DFA - Conical diffuser

Square conical diffuser for ceiling installation

Easy to clean and maintain due to many slots.

  • Suitable for horizontal supply and exhaust
  • Circular duct connection with rubber gasket
  • Openable cone module enables cleaning of the diffuser and ductwork
  • Lightweight aluminum material

ACCESSORIES

  • Balancing plenum with measurement and adjustment functions

The diffuser shall be made of extruded aluminium, anodised or polyester-painted with a white (RAL 9010) standard colour.

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

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

The diffuser shall be connected to the ductwork using a balancing plenum, which comprises polyester fibre with a washable surface as sound attenuation material.
The plenum shall be equipped with an airflow measurement and adjustment module.
The front panel of the diffuser shall be detachable in order to provide access to the measurement and adjustment module in the plenum.

Introduction

DFA

Square conical ceiling diffuser
 


 

  • Suitable for horizontal supply and exhaust
  • Circular duct connection with rubber gasket
  • Openable cone module enables cleaning of the diffuser and ductwork
  • Lightweight aluminum material
     

Accessories

  • Balancing plenum with measurement and adjustment functions
     

Dimensions


DIMENSIONS




NS  W  W1  H  ØD 
125  295 150 63 124
160  370 225 63 159
250-445  445 300 63 249
250-520  520 375 63 249
400  595 450 100 399


Material


MATERIAL AND FINISHING


PART  MATERIAL  FINISHING  NOTE 
Frame Aluminium Polyester-painted/
White RAL 9010/
50% gloss
Epoxy-painting
(100%) available
Front panel Aluminium Polyester-painted/
White RAL 9010/
50% gloss
Epoxy-painting
(100%) available
Perforated plate Galvanised steel 45 % perforation  
Plenum / spigot Galvanised steel    


Accessories


ACCESSORIES




ACCESSORY  CODE  DESCRIPTION 
Balancing plenum TRI/N For balancing, equalizing the airflow
(with airflow measurement and adjustment module)
Sound attenuation IN Polyester fibre in the TRI plenum
Airflow measurement
and adjustment module
MSM For supply installation


Function


FUNCTION




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

Installation


INSTALLATION



CODE DESCRIPTION
1 FRONT PANEL
2 FRAME 3 PERFORATED PLATE

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

Installation with plenum TRI



DFA (ØD)  ØD1  TRI  W2  H1 
125  100 TRI-100-125 235 272-322
160  125 TRI-125-160 310 302-352
250-445  160 TRI-160-250 385 342-392
250-520  200 TRI-200-250 460 392-442
400  250 TRI-250-400 535 456-506


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 DFA 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


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 adjusted 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 reattach the front panel.

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

TRI  >6XD  min 3XD 
100  6.0 7.5
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 (central cones) by gently drawing out the central part.


Detach the perforated plate from the supply air section and sleeve.
Clean the parts by wiping them with a damp cloth.
Push the perforated plate back into place.
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 in the shaft until the module meets the stopper.
Push the front panel back into place so that the clips lock.

Specification


SUGGESTED SPECIFICATIONS

The diffuser shall be made of extruded aluminium, anodised or polyester-painted with a white (RAL 9010) standard colour.

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

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

The diffuser shall be connected to the ductwork using a balancing plenum, which comprises polyester fibre with a washable surface as sound attenuation material.
The plenum shall be equipped with an airflow measurement and adjustment module.
The front panel of the diffuser shall be detachable in order to provide access to the measurement and adjustment module in the plenum.

Product Code


PRODUCT CODE


DFA-D-A

   D = Connection size
    125, 160, 250, 315, 400

   A = Diffuser size
    D=125: 295
    D=160: 370
    D=250: 450, 520
    D=315: 520
    D=400: 595


Specifics and accessories

   FI = Finishing
    PN  Painted
   
   CO = Colour
    W  White

Code example

   DFA-125-295, FI=PN, CO=W


Sub products

   TRI  Plenum (Diffusers)

Downloads & Media

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