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HSC-FD - Fixed Helical Swirl Diffuser Current Range

The world's highest performing fixed vane VAV swirl diffuser

High capacity, high induction, fixed horizontal discharge swirl diffuser with extended VAV operating range, suitable for low temperature supply air (≥ 5°C) allowing turndown to approx 25% @ âˆ†Tsupply-room = -12 K. Enhanced ADPI ≥ 90% from approx. 1 L/s/m2 to approx. 15 L/s/m2.  May be mounted flush with ceiling or free-hanging.

Airflow volume rate

  • 10 – 440 L/s (36 – 1584 m³/h)

Supply temperature

  • ≥ 5°C

Nominal sizes

  • DN250
  • DN355
  • DN500

Discharge height

  • 2.4 – 4.5 m


  • Substantially flush face with 20 off-set radial vanes.
  • High capacity fixed swirl vane VAV diffuser with horizontal discharge
  • Swirl vanes with cambered leading edges reduce noise & pressure loss.
  • Swirl vanes with helical twist for reduced peripheral pitch extend VAV operating range. Patents pending.
  • Bell-mouth extends VAV operating range and provides stable horizontal discharge even with cold supply air  (≥ 5°C, with âˆ†Tsupply-room ≤ 16 K)
  • Optional reducers for reduced airflow rates.
  • Optional blanking segments for 3-way blow (270°) and 2-way blow (2x90° or 180°) discharge
  • Square (standard) or optional round face
  • Installation freely suspended or flush with closed ceiling
  • Clean Screen™ smudge minimser and sweat inhibitor optionally available (patents pending)
  • Similar aesthetic to HSC-AD
  • Perforated square screen available to cover diffuser face
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Download: Selection Tool - (xls) (4/7/18)

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