RFD

RFD-Q-D

Circular diffuser face

With air outlet nozzle

Without air outlet nozzle

Horizontal swirling air discharge

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 constant and variable 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

General information

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)

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

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 and tear
Inspection and cleaning according to VDI 6022

Teknisk information

Schematic illustration of the RFD-R-D, with plenum box for horizontal duct connection

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 allow the supply air from ventilation systems to flow into the room in a swirl pattern. 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 with an omni-directional flow. 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 sizes	125, 160, 200, 250, 315, 400 mm
Minimum volume flow rate, with Δt_Z = –6 K	4 – 36 l/s or 14 – 130 m³/h
Maximum volume flow rate, with L_WA ≅ 50 dB(A)	22 – 330 l/s or 79 – 1188 m³/h
Supply air to room air temperature difference	–12 to +10 K

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