DF swirl diffuser
Air diffusers, plenum boxes & air valves

DF swirl diffuser

Technical details

  • suitable for supply and exhaust air
  • radial air distribution via conical diffusers
  • smooth air flow
  • optional reducer for ceiling clamping installations
  • nominal sizes: DN100 until DN355
  • Hygiene certificate


Hygiene certificate

Product details

DF Swirl Diffusers are suitable for constant and variable supply air volume flows and exhaust air. The radial air distribution occurs via conical diffusors on square or circular front plates with radial blades as air deflection elements. DF Swirl Diffusers are made of powder coated, galvanized sheet steel.

The diffusers have low turbulence connection elements for optimum air distribution with lowest flow noises. Special perforated plates provide a smooth air flow. With help of reducers made of galvanized sheet steel, DF Swirl Diffusers are suitable for installation in ceilings.

One lateral connecting piece is possible as standard. Optional, a damper and special air deflector plates are available for optimum air distribution. Setting volume flow rate is possible without dismounting of the swirl diffuser.

Nominal sizes: DN100 until DN355 mm

This product has been awarded the hygiene certificate.

Technical specifications

Not all of the variant values listed here can be combined with each other. Use our Wildeboer configurator to easily check the possible combinations.

Front plate form
  • Circular, circular hole pattern
  • Quadr., circular hole pattern
  • Quadr. (595 mm), circular hole pattern
  • Quadr. (623 mm), circular hole pattern
Hole pattern size
  • 100 mm
  • 125 mm
  • 160 mm
  • 200 mm
  • 250 mm
  • 315 mm
  • 355 mm
Connection parts
  • Quadr. plenum box, 1 connecting piece
  • Air deflector plate with fixing straps
  • Reducer with air deflector plate
  • Clamping reducer with air deflector plat
Connecting piece dimensions
  • DN100
  • DN125
  • DN160
  • DN200
  • DN250
  • DN280
  • DN315
  • Without damper
  • With damper
Air deflector plate
  • Without air deflector plate
  • With air deflector plate
Colour Plenum box
  • Galvanized inside and outside
  • Galvanized inside, outside in colour RAL
  • Black inside & outside
Lip seal
  • Without lip seal
  • With lip seal
Air direction
  • Supply air (outflowing)
  • Exhaust air (inflowing)

Product pictures

Media & Downloads

User manual DF swirl diffuser (2017-10)
Hygiene advices swirl diffuser (2010-09 / DE)
Hygiene advice reducers R and RK (2010-09 / DE)
Hygiene certificate plenum box DF (2022-11 / DE)
Hygiene certificate DF swirl diffuser (2022-11 / DE)
Hygiene certificate DF reducers (2010-03 / DE)
Quick selection swirl diffuser (2020-11 / DE)