00132669_0
RFD-Q-D


00134479_0
Circular diffuser face


00128770_0
With discharge nozzle


00144729_0
Horizontal swirling air discharge


00132669_0
00134479_0
00128770_0
00144729_0

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 m³h
  • 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 centere line)
  • Ideal for comfort zones


Optional equipment and accessories

  • Exposed diffuser face available in RAL CLASSIC colors
  • Horizontal or vertical duct connection
  • Plenum box with cord-operated damper blade and pressure tap

Application

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 -10 to +10K (ceiling mounted)
  • For supply air to room air temperature differences from -10 to +4K (exposed)
  • 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

Description

Variants

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


Connection

  • K: Vertical duct connection, with duct collar
  • S: Horizontal duct connection, in combination with AKV-RFD plenum box


Parts and characteristics

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


Accessories

  • AKV-ZH: Square plenum box with optional internal lining and spigot mounted damper blade
  • AKV-ZHR: Circular plenum box with optional internal lining and spigot mounted damper blade

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180

Materials and surfaces

  • Diffuser face made of galvanised steel and aluminum
  • Discharge nozzle made of aluminium
  • Plenum box, duct collar and cross bar made of galvanised sheet steel
  • P3: Diffuser face powder-coated, RAL 9010/20%
  • P6: Powder-coated, RAL CLASSIC colour 25% gloss

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, Technical data, Quick sizing, Specification text, Order Code

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

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 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


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. 40 dB (A) with damper blade position 0°.

Exact values for all parameters can be determined with our Easy Product Finder design programme.


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 plenum box with side 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

  • Diffuser face made of galvanised sheet steel
  • Diffuser nozzle made of aluminium
  • Plenum box, duct collar and cross bar made of galvanised sheet steel
  • P3: Diffuser face powder-coated, RAL 9010:20%
  • P6: Powder-coated, RAL CLASSIC colour, 25% gloss

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

  • V _______________________ [m³/h]
  • Δpt _______________________ [Pa]

Air-regenerated noise

  • LWA _______________________ [dB(A)]

Order example: RFD–Q–D–S/200/P3-RAL 9010/20%/W 

Construction style

Square

Construction

With discharge nozzle

Connection

To suit AKV plenum

Nominal size

200

Exposed Surface

RAL 9010, white, gloss level 20%

Screw cap colour

White


 

Variants, Dimensions and weight, Product details

  • VARIANTS
  • DIMENSIONS AND WEIGHT
  • PRODUCT DETAILS

RFD-Q-D-S + AKV Plenum

Variant

  • Ceiling swirl diffuser with discharge nozzle and square diffuser face

Nominal sizes

  • 125, 160, 200, 250, 315, 400

Parts and characteristics

  • Square diffuser face
  • Discharge nozzle improves aerodynamic and acoustic characteristics
  • Plenum box for horizontal duct connection
  • Circular opening to accommodate 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)

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-R-D-S + AKV Plenum

Variant

  • Ceiling swirl diffuser with discharge nozzle and circular diffuser face

Nominal sizes

  • 125, 160, 200, 250, 315, 400

Parts and characteristics

  • Circular diffuser face
  • Discharge nozzle improves aerodynamic and acoustic characteristics
  • Plenum box for horizontal duct connection
  • Circular opening to accommodate 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)

Construction features

  • Spigot suitable for circular ducts to EN 1506 or EN 13180

RFD-Q

Nominal size
RFD-Q-D-K
□Q1
mm
RFD-Q-D-K
Aeff

ØD2
mm
125 198 0.0034 120
160 248 0.0060 155
200 248 0.0092 195
250 298 0.0150 245
315 398 0.0265 310
400 498 0.0355 395

RFD-R

Nominal size
RFD-R-D-K
ØD1
mm
RFD-R-D-K
Aeff

ØD2
mm
125 200 0.0034 120
160 250 0.0060 155
200 300 0.0092 195
250 350 0.0150 245
315 450 0.0265 310
400 580 0.0355 395


RFD-R-Dx

Nominal size
RFD-R-Dx-K
ØD1
mm

RFD-R-Dx-K
Aeff

ØD2
mm
125
3000.0034120
160
3500.0060155
200
4000.0092195
250
4500.0150245
315
5500.0265310
400
6800.0355395

Installation examples, Installation details, Basic information and nomenclature

  • Installation examples
  • INSTALLATION DETAILS
  • BASIC INFORMATION AND NOMENCLATURE
Installation in continuous ceilings 00104475_0.


Installation and commissioning

  • Preferably for rooms with a clear height up to 4.0 m
  • Flush ceiling installation
  • RFD-*-D: Also for freely suspended installation
  • Horizontal or vertical duct connection


These are only schematic diagrams to illustrate installation details.

Ceiling cut-out

Variant
125
Ød
mm
160
Ød
mm
200
Ød
mm
250
Ød
mm
315
Ød
mm
400
Ød
mm
RFD-Q-D-* 170205 233 283 380 480
RFD-R-D-* 170 205 245 295 380 480

Principal dimensions

ØD [mm]

Outer diameter of the spigot

ØD₁ [mm]

Outer diameter of a circular diffuser face

ØD [mm]

Outer diameter of a circular plenum box 

ØD4 [mm]

Nominal size of a diffuser

□Q₁ [mm]

Dimensions of a square diffuser face style

□Q₃ [mm]

Dimensions of a square plenum box

H₁ [mm]

Distance (height) from the lower edge of the suspended ceiling to the lower edge of the diffuser face

H₂ [mm]

Height of a ceiling diffuser, from the lower edge of the suspended ceiling to the upper edge of the spigot

H₃ [mm]

Height of a ceiling diffuser with plenum box, from the lower edge of the suspended ceiling to the upper edge of the plenum box or of the spigot

H4 [mm]

Plenum box height excluding diffuser connection

A [mm]

Position of the spigot, defined by the distance of the spigot centre line to the lower edge of the suspended ceiling

C [mm]

Length of the spigot

m [kg]

Weight

Nomenclature

LWA [dB(A)]

A-weighted sound power level of air-regenerated noise

V [m³/h] and [l/s]

Volume flow rate

Δtz [K]

Supply air to room air temperature difference, i.e. supply air temperature minus room temperature

Δpt [Pa]

Total differential pressure

Aeff [m²]

Effective air discharge area


All sound power levels are based on 1 pW.

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product information

operation manuals

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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.: +44 (0)1842 754545 | Fax: +44 (0)1842 763051