Type RFD

With low sound power level for comfort and industrial zones, with fixed air control blades

Circular and square ceiling swirl diffusers

  • Nominal sizes 125, 160, 200, 250, 315, 400
  • Volume flow rate range 4 – 330 l/s or 14 – 1188 m³/h
  • Diffuser face made of galvanised sheet steel, powder-coated, or of aluminium (depending on variant)
  • For supply and extract air
  • For variable and constant volume flows
  • For all types of ceiling systems
  • With discharge nozzle ideal for cooling in case of 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
  • Horizontal or vertical duct connection
  • Plenum box with cord-operated damper blade and pressure tap
  • Shallow plenum box

RFD-Q-D 00132669_0
  • Application
  • Description

Application

  • Type RFD 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 and discharge nozzle also suitable for freely suspended installation (supply air variant)

Special characteristics

  • Low sound power level, ideal for comfort zones
  • Fixed blades
  • For all types of ceiling systems
  • 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

  • 125, 160, 200, 250, 315, 400

Variants

  • RFD-Q: Square diffuser face
  • RFD-R: Circular diffuser face
  • RFD-*-D: Diffuser face with discharge nozzle


Connection

  • K: Vertical duct connection, with duct collar
  • US: Vertical duct connection, with transition piece
  • A: Horizontal duct connection, with plenum box


Only RFD-R

  • UO: Vertical duct connection, with transition piece and cross bar


Only RFD-R-D

  • UD: Vertical duct connection, with transition piece, cross bar and discharge nozzle
  • N: Horizontal duct connection, with shallow plenum box to be installed above open cell ceilings

Parts and characteristics

  • Circular or square diffuser face
  • Diffuser face with radially arranged fixed air control blades

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

  • Q: Diffuser face made of aluminium
  • R: Diffuser face made of galvanised sheet steel
  • Plenum box, duct collar and cross bar made of galvanised sheet steel
  • Transition piece made of aluminium
  • 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 RFD-R-D, with plenum box for horizontal duct connection 00140677_0

① Diffuser face
② Central fixing screw
③ Plenum box
④ Cross bar
⑤ Suspension hole
⑥ Spigot


Optional
⑦ Lip seal
⑧ Pressure tap
⑨ Damper blade for volume flow rate balancing
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 RFD 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 RFD diffusers may also be used for extract air.

Nominal sizes125, 160, 200, 250, 315, 400 mm
Minimum volume flow rate, with ΔtZ = –6 K 4 – 36 l/s or 14 – 130 m³/h
Maximum volume flow rate, with LWA ≅ 50 dB(A)22 – 330 l/s or 79 – 1188 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 ΔptLWA
Nominal size l/s m³/h PadB(A)
125 4.4 16 2<15
125 10 36 1629
125 15 54 3638
125 24 86 9250
160 5 18 1<15
160 15 54 816
160 30 108 3434
160 47 169 8350
200 7 25 1<15
200 30 108 1526
200 50 180 4338
200 75 270 9650
250 10 36 1<15
250 45 162 1427
250 80 288 4341
250 114 410 8750
315 19 68 1<15
315 75 270 1225
315 130 468 3740
315 185 666 7550
400 27 97 1<15
400 95 342 1226
400 165 594 3540
400 230 828 6950


Quick sizing – sound power level and total differential pressure

Nominal size V ΔptLWA
Nominal size l/s m³/h PadB(A)
125 4.4 16 1<15
125 15 54 818
125 30 108 3336
125 46 166 7950
1606,4 23 1<15
160 25 90 816
160 45 162 2633
160 76 274 7450
200 9 32 0<15
200 45 162 1123
200 75 270 3137
200 110 396 6650
250 14 50 0<15
250 65 234 1021
250 115 414 3338
250 164 590 6650
315 25 90 1<15
315 95 342 1123
315 165 594 3238
315 240 864 6750
400 36 130 1<15
400 135 486 1224
400 235 846 3640
400 330 1188 7150


Ceiling swirl diffusers with square or circular diffuser face. Supply air and extract air variants for comfort zones and industrial 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 diffuser face with radially arranged fixed air control blades and either a spigot only or a plenum box with side entry or top entry spigot, and suspension holes or suspension lugs.

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

  • Low sound power level, ideal for comfort zones
  • Fixed blades
  • For all types of ceiling systems
  • 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

  • Q: Diffuser face made of aluminium
  • R: Diffuser face made of galvanised sheet steel
  • Plenum box, duct collar and cross bar made of galvanised sheet steel
  • Transition piece made of aluminium
  • Lip seal made of rubber
  • Diffuser face powder-coated RAL 9010, pure white
  • P1: Powder-coated, RAL CLASSIC colour

Technical data

  • Nominal sizes: 125, 160, 200, 250, 315, 400 mm
  • Minimum volume flow rate, with ΔtZ = –6 K: 4 – 36 l/s or 14 – 130 m³/h
  • Maximum volume flow rate, with LWA ≅ 50 dB(A): 22 – 330 l/s or 79 – 1188 m³/h
  • Supply air to room air temperature difference: –12 to +10 K

00133897_0

 Type
RFD       Swirl diffuser

 Construction style
R       Circular
Q       Square

 Construction
       No entry: without discharge nozzle
D       With discharge nozzle

 Connection
K       Vertical, with duct collar
US       Vertical, with transition piece
A       Horizontal, with plenum box
       Only RFD-R
UO       Vertical, with transition piece and cross bar
       Only RFD-R-D
UD       Vertical, with transition piece, cross bar and discharge nozzle
N       Horizontal, with shallow plenum box

 

 Damper blade for volume flow rate balancing
No entry: none
M       With (only for connection types A and N)
MN       With cords and pressure tap (only for connection type A)

 Accessories
No entry: none
L       With lip seal (only for connection types A and N)

 Nominal size [mm]
125
160
200
250
315
400

 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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For general question regarding products or services you can also call:
Tel.: +49 (0)2845 / 202-0 | Fax: +49 (0)2845/202-265