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Halton DRV – Multi-nozzle terminal unit

Circular and compact in design for free installation with adjustable airflow.

  • Directional nozzles with two-slot air paths efficiently deflect the airstreams
  • Supply air velocity is efficiently reduced due to the high mixing effect
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  • Horisontal or vertical air supply
  • Directional nozzles with two-slot air path efficiently deflect the airstreams
  • Supply air velocity is efficiently reduced due of high mixing effect
  • Integrated circular balancing plenum with measurement and adjustment functions
  • Circular duct connection with gasket
  • Detachable front panel enables cleaning of the terminal unit and ductwork

Quick selection

Halton DRV


100 300 289 231 93 99
125 300 289 231 103 124
160 450 439 269 121 159
200 450 439 293 138 199
250 600 589 351 174 249


Part Material Note
Front panel Steel
Nozzles Polypropylene (PP) Colour alternatives:
White, Grey and Black
Plenum Galvanised steel
Attenuation material Polyester fibre
Coupling sleeve Galvanised steel
Gasket Rubber compound
Finishing Painted, white (RAL 9003) Special colours available


Air is supplied either horizontally into the space or alternatively vertically through the adjustable nozzles in the front panel of the diffuser and mixed with the room air outside of the diffuser. Horizontal swirl jet and different air patterns can also achieved by adjusting the nozzles.

The recommended maximum air temperature difference between supply and room air is 10 0C.

The maximum recommended temperature for plastic material is 60 0C.


1.    Front panel with nozzles
2.    Plenum

The terminal unit is connected directly to the duct by screwing or riveting. Adjust the flow pattern in the desired direction by individually rotating each nozzle in order to meet the required specification.

It is recommended that the minimum safety distance before the terminal unit is 3xD.


1.   Front panel with nozzles
2.   Measurement and adjustment module
3.   Plenum

The supply airflow is determined using the measurement and adjustment module MSM.

Detach the plug in the plenum and connect the manometer. Measure the differential pressure using the connected manometer. The supply airflow rate is calculated using the formula below.

Adjust the supply airflow rate by rotating the control spindle until the desired setting is achieved.
Lock the damper position with the screw.
Reassemble the tubes and spindle into the plenum and reinstall the plug.

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

NS > 8xD min. 3xD
100 6,0 8,5
125 10,0 13,0
160 17,1 22,8
200 27,5 32,1
250 47,9 55,5


Detach the cover plug and open the front panel of the diffuser. By pressing the stoppers each nozzle can easily be removed through the front panel. Wipe the nozzles and front panel with damp cloth. The nozzles are relpaced by pushing into the front panel.

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

Reassembly the measurement and adjustment module by pushing the shaft back into place until yhe unit meets the stopper.

Reinstall the front panel back into place.


The diffuser and plenum is made of painted steel with a white (RAL 9003) standard colour. The front panel of the diffuser is equipped with plastic nozzles, which have two-slot construction in order to ensure effective mixing of supply air. Nozzles are individually adjustable to provide high flexibility for the adjustment of the throw pattern.

The diffuser is integrated to a balancing plenum equipped with a measurement and adjustment module.

The diffuser has detachable front panel in order to provide access to the measurement and balancing module in the plenum and to the duct.

The plenum has detachable a spigot equipped with integral gasket for airtight duct connection.

Order code


D = Diameter of duct Connection
100, 125, 160, 200, 250

Other options and accessories

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

Colour for nozzles is not selectable.

ZT  = Tailored product
N       No
Y       Yes (ETO)

Code example

DRV-100, CO=SW, ZT =N


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