DDA - Conical diffuser

Square conical diffuser for ceiling installation

Easy to clean and maintain.

  • Horizontal air supply
  • Suitable for supply and exhaust
  • Low unit height
  • Supply air pattern in four directions, number of slots alternatively 1-4
  • Openable front panel enables cleaning of the diffuser and ductwork.
  • All sizes adapted for installation in modular 600x600 mm suspended ceiling
  • Circular duct connection with rubber gasket

PRODUCT MODELS & ACCESSORIES

  • Models with supply air pattern in 1, 2, or 3 directions
  • Balancing plenum with measurement and adjustment function

The diffuser shall be made of extruded aluminium vanes and frame, and of a steel central panel, polyester-painted with a white (RAL9010) standard colour.
The diffuser shall have a 4-way pattern.

The bevel angles of the outer frame and central cones of the front panel shall be welded so that the joints are almost invisible.

The diffuser shall have galvanised steel transition to provide for circular duct connection. The spigot shall have a sealing gasket for airtight duct connection.

It will be possible to connect the diffuser to the ductwork using a TRI balancing plenum, which shall comprise sound attenuation material made of polyester fibre with a washable surface.

The plenum shall comprise an airflow measurement and adjustment unit.

The diffuser must be suitable for installation into the Armstrong Orcal Axal metal ceiling system or similar 600x600 false ceilings.

The front panel of the diffuser shall be openable in order to provide access to the measurement and adjustment module in the plenum.
The front panel shall be secured to the frame by steel cables.

Introduction

DDA

Square conical diffuser
 


 

  • Horizontal air supply
  • Suitable for supply and exhaust
  • Low unit height
  • Supply air pattern in four directions, number of slots alternatively 1-4
  • Openable front panel enables cleaning of the diffuser and ductwork.
  • All sizes adapted for installation in modular 600x600 mm suspended ceiling
  • Circular duct connection with rubber gasket

Product Models & Accessories

  • Models with supply air pattern in 1, 2, or 3 directions
  • Balancing plenum with measurement and adjustment function
     

Dimensions


DIMENSIONS



NS  SLOTS  ØD 
200-1  1 199
315-1  1 314
200-2  2 199
315-2  2 314
315-3  3 314
400-3  3 399
315-4  4 319
400-4  4 399


Material


MATERIAL AND FINISHING

PART  MATERIAL  FINISHING  NOTE 
Frame Aluminium Polyester-painted /
white RAL 9010 / 50% gloss
Epoxy-painted
(100%) available
Vanes Aluminium Polyester-painted /
white RAL 9010 / 50% gloss
Epoxy-painted
(100%) available
Central part of
the front panel
Aluminium Polyester-painted /
white RAL 9010 / 50% gloss
Epoxy-painted
(100%) available
Plenum / spigot Galvanised steel    


Accessories


ACCESSORIES

ACCESSORY  CODE  DESCRIPTION 
Balancing plenum TRI/N For balancing & equalising the airflow
(with airflow adjustment and measurement unit)
Plenum PLC Plenum for duct connection
(with or without insulation)
Airflow measurement and
adjustment unit
MSM For supply installation
Sound attenuation IN Polyester fibre in the TRI plenum.
Mineral wool in the PLC plenum
Airflow adjustment damper DD Steel device for flow adjustment


PRODUCT MODELS

All standard sizes are available as a special design, where the central front panel is made of a ceiling panel (not supplied).

All standard sizes are available with special construction for supply air pattern in either 1, 2 or 3 directions.

Function


FUNCTION



Supply air is supplied horizontally into the space in 4 directions through the slots of the front panel. Supply air mixes with the room air in the vicinity of the diffuser.
The fixed vanes of the diffuser are designed to ensure that the supply air flows along the ceiling.
The DDA diffuser can also be used as an exhaust unit.

Installation


INSTALLATION




CODE  DESCRIPTION
1  FRONT PANEL
2  FRAME

The diffuser is connected either directly to the duct or using a TRI balancing plenum.

When the DDA diffuser is installed into an Armstrong Orcal Axal suspended ceiling system, it is attached to the grid system by means of site installed spring clips, providing a 90° square bevel, 9 mm deep (see detail A). The DDA must be independently supported from the structural soffit.



Installation with plenum TRI



DDA ØD  ØD1  TRI  H 
200  125 TRI-125-200 245 - 295
200  160 TRI-160-200 397 - 447
200  200 TRI-200-200 447 - 497
315  200 TRI-200-315 447 - 497
315  250 TRI-250-315 511 - 561
315  315 TRI-315-315 557 - 607
400  200 TRI-200-400 447 - 497
400  250 TRI-250-400 511 - 561
400  315 TRI-315-400 557 - 607

When the TRI spigot is installed into the plenum, the H dimension can be reduced by 60 mm.

The technical performance for the combination of supply air diffuser and TRI plenum is presented separately for the two different installations.

Duct installation



When the DDA diffuser is installed without a TRI balancing plenum, it is recommended that the diffuser be connected to ductwork using a straight connection duct of minimum length 3xD upstream of the diffuser.

Adjustment


ADJUSTMENT



CODE  DESCRIPTION
1  MEASUREMENT AND ADJUSTMENT MODULE (MSM)
2  DUCT PLUG

In order to enable airflow adjustment and measurement of airflow rate, it is recommended that the diffuser be connected to the TRI balancing plenum equipped with the MSM module.
The supply flow rate is determined by using the measurement and adjustment module MSM.

Detach the front panel and pass the tubes and control spindle through the diffuser.
Measure the differential pressure using 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 front panel.

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

TRI  >6XD  min 3XD 
125  9.9 12.6
160  16.9 21.9
200  28.3 31.0
250  47.9 51.5
315  78.6 -


Servicing


SERVICING

Remove the front panel by gently drawing it out by the central panel.
Clean the parts by wiping with a damp cloth.
Push the front panel back into place so that the springs lock.

Option: with balancing plenum TRI + MSM

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

Specification


SUGGESTED SPECIFICATIONS

The diffuser shall be made of extruded aluminium vanes and frame, and of a steel central panel, polyester-painted with a white (RAL9010) standard colour.
The diffuser shall have a 4-way pattern.

The bevel angles of the outer frame and central cones of the front panel shall be welded so that the joints are almost invisible.

The diffuser shall have galvanised steel transition to provide for circular duct connection. The spigot shall have a sealing gasket for airtight duct connection.

It will be possible to connect the diffuser to the ductwork using a TRI balancing plenum, which shall comprise sound attenuation material made of polyester fibre with a washable surface.

The plenum shall comprise an airflow measurement and adjustment unit.

The diffuser must be suitable for installation into the Armstrong Orcal Axal metal ceiling system or similar 600x600 false ceilings.

The front panel of the diffuser shall be openable in order to provide access to the measurement and adjustment module in the plenum.
The front panel shall be secured to the frame by steel cables.

Product Code


PRODUCT CODE


DDA/S-D

   S = Model
    1  1 slot, suspended ceiling tile 600x600 mm
    2  2 slots, suspended ceiling tile 600x600 mm
    3  3 slots, suspended ceiling tile 600x600 mm
    4  4 slots, suspended ceiling tile 600x600 mm

   D = Connection size
    S=1: 200, 315
    S=2: 200, 315
    S=3: 315, 400
    S=4: 315, 400
   


Specifics and accessories

   CO = Colour
    W  White

Code example

   DDA/1-200, CO=W


Sub products

   TRI  Plenum (Diffusers)
   PLC  Plenum (Ceiling diffusers)
  

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