Homepage > Products > Air Diffusers > Ceiling diffusers > Ceiling swirl diffusers > Type FD FOR COMFORT ZONES, WITH FIXED AIR CONTROL BLADES Circular and square ceiling swirl diffusers that create high induction levels, for high room air change rates • Nominal sizes 300, 400, 500, 600, 625 • Volume flow rate range 9 - 235 l/s or 31 - 846 m3/h • Diffuser face made of galvanised sheet steel, powder-coated • For supply and extract air • For variable and constant volume flows • For all types of ceiling systems, and with an extended border also suitable for 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 • Plenum box with cord-operated damper blade and pressure tap

APPLICATION Application • Type FD 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...

Connection • H: Horizontal duct connection • V: Vertical duct connection Parts and characteristics • Circular or square diffuser face • Diffuser face with radially arranged fixed air control blades • Plenum box for supply air, with an optimised equalising element that ensures a uniform airflow through 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) Attachments • M: Damper blade for volume flow rate balancing • MN: Pressure tap and cord-operated damper blade for volume flow rate...

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, Technical data, Quick sizing, Specification text, Order code FUNCTION 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...

A FD-Q B FD-R a Diffuser face ® Central fixing screw ® Plenum box ® Cross bar ® Suspension hole ® Spigot Optional @ Lip seal

⑧ Damper blade for volume flow rate balancing ⑨ Pressure tap ⑩ Green cord for closing the damper blade White cord for opening the damper blade Measuring tube Text label indicating plenum box variant Horizontal omni directional air discha

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. FD-*-Z-H (supply air), sound power level and total differential pressure

Nominal size Damper blade position Nominal size FD-*-Z-V (supply air), sound power level and total differential pres

Nominal size Damper blade position Nominal size SPECIFICATION TEXT Ceiling swirl diffusers with square or circular diffuser face. Supply air and extract air variants for comfort zones. Diffuser face

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 casing, diffuser face, spigot, and a cross bar to which the diffuser face is fixed. 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 High induction results in a rapid reduction of the supply air to room air temperature difference...

ORDER CODE Order example: FD–Q–Z–H–MN/500/P1–RAL 9016 Construction style Damper blade for volume flow rate balancing With cords and pressure tap Without accessories Nominal size Exposed surface RAL 9016, traffic white, gloss lev

1 Type FD Swirl diffuser 2 Construction style 5 Damper blade for volume flow rate balancing No entry: without damper blade M With damper blade MN With cords and pressure tap (only for connection type H) g Accessories No entry: without accessories L With lip seal g 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 % Variants, Dimensions and weight, Product details VARIANTS FD-Q-*-H Designed for high comfort Together with renowned designers and architects we have developed ceiling,...

• Ceiling swirl diffuser with square diffuser face • With plenum box for horizontal duct connection Parts and characteristics • Square diffuser face • Plenum box for horizontal duct connection • Square opening to accommodate the diffuser face • Equalising element that ensures a uniform airflow through the diffuser face (supply air variant) • Simple installation of the diffuser face due to central fixing screw with decorative cap • Damper blade for volume flow rate balancing (optional) • Pressure tap and cord-operated damper blade for volume flow rate balancing (optional) • Lip seal (optional)...