FD

Application

• 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 – +10 K
• For room heights up to 4 m (lower edge of suspended ceiling)
• For all types of ceiling systems
• With an extended border also suitable for freely suspended installation (supply air variant)

Special features

Nominal sizes

• 300, 400, 500, 600, 625

Variants

• FD-Q: square diffuser face
• FD-R: circular diffuser face
• FD-*-Z: Supply air
• FD-*-A: Extract air

Connection

• H: horizontal duct connection
• V: vertical duct connection

Accessories

Lip seal

• For circular plenum boxes with horizontal connection spigot, the lip seal is only available in combination with the flow adjustment damper. Otherwise, it can always be selected optionally.

Attachments

• M: Damper element for volume flow rate balancing

• MN: Pressure tap and cord-operated damper unit for volume flow rate balancing with the diffuser face in place (only possible with square plenum box)

Construction features

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

Square plenum boxes and plenum boxes with vertical connection

• With spigot made of galvanised sheet steel
• Groove only available if lip density characteristic has been selected

Circular plenum boxes with horizontal spigot for nominal sizes 250, 400L, 400H and 600

• Spigot made of black ABS
• Spigots are fitted with a groove for a lip seal
• Retrofitting of the lip seal is possible at a later stage
• Damper blade and lip seal (optional) are factory fitted
• 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 cap
• 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

Materials and surfaces

• Grille face made of galvanised sheet steel
• Q; R: Plenum box made of galvanised sheet steel including galvanised sheet steel cross bar to support the diffuser face
• Plenum boxes with vertical connection and square plenum boxes with horizontal connection: for supply air always with galvanised perforated plate for air distribution
• Circular plenum boxes with horizontal spigot: Equipped as a plenum box for supply air with an equalising element made of polyester
• Square plenum boxes and plenum boxes with vertical spigot: Spigot made of galvanised sheet steel
• Circular plenum boxes with horizontal spigot: Spigot made of black ABS, according to UL94, V0 flame retardant
• Lip seal made of Evoprene
• Diffuser face powder-coated, RAL 9010, pure white
• P1: Powder-coated, RAL Classic colour

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

• Inspection and cleaning to VDI 6022