DFA - Conical diffuser

Square conical diffuser for ceiling installation

Easy to clean and maintain due to many slots.

  • Suitable for horisontal 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 is 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 are welded so that the joints are almost invisible.

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

The diffuser is connected to the ductwork using a balancing plenum, which comprises polyester fibre with a washable surface as sound attenuation material.

The plenum is equipped with an airflow measurement and adjustment module.
The front panel of the diffuser is detachable in order to provide access to the measurement and adjustment module in the plenum.

Halton DFA

Square conical ceiling diffuser

  • Suitable for horisontal 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

 

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

 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

 Accessory Code  Description
 Balancing plenum TRI/N  For balancing, equalizing the airflow
 (with airflow measurement and adjustment module)
 Sound attenuation IN  Polyester fibre ( Halton TRI)
 Airflow measurement
 and adjustment module
MSM  For supply installation

 


Fig.1.  Halton DFA diffuser with Halton TRI plenum

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 Halton  DFA diffuser can also be used as an exhaust unit.

Installation

Code description
1.  Front panel
2.  Frame
3.  Perforated plate

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

Installation with Halton TRI plenum

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 Halton TRI plenum is presented separately for the two different installations.

 

Duct installation

When the Halton DFA diffuser is installed without a Halton 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

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.
 

The  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

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 Halton 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

The diffuser is 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 are welded so that the joints are almost invisible.

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

The diffuser is connected to the ductwork using a balancing plenum, which comprises polyester fibre with a washable surface as sound attenuation material.

The plenum is equipped with an airflow measurement and adjustment module.
The front panel of the diffuser is detachable in order to provide access to the measurement and adjustment module in the plenum.

Order Code

DFA-D-A; FI-CO-ZT
 

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

A = Diffuser size
       125, 160, 250, 315, 400
 

Other options and accessories

FI  = Finishing
        PN     Painted

CO = Colour
         W      White

ZT  = Tailored product
         N        No
         Y        Yes
 

Sub products

          TRI     Plenum (Diffusers)
 

Code example

            DFA-125-295, FI=PN, CO=W, ZT=N

Downloads & Media

Halton DFA - fr
Type
Datasheet
Language
French (France)
Size
745.1 kB
Halton DFA - fi
Type
Datasheet
Language
Finnish (Finland)
Size
803.5 kB
Halton DFA - se
Type
Datasheet
Language
Swedish (Sweden)
Size
804.2 kB
Halton DFA - nl
Type
Datasheet
Language
Dutch (Netherlands)
Size
804.9 kB
Halton DFA - ru
Type
Datasheet
Language
Russian (Russia)
Size
833.7 kB
Halton DFA - dk
Type
Datasheet
Language
Danish (Denmark)
Size
805.8 kB
Halton DFA - gb
Type
Datasheet
Language
English (United Kingdom)
Size
803.8 kB