FD-introduction-image
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Circular diffuser faces with circular plenum box

FD_img_03psd.png

Square diffuser face with square plenum box

FD_img_04psd.png

Circular diffuser face with circular plenum box and top entry spigot 

 

 

FD_gc_01psd.png

Horizontal swirling air discharge

FD-introduction-image
FD_img_02psd.png
FD_img_03psd.png
FD_img_04psd.png
FD_gc_01psd.png

FD   

For comfort zones, with fixed air control blades

Circular and square ceiling swirl diffusers that create high induction levels, for high room air change rates
■ Nominal sizes 300, 400, 500, 600, 625
■ Volume flow rate range 9 – 235 l/s or 31 – 846 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, and with an extended border also suitable for freely suspended installation
■ High induction results in a rapid reduction of the temperature difference and airflow velocity
■ Very high room air change rate possible thanks to row arrangement with a minimum pitch distance of 0.9 m
■ Ideal for comfort zones
■ Circular diffuser faces can be easily mounted without tools in a circular plenum box with horizontal spigot

Optional equipment and accessories
■ Exposed diffuser face available in RAL CLASSIC colours
■ Square plenum box with cord-operated damper unit and pressure tap

General information

Application
  • Ceiling swirl diffusers are used as supply air or extract air diffusers for comfort zones
  • Attractive design element for building owners and architects with demanding aesthetic requirements
  • 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 – +10 K
  • For room heights up to 4 m (lower edge of suspended ceiling)
  • For all types of ceiling systems
  • With an extended border also suitable for freely suspended installation (supply air variant)

Special characteristics
  • 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, and with an extended border also suitable for freely suspended installation
  • Horizontal or vertical duct connection
  • Very high room air change rate possible thanks to row arrangement with a minimum pitch distance of 0.9 m

Nominal sizes

  • 300, 400, 500, 600, 625

Variants
  • FD-Q: square diffuser face
  • FD-R: circular diffuser face
  • FD-*-Z: Supply air
  • FD-*-A: Extract air

Connection

  • H: horizontal duct connection
  • V: vertical duct connection

Accessories

Lip seal

  • For circular plenum boxes with horizontal connection spigot, the lip seal is only available in combination with the flow adjustment damper. Otherwise, it can always be selected optionally.

Attachments

  • M: Damper element for volume flow rate balancing
  • MN: Pressure tap and cord-operated damper unit for volume flow rate balancing with the diffuser face in place (only possible with square plenum box)

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180
Square plenum boxes and plenum boxes with vertical connection
  • With spigot made of galvanised sheet steel
  • Groove only available if lip density characteristic has been selected

Circular plenum boxes with horizontal spigot for nominal sizes 250, 400L, 400H and 600
  • Spigot made of black ABS
  • Spigots are fitted with a groove for a lip seal
  • Retrofitting of the lip seal is possible at a later stage
  • Damper blade and lip seal (optional) are factory fitted
  • 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 cap
  • 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

Materials and surfaces
  • Grille face made of galvanised sheet steel
  • Q; R: Plenum box made of galvanised sheet steel including galvanised sheet steel cross bar to support the diffuser face
  • Plenum boxes with vertical connection and square plenum boxes with horizontal connection: for supply air always with galvanised perforated plate for air distribution
  • Circular plenum boxes with horizontal spigot: Equipped as a plenum box for supply air with an equalising element made of polyester
  • Square plenum boxes and plenum boxes with vertical spigot: Spigot made of galvanised sheet steel
  • Circular plenum boxes with horizontal spigot: Spigot made of black ABS, according to UL94, V0 flame retardant
  • Lip seal made of Evoprene
  • 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

  • Low maintenance as construction and materials are not subject to wear
  • Inspection and cleaning to VDI 6022

Technical information

  • Function
  • TECHNICAL DATA
  • SPECIFICATION TEXT
  • ORDER CODE
Schematic illustration of FD with square plenum box and side entry spigot
Schematic-illustration-FD

① Diffuser face

② Central fixing screw with decorative cap

③ Plenum box

④ Cross bar

⑤ Suspension hole

⑥ Spigot

Optional

⑦ Lip seal

⑧ Damper blade for volume flow rate balancing

⑨ Pressure tap

⑩ Green cord for closing the damper blade

⑪ White cord for opening the damper blade

⑫ Measuring tube

⑬ Text label indicating plenum box variant

⑭ Perforated plate as an equalising element (only for supply air)

 

Schematic-illustration-FD
Schematic-illustration-2-FDpng
FD_gc_04psd.png
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 FD 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 FD diffusers may also be used for extract air.

Nominal sizes300, 400, 500, 600, 625 mm

Minimum volume flow rate, with Δtz = -6 K

9 – 28 l/s or 31 – 102 m³/h

Maximum volume flow rate, with LWA ≅ 50 dB(A)

70 – 235 l/s or 252 – 846 m³/h
Supply air to room air temperature difference-12 – 10 K

This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design program.


Specification text
Ceiling swirl diffusers with square or circular diffuser face.
Supply air and extract air variants for comfort zones, for a maximum air change rate of 35 per hour. Diffuser face with individually manually adjustable 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 consisting of the diffuser face with radially arranged, individually adjustable black or white set of air control blades and a plenum box, which is also square in the case of square faceplates (-Q) and round in the case of rounded faceplates (-R). The plenum box has an equalising element for supply air. The plenum box always includes a horizontally or vertically arranged spigot, cross bar and drilled holes or suspension lugs for suspension.
The diffuser face is fixed to the cross bar with a central screw, concealed by a decorative cap.
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
  • 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, and with an extended border also suitable for freely suspended installation
  • Horizontal or vertical duct connection
  • Very high room air change rate possible thanks to row arrangement with a minimum pitch distance of 0.9 m

Materials and surfaces
  • Grille face made of galvanised sheet steel
  • Q; R: Plenum box made of galvanised sheet steel including galvanised sheet steel cross bar to support the diffuser face
  • Plenum boxes with vertical connection and square plenum boxes with horizontal connection: for supply air always with galvanised perforated plate for air distribution
  • Circular plenum boxes with horizontal spigot: Equipped as a plenum box for supply air with an equalising element made of polyester
  • Square plenum boxes and plenum boxes with vertical spigot: Spigot made of galvanised sheet steel
  • Circular plenum boxes with horizontal spigot: Spigot made of black ABS, according to UL94, V0 flame retardant
  • Lip seal made of Evoprene
  • Diffuser face powder-coated, RAL 9010, pure white
  • P1: Powder-coated, RAL Classic colour

Technical data
  • Nominal sizes: 300, 400, 500, 600, 625 mm
  • Minimum volume flow rate, for ΔtZ = -6 K: 9 - 28 l/s or 31 - 102 m³/h
  • Maximum volume flow rate, at LWA ≅ 50 dB(A): 70 – 235 l/s or 252 – 846 m³/h
  • Supply air to room air temperature difference: -12 to +10 K
FD–Q–Z–H–M–L/500/P1 - RAL 9016
||||||||
12345678


1 Type

FD Swirl diffuser

2 Construction style

R circular

Q square

3 System

Z Supply air

A Extract air

4 Connection

H horizontal

V Vertical (circular plenum box)

5 Damper screen for volume flow rate balancing

No entry: without damper screen

M with damper screen

MN with cords and pressure tap (only with square plenum box)

6 Accessories

No entry: without accessories

L with lip seal

7 Nominal size [mm]

300, 400, 500, 600, 625

8 Exposed surface

No entry: powder-coated, RAL 9010 (pure white)

P1 powder-coated, specify RAL CLASSIC colour

Gloss level

RAL 9010 GU 50

RAL 9006 GU 30

All other RAL colours GU 70

Note: Circular plenum boxes with a horizontal spigot have either no damper blade and no lip seal or both a damper blade and a lip seal. Items 2 and 4 define apply to the plenum box.


Order example: FD–Q–Z–H–MN/500/P1–RAL 9016

Construction styleSquare
SystemSupply air
ConnectionHorizontal
Damper blade for volume flow rate balancingWith cord and pressure tap
Accessorieswithout accessories
Nominal size500
Exposed surfaceRAL 9016, traffic white, GU70


Downloads

informazioni di prodotto

  • Product data sheet  FD

    FD_PD_2024_02_27_DE_en Product data sheet 840 KB pdf

brochure

  • Deckenluftdurchlaesse_IM_A00000054447_V2_2018_06_GB_enpdf.pdf

    530 KB pdf

  • E013CD1_Beipackzettel_Deckenluftdurchlaesse_Ceiling_diffuser_DE_de_enpdf.pdf

    29 KB pdf

  • Deckenluftdurchlaesse_IM_A00000054447_V2_2018_06_GB_enpdf.pdf

    530 KB pdf

certificati

  • FD_HC_2020_06_08_DE_enpdf.pdf

    1.6 MB pdf

  • Declaration of hygiene conformity Ceiling Swirl Diffusers Types FD, RFD, FDE

    HC/FD/RFD/FDE/DE/en Declaration of hygiene conformity 140 KB pdf

  • Declaration of hygiene conformity Type FD

    FD_HC_2025_11_en Declaration of hygiene conformity 1.1 MB pdf

  • Non-CE Manufacturer's statement FD

    FD_MS_CE_2026_01_DE_en Non-CE Manufacturer's statement 1000 KB pdf

manuali d'uso

  • Installation manual Ceiling diffusers

    A00000054447 Installation manual 520 KB pdf
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