Type FDE

For high volume flow rates, with fixed air control blades

Square ceiling swirl diffusers

  • Nominal sizes 600, 625
  • Volume flow rate range 51 – 365 l/s or 184 – 1314 m³/h
  • Diffuser face made of galvanised sheet steel, powder-coated
  • For supply and extract air
  • For variable and constant volume flows
  • For all types of ceiling systems
  • High induction results in a rapid reduction of the temperature difference and airflow velocity


Optional equipment and accessories

  • Exposed diffuser face available in RAL CLASSIC colours
  • Plenum box with cord-operated damper blade and pressure tap

FDE 00133609_0


  • Application
  • Description

Application

  • Type FDE ceiling swirl diffusers are used as supply air or extract air diffusers for comfort zones
  • Horizontal swirling supply air discharge for mixed flow ventilation
  • The efficient swirl creates high induction levels, thereby rapidly reducing the temperature difference and airflow velocity (supply air variant)
  • For variable and constant volume flows
  • For supply air to room air temperature differences from –12 to +10 K
  • For room heights up to 4.2 m (lower edge of suspended ceiling)
  • For all types of ceiling systems

Special characteristics

  • For high volume flow rates, with fixed air control blades
  • High induction results in a rapid reduction of the supply air to room air temperature difference and airflow velocity
  • For all types of ceiling systems
  • Horizontal duct connection

Nominal sizes

  • 600, 625

Variants

  • FDE-Z: Supply air
  • FDE-A: Extract air

Parts and characteristics

  • Square diffuser face
  • Diffuser face with radially arranged fixed air control blades
  • Plenum box for supply air, with an optimised equalising element that ensures a uniform airflow through the diffuser face
  • Simple installation of the diffuser face due to central fixing screw with decorative cap
  • Damper blade for volume flow rate balancing (optional)

Attachments

  • M: Damper blade for volume flow rate balancing
  • MN: Pressure tap and cord-operated damper blade for volume flow rate balancing with the diffuser face in place

Accessories

  • Lip seal

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180
  • Spigot with groove for lip seal (if accessory lip seal has been ordered)

Materials and surfaces

  • Diffuser face, perforated plate with border, plenum box and cross bar made of galvanised sheet steel
  • Lip seal made of rubber
  • Perforated plate and border dip coated RAL 9005, jet black
  • Diffuser face powder-coated RAL 9010, pure white
  • P1: Powder-coated, RAL CLASSIC colour

Standards and guidelines

  • Sound power level of the air-regenerated noise measured according to EN ISO 5135

Maintenance

  • Maintenance-free as construction and materials are not subject to wear
  • Inspection and cleaning to VDI 6022

Technical information

Function, Technical data, Quick sizing, Specification text, Order code

  • Function
  • Technical data
  • Quick sizing
  • Specification text
  • Order code

Functional description

Ceiling swirl diffusers in air conditioning systems create a swirl to supply air to rooms. The resulting airflow induces high levels of room air, thereby rapidly reducing the airflow velocity and the temperature difference between supply air and room air. Ceiling swirl diffusers allow for large volume flow rates. The result is a mixed flow ventilation in comfort zones, with good overall room ventilation, creating only very little turbulence in the occupied zone.

Type FDE ceiling swirl diffusers have fixed blades. Air discharge is horizontal omni directional. The supply air to room air temperature difference may range from –12 to +10 K.

A damper blade (optional) simplifies volume flow rate balancing for commissioning. Pressure tap and cord-operated damper blade (optional) allow for volume flow rate balancing with the diffuser face in place.

To give rooms an aesthetic, uniform look, Type FDE diffusers may also be used for extract air.

Nominal sizes

600, 625 mm

Minimum volume flow rate, at –6 K

51 – 365 l/s or 184 – 1314 m³/h

Maximum volume flow rate, at approx. 50 dB(A)

330 – 365 l/s or 1188 – 1314 m³/h

Supply air to room air temperature difference

–12 to +10 K


Quick sizing tables provide a good overview of the volume flow rates and corresponding sound power levels and differential pressures.

The minimum volume flow rates apply to a supply air to room air temperature difference of –6 K.

The maximum volume flow rates apply to a sound power level of approx. 50 dB (A) with damper blade position 0°.

Exact values for all parameters can be determined with our Easy Product Finder design programme.

FDE-Z (supply air), sound power level and total differential pressure

Nominal size V Damper blade position
Nominal size V 45° 90°
Nominal size V Δpt LWA Δpt LWA Δpt LWA
Nominal size l/s m³/h Pa dB(A) Pa dB(A) Pa dB(A)

600 × 248, 625 × 248

51

184

2

<15

3

<15

6

<15

600 × 248, 625 × 248

145

522

14

26

22

30

46

38

600 × 248, 625 × 248

235

846

38

39

57

44

122

51

600 × 248, 625 × 248

330

1188

75

50

113

56

240

62

600 × 313, 625 × 313

51

184

1

<15

1

<15

3

<15

600 × 313, 625 × 313

160

575

10

26

14

28

28

31

600 × 313, 625 × 313

260

936

25

39

37

42

74

45

600 × 313, 625 × 313

365

1314

50

50

73

52

145

56


Ceiling swirl diffusers with square diffuser face. Supply air and extract air variants for comfort zones. Diffuser face with fixed air control blades for horizontal swirling supply air discharge creating high induction levels. For installation into all types of suspended ceilings.

Ready-to-install component which consists of the casing, diffuser face, spigot, and a cross bar to which the diffuser face is fixed.

The diffuser face is fixed to the cross bar with a central screw.

Spigot suitable for ducts to EN 1506 or EN 13180.

Sound power level of the air-regenerated noise measured according to EN ISO 5135.

Special characteristics

  • For high volume flow rates, with fixed air control blades
  • High induction results in a rapid reduction of the supply air to room air temperature difference and airflow velocity
  • For all types of ceiling systems
  • Horizontal duct connection

Materials and surfaces

  • Diffuser face, perforated plate with border, plenum box and cross bar made of galvanised sheet steel
  • Lip seal made of rubber
  • Perforated plate and border dip coated RAL 9005, jet black
  • Diffuser face powder-coated RAL 9010, pure white
  • P1: Powder-coated, RAL CLASSIC colour

Technical data

  • Nominal sizes: 600, 625 mm
  • Minimum volume flow rate, with –6 K: 51 – 365 l/s or 184 – 1314 m³/h
  • Maximum volume flow rate, with approx. 50 dB(A): 330 – 365 l/s or 1188 – 1314 m³/h
  • Supply air to room air temperature difference: –12 to +10 K

Sizing data

  • V _______________________ [m³/h]
  • Δpt _______________________ [Pa]

Air-regenerated noise

  • LWA _______________________ [dB(A)]

00133915_0

 Type
FDE       Swirl diffuser

 System
Z       Supply air
A       Extract air

 Connection
H       Horizontal

 Damper blade for volume flow rate balancing
       No entry: none
M       With
MN       With cords and pressure tap

 

 Accessories
       No entry: none
L       With lip seal

 Nominal size [mm]
       □Q × ØD
600 × 248
625 × 248
600 × 313
625 × 313

 Exposed surface
       No entry: powder-coated RAL 9010, pure white
P1       Powder-coated, specify RAL CLASSIC colour

       Gloss level
       RAL 9010 50 %
       RAL 9006 30 %
       All other RAL colours 70 %

Order example: FDE–Z–H–M–L/625×248/P1-RAL 9016

System

Supply air

Connection

Horizontal

Damper blade for volume flow rate balancing

With

Accessories

Lip seal

Nominal size

625 × 248

Exposed surface

RAL 9016, traffic white, gloss level 70 %


 

Dimensions and weight, Product details

  • Dimensions and weight
  • Product details
Square diffuser face with plenum box for horizontal duct connection 00111335_0..


FDE

Nominal size
□Q1
mm
H1
mm
□Q3
mm
H3
mm
ØD
mm
A
mm
C
mm
Plenum box
m
kg
600 × 248 598 8 567 345 248 199 48 AK-Uni-004 13.1
600 × 313 598 8 567 410 313 222 50 AK-Uni-011 14.4
625 × 248 623 8 567 345 248 199 48 AK-Uni-004 13.1
625 × 313 623 8 567 410 313 222 50 AK-Uni-011 14.1

Weights apply to the supply air variant


Diffuser face FDE 00138896_0


FDE

Nominal size
□Q1
mm
□Q2
mm
Aeff

600 × 248 598 543 0.0447
600 × 313 598 543 0.0447
625 × 248 623 543 0.0447
625 × 313 623 543 0.0447


Installation examples, Installation details, Commissioning, Basic information and nomenclature

  • Installation examples
  • Installation details
  • Commissioning
  • Basic information and nomenclature

Installation and commissioning

  • Preferably for rooms with a clear height up to 4.2 m
  • Flush ceiling installation
  • Horizontal duct connection
  • If necessary, carry out volume flow rate balancing with the damper blade


These are only schematic diagrams to illustrate installation details.

Volume flow rate balancing

When several diffusers are connected to just one volume flow controller, it may be necessary to balance the volume flow rates.

  • Ceiling diffusers with universal plenum box and damper blade (variant -M): The diffuser face can be removed to access the damper blade; the damper blade can then be set to any position between 0 and 90°
  • Ceiling diffusers with universal plenum box, damper blade and pressure tap (variant -MN): The diffuser face need not be removed since the damper blade can be set with two cords (white and green).

Volume flow rate measurement

Ceiling diffusers with universal plenum box, damper blade and pressure tap (variant -MN) allow for volume flow rate balancing even with the diffuser face in place.

  • Connect the measuring tube to the digital manometer
  • Read the effective pressure
  • Read the volume flow rate off the characteristic or calculate it
  • If necessary, adjust the damper blade position with the cords


A characteristic is included with each AK-Uni plenum box.

Principal dimensions

ØD [mm]

Outer diameter of the spigot

ØD₁ [mm]

Outer diameter of a circular diffuser face

ØD₂ [mm]

Diameter of a circular diffuser face style

ØD₃ [mm]

Diameter of a circular plenum box

□Q₁ [mm]

Outer diameter of a square diffuser face

□Q₂ [mm]

Dimensions of a square diffuser face style

□Q₃ [mm]

Dimensions of a square plenum box

H₁ [mm]

Distance (height) from the lower edge of the suspended ceiling to the lower edge of the diffuser face

H₂ [mm]

Height of a ceiling diffuser, from the lower edge of the suspended ceiling to the upper edge of the spigot

H₃ [mm]

Height of a ceiling diffuser with plenum box, from the lower edge of the suspended ceiling to the upper edge of the plenum box or of the spigot

A [mm]

Position of the spigot, defined by the distance of the spigot centre line to the lower edge of the suspended ceiling

C [mm]

Length of the spigot

m [kg]

Weight

Nomenclature

LWA [dB(A)]

A-weighted sound power level of air-regenerated noise

V [m³/h] and [l/s]

Volume flow rate

Δtz [K]

Supply air to room air temperature difference, i.e. supply air temperature minus room temperature

Δpt [Pa]

Total differential pressure

Aeff [m²]

Effective air discharge area


All sound power levels are based on 1 pW.

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Contact

Thank you for your message!

Visual contact Visual contact

Your message is send and will be processed shortly.
Our department for Service-Requests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +49 (0)2845 / 202-0 | Fax: +49 (0)2845/202-265