Type 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
  • Acoustically optimised plenum box FLEXTRO

FD-Q 00133166_0
  • Application
  • Description

Application

  • Type FD 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 to +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
  • 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)

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
  • X: Flexible plenum box FLEXTRO

Parts and characteristics

  • Circular or 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

  • Grille face made of galvanised sheet steel
  • V, H: Plenum box and cross bar made of galvanised sheet steel
  • X: Plenum box made of plastic and galvanised sheet steel
  • Lip seal made of rubber
  • 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
  • Technology
  • Quick sizing
  • Specification text
  • Order code
Schematic illustration of the FD, with plenum box for horizontal duct connection 00107225_0..

A FD-Q
B FD-R
① Diffuser face
② Central fixing screw
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

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 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 to +10 K


Quick sizing – sound power level and total differential pressure

Nominal size V Damper blade position
Nominal size V 45°90°
Nominal size V ΔptLWAΔptLWAΔptLWA
Nominal size l/s m³/h PadB(A)PadB(A)PadB(A)
300 9 31 1<151<152<15
300 35 126 132817272727
300 55 198 313941406739
300 80 288 6750875414254
400 16 59 1<151<152<15
400 60 216 102414252726
400 105 378 323942408344
400 145 522 6050815315857
500 24 85 1<152<154<15
500 80 288 122419264329
500 135 486 3339534112345
500 185 666 6250995423158
600, 625 28 102 1<151<153<15
600, 625 95 342 102515252924
600, 625 160 576 283941408139
600, 625 225 810 5550815216053


Quick sizing – sound power level and total differential pressure

Nominal size V Damper blade position
Nominal size V 45°90°
Nominal size V ΔptLWAΔptLWAΔptLWA
Nominal size l/s m³/h PadB(A)PadB(A)PadB(A)
300 9 31 1<151<152<15
300 30 108 92511251925
300 50 180 263832385438
300 70 252 5149624910649
400 16 59 1<151<152<15
400 60 216 102413232324
400 105 378 313940397242
400 145 522 6050775113855
500 24 85 1<151<154<15
500 80 288 112414234429
500 130 468 2838363911744
500 180 648 5450705322356
600, 625 28 102 1<151<152<15
600, 625 95 342 92512242827
600, 625 160 576 264035417844
600, 625 220 792 5051675514857


Quick sizing – sound power level and total differential pressure

Nominal sizeVDamper blade position
Nominal sizeV45°90°
Nominal sizeVΔptLWAΔptLWAΔptLWA
Nominal sizel/sm³/hPadB(A)PadB(A)PadB(A)
600, 625 28 102 1<152<153<15
600, 625 100 360 132320253228
600, 625 170 612 393858409242
600, 625 235 846 74501115517553


Ceiling swirl diffusers with square or circular 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

  • 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
  • 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)

Materials and surfaces

  • Grille face made of galvanised sheet steel
  • V, H: Plenum box and cross bar made of galvanised sheet steel
  • X: Plenum box made of plastic and galvanised sheet steel
  • Lip seal made of rubber
  • 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, 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 to +10 K

00133903_0

 Type
FD       Swirl diffuser

 Construction style
R       Circular
Q       Square

 System
Z       Supply air
A       Extract air

 Connection
H       Horizontal
V       Vertical

 

 Damper blade for volume flow rate balancing
       No entry: without damper blade
M       With damper blade
MN       With cords and pressure tap (only for connection type H)

 Accessories
       No entry: without accessories
L       With lip seal

 Nominal size [mm]
300
400
500
600
625

 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 %

 

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Contact

Thank you for your message!

Visual contact Visual contact

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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