Ceiling swirl diffusers Type RFD Horizontal swirling air discharge Without discharge nozzle 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 With discharge nozzle ■■ 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 Circular diffuser face ■■ Horizontal or vertical duct connection ■■ Plenum box with cord-operated damper

Ceiling swirl diffusers General information Page General information Function Technical data Quick sizing Specification text Order code Variants Dimensions and weight Product details Installation examples Installation details Commissioning Basic information and nomenclature 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...

Ceiling swirl diffusers General information white – P1: Powder-coated, RAL CLASSIC colour Standards and guidelines – Sound power level of the air-regenerated noise measured according to EN ISO 5135 RFD – Maintenance-free as construction and materials are not subject to wear – Inspection and cleaning to VDI 6022

Ceiling swirl diffusers 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...

Ceiling swirl diffusers Horizontal omni directional air discharge

Ceiling swirl diffusers Technical data Nominal sizes Minimum volume flow rate, with ΔtZ = –6 K Maximum volume flow rate, with LWA ≅ 50 dB(A) Supply air to room air temperature difference

Ceiling swirl diffusers Quick sizing 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. 50 dB (A) with damper blade position 0°. Exact values for all parameters can be determined with our Easy Product Finder design programme. RFD-*-K, sound power level and total differential pressure Nominal size

Ceiling swirl diffusers Quick sizing RFD-*-D-K, sound power level and total differential pressure Nominal size RFD-*-US, sound power level and total differential pressure Nominal size

Ceiling swirl diffusers Quick sizing RFD-*-D-US, sound power level and total differential pressure Nominal size Nominal size RFD-*-A, sound power level and total differential pressure  Damper blade position

Ceiling swirl diffusers Quick sizing RFD-*-D-A, sound power level and total differential pressure Nominal size Damper blade position

Ceiling swirl diffusers Specification text This specification text describes the general properties of the product. Texts for variants can be generated 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...

Ceiling swirl diffusers Order code  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  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...

Ceiling swirl diffusers RFD-Q-K Variant – Ceiling swirl diffuser with square diffuser face Nominal sizes – 125, 160, 200, 250, 315, 400 – Square diffuser face – Circular duct collar for connection to a vertical duct Construction features – Spigot suitable for circular ducts to EN 1506 or EN 13180 RFD-Q-D-K 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 – Circular duct collar for connection to a vertical...

Ceiling swirl diffusers RFD-Q-US Variant – Ceiling swirl diffuser with square diffuser face Nominal sizes – 125, 160, 200, 250, 315, 400 RFD – Square diffuser face – Transition piece for connection to a vertical duct Construction features – Spigot suitable for circular ducts to EN 1506 or EN 13180 RFD-Q-D-US Variant – Ceiling swirl diffuser with discharge nozzle and square diffuser face Nominal sizes – 125, 160, 200, 250, 315, 400 Parts and characteristics RFD-Q-A Variant – Ceiling swirl diffuser with square diffuser face Nominal sizes – 125, 160, 200, 250, 315, 400 Parts and characteristics...