

The non-clogging unit can be easily opened and cleaned.

Halton PRA or Halton PTS/C can be used as an airflow adjustment damper in round duct sections. The safety distance for reliable air flow measurement from the displacement unit is 5 duct dimensions between displacement unit and air flow adjustment damper.
If air flow adjustment damper is installed closer to the displacement unit (minimum distance about 3 duct dimensions), supply air throw pattern is correct, but air flow measurement result will not be accurate. When installing air flow adjustment damper close to the displacement unit (minimum 3xD), attenuator could be needed between the damper and the displacement unit.

Note: The flow pattern data has been defined for floor installation.


Perform the installation in the following order:

A)   Installation without base:
Fix mounting brackets (4 places) to the Halton Zen Semi Circle
displacement ventilation supply unit (1).
Position the unit(2) against the wall and secure with mounting brackets
(delivered with the unit).

Installation with base:
Fix the base (7) onto the floor and fix the Halton Zen Semi Circle
displacement ventilation supply unit  (2) onto that.
Secure  with mounting brackets on top (1) (2 places)

B)    Fix duct cover top and bottom parts (3) and sides (4) onto the wall between
the unit and ceiling with screws.

C)    After installation of the ductwork, install the front plate of the duct cover (5)
and diffuser front plate (6)

D)     When multiple sections of duct covers are used, secure them with screws
(not included in delivery).


The supply flow rate for displacement ventilation unit is determined by measuring the differential pressure from the measurement nipple with a manometer.Use a measurement probe thin enough fit into the nipple. Then use tape or another gasket to create a seal in the nipple in order to get an accurate reading .

The flow rate is calculated by using the formula below:

Value of k factor for formula
(D = duct diameter)

D k
125 11.5
160 18.4
200 30.6
250 46.8
315 71.0
400 114.3
500 168.1
630 257.9


Code description
1.    Front panel
2.    Inner panel
3.    Casing

Open the front panel (1) by  carefully pulling the spring connections out.

Open the inner panel (2) by unscrewing the screws.

If required, the flow equalization plate can be detached.

Wipe the parts with a brush or damp cloth. Do not immerse in water.

After cleaning, reassemble in reverse order.


The Halton Zen Semi Circle displacement ventilation supply unit is made of galvanized steel, polyester-epoxy-painted with a white (RAL 9003) colour.

The unit has a robust maintenance-free, non-clogging structure.

The unit is comprised of a detachable, perforated front and inner panel, an internal flow equalization plate, and casing.

The unit has a circular duct connection at the top or bottom, depending the location of the unit.

Mounting brackets are included in the delivery, screws not.


The unit can be equipped with a duct cover and/or installation base where required.

The front panel of the unit is available of 1.5mm thick galvanised steel for demanding spaces.

Order code


D = Diameter of duct connection (mm)
125, 160, 200,  250, 315, 400, 500, 630

Other options and accessories

MA = Material
CS      Steel
AS      Stainless steel (AISI 316L)

TP  = Front panel thickness 1.5 mm
N         No
Y         Yes

CO = Colour
SW     Signal white (RAL 9003)
X         Special colour

ZT  = Tailored product
N         No
Y         Yes (ETO)

Sub products

DC      Duct cover
AB      Standard base
SB      High store base

Code example

 ZSC-200, MA=CS, TP=N, CO=SW, ZT=N

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