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RFD-Q-D


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Circular diffuser face

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With air outlet nozzle

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Without air outlet nozzle

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Horizontal swirling air discharge

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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 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


Tehničke informacije

  • FUNCTION
  • TECHNICAL DATA
  • SPECIFICATION TEXT
  • ORDER CODE
Schematic illustration of the RFD-R-D, with plenum box for horizontal duct connection
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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


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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 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


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

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. 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. Spigots are suitable for ducting according 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)


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


Sizing data
  • qᵥ [m³ /h]
  • Δpt [Pa]
    air-regenerated noise
  • LWA [dB(A)]


Life cycle assessment

A life cycle assessment is available for the product series in form of an Environmental Product Declaration (EPD) that has been checked and published by a programme holder.

Učitavanje

Informacije o proizvodu

  • Product data sheet Type RFD

    RFD_PD_2024_06_19_DE_en Product data sheet 31 MB pdf

Sertifikati

  • 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 RFD

    RFD_HC_2024_05_DE_en Hygiene certificate 1,8 MB pdf

  • Environmental Product Declaration RFD

    RFD_EPD_2024_03_DE_en Environmental Product Declarations 380 KB pdf

  • Non-CE Manufacturer's statement RFD

    RFD_NotCE_2022_02_08_14_21_59_DE_en Certificate 1,8 MB pdf

Uputstva za rukovanje

  • Installation manual Ceiling diffusers

    A00000054447 Installation manual 520 KB pdf

  • Installation manual Air terminal devices

    IM_2018_06_A00000054447 Installation manual 1,2 MB pdf

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