00133166_0
Circular diffuser faces with circular plenum box FD

Circular diffuser faces with circular plenum box

00132627_0

Square diffuser face with square plenum box

Circular diffuser face with circular plenum box and top entry spigot FD

Circular diffuser face with circular plenum box and top entry spigot

00147178_0

Horizontal swirling air discharge

00133166_0
Circular diffuser faces with circular plenum box FD
00132627_0
Circular diffuser face with circular plenum box and top entry spigot FD
00147178_0

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

  • Air change rates of up to 35 per hour can be achieved by arranging several diffusers in a row with a minimum pitch of 0.9 m (centre line to centre line)

  • Ideal for comfort zones


Optional equipment and accessories

  • Exposed diffuser face available in RAL CLASSIC colours

  • Plenum box with cord-operated damper blade 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 features

  • 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

  • Spigot in black ABS material

  • Groove for installation of the lip seal always available

  • Later retrofitting of the lip seal possible

  • 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 spreader beam 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, Quick sizing, Specification text, Order code

  • FUNCTION
  • TECHNICAL DATA
  • QUICK SIZING
  • SPECIFICATION TEXT
  • ORDER CODE

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, at Δtz = -6 K9 – 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 – 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 program.

FD-*-Z-H (supply air), sound power level and total differential pressure

qv [l/s]qv [m³/h]45°90°
NGΔpt [Pa]LWA [dB(A)]Δpt [Pa]LWA [dB(A)]Δpt [Pa]LWA [dB(A)]
3009311<151<152<15
35126132817272727
55198313941406739
802886750875414254
40016591<151<152<15
60216102414252726
105378323942408344
1455226050815315857
50024851<152<154<15
80288122419264329
1354863339534112345
1856666250995423158
600, 625281021<151<153<15
95342102515252924
160576283941408139
2258105550815216053

0°, 45°, 90°: Damper blade position



FD-*-Z-V (supply air), sound power level and total differential pressure

qv [l/s]qv [m³/h]45°90°
NGΔpt [Pa]LWA [dB(A)]Δpt [Pa]LWA [dB(A)]Δpt [Pa]LWA [dB(A)]
3009311<151<152<15
3010892511251925
50180263832385438
702525149624910649
40016591<151<152<15
60216102413232324
105378313940397242
1455226050775113855
50024851<151<154<15
80288112414234429
1304682838363911744
1806485450705322356
600, 625281021<151<152<15
9534292512242827
160576264035417844
2207925051675514857

0°, 45°, 90°: Damper blade position


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 features

  • 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 spreader beam 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


FDQZHML / 500 / P1 – RAL …
||||||||
12345678
1 Type
FD Swirl diffuser
 
2 Construction
R Circular
Q Square
 
3 System
Z Supply air
A Extract air
 
4 Connection
H Horizontal
V Vertical (The plenum box is always a circular plenum box.)
 
5 Damper unit for volume flow rate balancing
No entry: without damper blade
M with damper blade
MN with cords and pressure tap (only with square plenum box)
 
6 Accessories
No entry required: without accessories
L with lip seal
 
7 Nominal size [mm]
300
400
500
600
625
 
8 Exposed surface
No entry required: powder-coated RAL 9010, pure white
P1 powder-coated, specify RAL CLASSIC colour
 
Gloss level
RAL 9010 GE50
RAL 9006 GE30
All other RAL colours GE70
 
 
Note: Circular plenum boxes with horizontal spigot are only available without damper blade and lip seal or with damper blade and lip seal. Features 2 and 4 define the plenum box geometry.


Order example: FD–Q–Z–H–MN/500/P1–RAL 9016
Construction styleSquare
SystemSupply air
ConnectionHorizontal
Damper unit for volume flow rate balancingWith cords and pressure tap
AccessoriesWithout accessories
Nominal size500
Exposed surfaceRAL 9016, traffic white, gloss level 70 %

Variants, Dimensions, Product details

  • VARIANTS
  • DIMENSIONS
  • PRODUCT DETAILS

FD-Q

FD-Q-*-H

Variants

  • Ceiling swirl diffuser with square diffuser face

  • With square plenum box for horizontal duct connection

Nominal sizes

  • 300, 400, 500, 600, 625 mm


Construction

  • Square diffuser face

  • Plenum box for horizontal duct connection

  • Square opening to accommodate the diffuser face

  • Equalising element that ensures a uniform airflow through the diffuser face (supply air variant)

  • Simple installation of the diffuser face due to central fixing screw with decorative cap

  • Damper blade for volume flow rate balancing (optional)

  • Pressure tap and cord-operated damper blade for volume flow rate balancing (optional)

  • Lip seal (optional)


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)




FD-Q-*-V

Variants

  • Ceiling swirl diffuser with square diffuser face

  • With plenum box for vertical duct connection


Nominal sizes

  • 300, 400, 500, 600, 625 mm


Construction

  • Plenum box for vertical duct connection

  • Circular opening to accommodate the diffuser face

  • Equalising element that ensures a uniform airflow through the diffuser face (supply air variant)

  • Simple installation of the diffuser face due to central fixing screw with decorative cap

  • Damper blade for volume flow rate balancing (optional)

  • Lip seal (optional)


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)


FD-R

FD-R-*-H

Variants

  • Ceiling swirl diffuser with circular diffuser face

  • With circular plenum box for horizontal duct connection


Nominal sizes

  • 300, 400, 500, 600, 625 mm


Construction

  • Plenum box for horizontal duct connection

  • Circular opening to accommodate the diffuser face

  • Equalising element that ensures a uniform airflow through the diffuser face (supply air variant)

  • Simple installation of the diffuser face due to central fixing screw with decorative cap

  • Damper blade for volume flow rate balancing (optional)

  • Pressure tap and cord-operated damper blade for volume flow rate balancing (optional)

  • Lip seal (optional)


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)



FD-R-*-V

Variants

  • Ceiling swirl diffuser with circular diffuser face

  • With plenum box for vertical duct connection


Nominal sizes

  • 300, 400, 500, 600, 625 mm


Construction

  • Circular diffuser face

  • Plenum box for vertical duct connection

  • Circular opening to accommodate the diffuser face

  • Equalising element that ensures a uniform airflow through the diffuser face (supply air variant)

  • Simple installation of the diffuser face due to central fixing screw with decorative cap

  • Damper blade for volume flow rate balancing (optional)

  • Lip seal (optional)


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)

FD-Q-*-H

NS□Q₁H₁□Q₃H₃∅DACm
kg
300298829025015813950AK­Uni­0014
400398837229519816450AKUni0026.2
500498847629519816450AKUni0038.5
600598856734524819948AKUni00411.6
625623856734524819948AKUni00411.9


FD-Q-*-V

NS□Q₁H₁∅D₃H₃∅DCm
kg
3002988275200158503
4003988364200198504.7
5004988462200198506.7
6005988559200248488.9
6256238559200248489.2


FD-R-*-H

NS∅D∅D₁Hm
kg
3001582732431394.2
4001983622731496.5
5001984602731499
60024857334419512.3
62524857334419512.5


FD-R-*-V

NS∅D₁H₁H₃∅D₃∅DCm
kg
300300828527815850AK-Uni-0134.2
400400833036219850AK-Uni-0146.5
500500833046019850AK-Uni-0159
600600838055724848AK-Uni-01612.3
625625838055724848AK-Uni-01612.5


FD-Q

NS□Q₁∅D₂Aeff
3002982500.0088
4003983500.0180
5004984500.0251
6005985380.0295
6256235380.0295


FD-R

NS∅D₁∅D₂Aeff
3003002500.0088
4004003500.0180
5005004500.0251
6006005380.0295
6256255380.0295

Installation and commissioning

  • Preferably for rooms with a clear height up to 4.0 m

  • Flush ceiling installation

  • Freely suspended installation only with an extended border (supply air variant)

  • Horizontal or vertical 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 as 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.

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Contact

Thank you for your message!

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