Halton WDD – Universal grille

Overview

• For cooling and heating applications; suitable also for exhaust
• Adjustable vertical and horizontal 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

Dimensions

Halton WDD, rounded frame (R)

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

Halton WDD, flat frame (F)

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

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

Accessories

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.

Product models

Halton WDD, rounded frame (R)

Halton WDD, flat frame (F)

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

For ceiling installation, we recommend using visible screw fastening. The auto screws,
4.2×25 (bevel headed screws) are supplied.

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

Fastening options

Clips, as standard (CL)

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

Concealed screw (CC)

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 (SF)

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)

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 theroom 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 notthe 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 (RAL9003) standard colour.
The bevel angles of the outer frame are welded so that the joints are almost invisible.
The Halton WDD grille has horizontal 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 waxbulb 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; FM-VP-FS-FI-CO-ZT-AC

L = Length (mm)
200, +1, .., 1500

H = Height (mm)
100, +1, .., 600

Other options and accessories

FM = Frame model
R Rounded
F Flat

VP = Vane positioning
V Vertical at front
H Horizontal at front

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

FI = Finishing
PN Painted
AN Anodised
MF Mill finished

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

ZT = Tailored product
N No
Y Yes (ETO)

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, FM=R, FS=CL, FI=AN, CO=N, ZT=N