WDD - Grille

Grille with adjustable horisontal and rear vanes

Horizontal air supply, suitable also for exhaust. Adjustable vertical front and horizontal rear vanes.

  • For cooling and heating applications; suitable also for exhaust
  • Adjustable vertical front vanes, adjustable horizontal rear vanes
  • Aluminium construction
  • Visible screw fastening.

 Accessories

  • Model with wax-bulb actuator for directing the supply air jet in heating operation
  • Airflow adjustment damper
  • Plenum options with measurement and adjustment functions
  • Installation frame

The grille is made of extruded aluminium, with an anodised or epoxy-painted with a white (RAL9010) standard colour.
The bevel angles of the outer frame are welded so that the joints are almost invisible.
The Halton WDD grille has horisontal and vertical adjustable vanes.
The rear vanes direct the supply air jet horizontally. The length and form of the air pattern are adjusted by turning the front vanes.

Optionally

The supply air jet shall be controlled according to supply air temperature by a wax-bulb actuator.

Alternative 1

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

Alternative 2

The grille can be connected to the ductwork using a balancing plenum, which comprises sound attenuation material made of polyester fibre with a washable surface.

The plenum comprises an airflow measurement and adjustment unit.
The grille is removable in order to provide access to the measurement and adjustment module in the plenum.

Halton WDD

Grille

  • Horizontal supply, for circular duct installations
  • For cooling and heating applications; suitable also for exhaust
  • Adjustable vertical front vanes, adjustable horizontal rear vanes
  • Steel construction
  • Visible screw fastening

Accessories

  • Model with wax-bulb actuator for directing the supply air jet in heating operation
  • Opposite blade damper for airflow control

Dimensions

 

LxH  L1  L2  H1  H2 
200x100  226 176 126 76
250x100  276 226 126 76
300x100  326 276 126 76
300x150  326 276 176 126
400x150  426 376 176 126
400x200  426 376 226 176
500x200  526 476 226 176
600x200  626 576 226 176
800x200  826 776 226 176
1000x200  1026 976 226 176
600x300  626 576 326 276
800x300  826 776 326 276
1000x300  1026 976 326 276
1000x400  1026 976 426 376
1200x400  1226 1176 426 376

With OD (airflow adjustment damper) total depth is 48 mm + 45 mm.

Special dimensions

In addition to these standard sizes, other dimensions are available by special order. The maximum size is 1500mm x 600mm (LxH).

Material

 Part  Material  Finishing  Note
 Frame  Aluminium  Polyester-painted as
 white (RAL9010/50% gloss),
 anodised or
 mill finished
 Special colours available
 Vanes  Aluminium  Polyester-painted as
 white (RAL9010/50% gloss),
 anodised or
 mill finished
 Special colours available
 Installation frame  Galvanised steel    
 Plenum box / spigot  Galvanised steel    

The bevel angles of the outer frame have been welded so that the joints are almost invisible.

Accessories

 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 insulation)
 Airflow measurement and
 adjustment unit
MSM  For supply installation
 Airflow measurement and
 adjustment unit
MEM  For exhaust installation
 Sound attenuation IN  Mineral wool for the Halton BDR plenum box.
 Polyester fibre for the Halton PRL plenum box.
 Flow adjustment damper OD  Aluminium opposite blade damper
 for airflow adjustment
 Installation frame IF  For installation without plenum
 Visible screw fastening SF  Screw fastening
 Concealed screw fastening CC  For installation with Halton BDR plenum or IF frame
 Wax-bulb actuator MT  The actuator controls the vane angle
 depending on the supply air temperature

 

Wax-bulb actuator

In applications, where both heating and cooling are provided, the air pattern can be changed automatically via the wax-bulb actuator.
The wax-bulb actuator alters the angles of the horizontal rear vane depending on the supply air temperature. Neither auxiliary energy nor dedicated control system are needed.

When cold air is supplied at a temperature up to 18°C the supply jet is horizontal. The vane angle is 0°. As the supply air temperature rises, the actuator piston progressively changes the angle of the rear vanes to direct the supply air jet downwards. Vane angle reaches 45° in 10 to 20 minutes.

No maintenance is required for the wax-bulb actuator.

Function

Supply air is supplied with horizontal and vertical deflection through the vanes into the space. The supply air mixes with the room air in front of the grille.
The supply air is directed with the horizontal adjustable vanes.
Moving the vertical vanes can change the length and form of the flow pattern.

In wall installations, the recommended distance from the ceiling is 200 mm, when the supply air is directed to the ceiling.
The rear vane angle can also be controlled by optional wax-bulb actuator.

The Halton WDD grille can also be used as an exhaust unit.

Installation

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/WDD installation frame.


Installation frame, IF/WDD              Balancing plenum, PRL     Plenum box, BDR

Clips fastening (standard)

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

Concealed screw fastening (optional)

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

For ceiling installation, concealed screw fastening is recommended.

The dimensions of the installation holes are LxH when an installation frame is used, and (L-5) x (H-5) without installation frame.

Visible screw fastening

For ceiling installation, we recommend using visible screw fastening. The auto screws, 4.2x25 (bevel headed screws) are supplied.

Adjustment

Supply

In order to enable airflow adjustment and measurement of airflow rate we recommend connecting the diffuser to a 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 with 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 into the plenum and replace the grille.

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

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

 

Exhaust

The airflow rate is selected by measuring the pressure difference between the measurement tap on the Halton PRL balancing plenum or Halton BDR plenum and the room air.
The corresponding airflow rate is calculated and can be adjusted by turning the control spindle of the adjustment unit MEM.

Airflow adjustment damper OD

The airflow rate can also be adjusted by turning the damper blades behind the grille with a screwdriver. The measurement is carried out when grille is installed.

Servicing

Remove the grille by gently drawing it out by the frame. Use a screwdriver if necessary.
Clean the parts by wiping them with a damp cloth.
Push the grille back into place until the springs lock (or fix by screwing on the concealed screws).

Option:
With balancing plenum Halton PRL + MSM (MEM) or Halton BDR + MSM (MEM)

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

Specification

The grille is made of extruded aluminium, with an anodised or epoxy-painted with a white (RAL9010) standard colour.
The bevel angles of the outer frame are welded so that the joints are almost invisible.
The Halton WDD grille has horisontal and vertical adjustable vanes.
The rear vanes direct the supply air jet horizontally. The length and form of the air pattern are adjusted by turning the front vanes.

Optionally

The supply air jet shall be controlled according to supply air temperature by a wax-bulb actuator.

Alternative 1

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

Alternative 2

The grille can be connected to the ductwork using a balancing plenum, which comprises sound attenuation material made of polyester fibre with a washable surface.

The plenum comprises 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

WDD-L-H

L = Length 
      200, +1, .., 1500

H = Height
       100, +1, .., 600

Other options and Accessories

FS = Fastening
        CL     Clips
        SF     Screw fastening
        CC     Concealed screw fastening

FI = Finishing
       PN       Painted
       AN       Anodised     
       MF       Mill finished

CO = Colour
         W      White, as standard (RAL 9010)
         X       Special colour
         N       No painting

ZT = Tailored product
        N        No
        Y        Yes

AC = Accessories
         WM    Wax-bulb actuator

Sub products

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

Code example

        WDD-200-100, FS=CL, FI=AN, CO=N, ZT=N

Downloads & Media

Halton WDD-WSD - gb
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inglés (Reino Unido)
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Halton WDD-WSD - nl
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Halton WDD-WSD - fi
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finés (Finlandia)
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Halton WSD-WDD - fr
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Halton WDD-WSD - se
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Halton WDD-WSD - ru
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ruso (Rusia)
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