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HSC-AD - Adjustable Helical Swirl Diffuser Current Range

Adjustable air pattern swirl diffuser for installation flush with ceiling or free-hanging. Adjustable blades attached to bellmouth guide-ring slide helically over fixed swirl vanes providing constant pressure discharge direction modulation between horizontal and vertical via manual, electric or thermal adjustment.

Volume flow rate 

  • 70 – 2000 L/s (250 – 7200 m³/h) 

Discharge height

  • 2.5 – 15 m

Nominal sizes

  • DN250
  • DN355
  • DN500
  • DN710


  • High capacity swirl diffuser with adjustable discharge pattern
  • Adjustable swirl vanes attached to helically adjustable guide-ring provide discharge direction modulation
  • Swirl vanes with helical twist flatten vane pitch towards the periphery for increased airflow rate range of operation
  • Steep central swirl vane pitch for increased airflow capacity and reduced pressure drop
  • Substantially constant pressure from horizontal to vertical discahrge.
  • Four nominal neck sizes, each available with an optional reducer for reduced airflow.
  • Airflow rate range reduces by approximately 30% with each reduction in effective neck size.
  • Standard circular face for all sizes
  • Optional square face for sizes DN250 - DN500 suitable for ceiling grids from 300 mm up to 600 mm, depending on diffuser neck size
  • Installation freely suspended or flush with closed ceiling
  • Substantially flush face with 20 radially off-set swirl vanes
  • Similar aesthetic to HSC-FD
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Download: Selection Tool - (xls) (4/7/18)

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