CUD Series In-line Fan

  • The Vortair® Series of In-Line Fans is designed for a wide range of duct mounted applications.
  • Their innovative high performance mixed flow impeller produces powerful airflows without generating high noise levels.
  • They feature a heavy-duty galvanised steel circular fan casing that can be retrofitted into axial fan installations that may require greater static pressure.
  • They are available in various speed options and 6 case sizes with diameters ranging from 400 to 710mm (250 to 450mm impeller diameters).

Typical Applications

  • Commercial and industrial supply or exhaust air applications such as shopping centres, office buildings, exhibition centres, hotels, health centres, schools and universities.


  • Innovative mixed flow impeller with high performance blade geometry.
  • Heavy duty galvanised steel construction.
  • Can be retrofitted into standard 400 to 710mm axial fan installations.
  • Large choice of speeds available.
  • Can be mounted in any position.
  • A range of matched ancillaries is also available.


  • Mixed-Flow impellers are made from high performance injection moulded composite plastic material.
  • Casing made from heavy duty galvanised steel.


  • Type - can be supplied with standard direct-drive TEFC/TEAO motors. 
  • Electricity supply - single or three-phase to suit a wide range of voltages and frequencies.
  • Air flow tests based on ISO5801: 2007 Noise tests based on ISO13347: Part 3, 2004

  Wiring Diagram

  • See pages N-8, diagrams ER1, 2, 3, 4, 5 for external rotor motors and N-6/7, diagrams DD1, 2, 3, 7, 9 for standard direct-drive TEFC/TEAO motors.

  Suggested Specification

  • The duct mounted fans shall be of the Vortair® Mixed-Flow Series as designed and manufactured by Elta Pty. Ltd. and be of the model numbers shown on the schedule/drawings.
  • They shall include a heavy-duty galvanised steel circular fan casing.
  • Impellers shall be made from high performance injection moulded composite plastic material and driven by external rotor or standard direct-drive TEFC/TEAO motors as nominated.
  • All performance data shall be for a complete assembled unit based on ISO5801: 2007 for air flow and ISO13347: Part 3, 2004 for noise.


  Diminesions, mm App. wt. App. vol.
Model CUD CUE B C D E* IMPØ F G Kg# m3
354 350 375 8 395 400 250 225 350 35 0.12
404 400 485 8 450 400 250 250 400 41 0.14
454 450 535 8 500 400 315 280 450 43 0.17
504 500 585 12 560 400 355 315 500 45 0.20
506 500 585 12 560 400 355 315 500 45 0.26
8564 500 585 12 560 400 400 355 500 45 0.14
566 560 645 12 620 400 400 355 560 51 0.24
634 630 715 12 690 500 450 400 630 57 0.38
636 630 715 12 690 500 450 400 630 57 0.38

*Fan with direct-drive - DD

** Fan with external rotor motor - ER

# Weight and volume for fan with direct-drive motor only except where there is only external rotor motors available.


  • Performance curves shown are based on nominal speeds.
  • As motor speeds may vary from one manufacturer to another, and from one motor type to another, it is possible actual fan speeds may differ and, therefore, the performance of the fan.
  • For Direct-Drive performance refer to Fans by Fantech Selection Program.



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