• 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
• Dimensions
• Material
• Accessories
• Function
• Installation
• Adjustment
• Servicing
• Specification
• Product Code

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)