Sabre Sickle Fan Assisted Roof Cowls Single Phase 6 Pole 450mm

  • Swept impeller with Aerofoil blades, winglets and serrated trailing edge for optimum performance
  • Fully assembled cowl
  • Optional backdraught shutters and birdguard
  • Moulded from recyclable polymeric material, optional coloured
    units available
  • One shot die cast aluminium impeller dynamically balanced for
    smooth operation
  • All sizes resistant to UV light
  • All models speed controllable
  • Thermal Overload Protection for motor protection
  • Operating temperature up to 70°C
  • 2 Year Guarantee

Product Overview

Ventilation Type
Commercial Ventilation
Product Range
VSR (Sabre Sickle Fans Assisted Roof Cowls)

The latest generation of the Vent-Axia Sabre® Sickle Roof fans incorporate the very latest FE2 Owlett impeller offering improved performance over the previous ranges with up to 7dB(A) reduction in sound and up to 15% improvement in efficiency ensuring the best available fan performance in its class. The advanced blade design is matched to a purpose designed external rotor motor to ensure unrivalled reliability and controllability.

All cowl and roof mounting plates are moulded from specially formulated polymeric materials, which are high impact resistant and provide a rigid profile against strong winds and are resistant to UV light. Standard Colour BS00A05. Alternative colours available on request.

Suitable for flat or inclined roofs (max. angle 30°). Sabre® Sickle Roof Fans are designed for either kerb or purlin box mounting. All sizes are fitted with inlet wire guards, giving protection to BS 848 part 5. Bird guards are available as optional accessories.

Design and Development
Using a combination of NASA research into wing performance and winglets, coupled with a study of bird flight has enabled the development of the best available Sickle blade profile. Matching this to a purpose designed close fitting casing ensures best use of this blade technology thereby reducing noise and improving the performance in cased axial fans.

The impellers incorporate the latest in Sickle blade aerofoil technology to ensure minimum sound and maximum performance. The motors and impellers are factory matched, statically and dynamically balanced to ISO 1940 part 1, Quality Class G.6.3.

The external rotor motors are specifically designed and styled for this range of fan. Ball bearings are greased for life. Sizes 315 - 710 are protected to IP54, against dust and moisture complying with BS EN 60529.

They have ribbed aluminium body castings for efficient cooling with Motor insulation to Class 'F' (from -40°C to + 70°C). Speed controlled sizes 450 to 710, 6 & 8 pole motors are only suitable for operating temperatures of up to 40°C.

The Sabre® range is available for either single phase 220-240V 50 Hz capacitor start and run or three phase 380-415V 50Hz. Motors are fitted with Thermal Overload Protection which should be wired into all controller circuits and into starter contactors to prevent motor damage due to overloading / overheating. Units are suitable for speed control by either electronic, voltage reduction or frequency inverters where permissible.

Speed Control
Units are suitable for speed control by either electronic, voltage reduction or frequency inverters where permissible. For optimum efficiency and controllability Vent-Axia recommend the use of the eDemand Inverter controller to give close control via sensors or manual control.

Terminal Box
An IP54 terminal box is supplied with all models with M20 x 1.5mm gland entry offering protection against dust and water.

The fan performance, is in accordance with tests to ISO 5801.

Sound Levels
Fan sound levels, measured in a reverberant chamber in accordance with ISO 3744 Part 1. Published dB(A) figures are free field sound pressure levels at 3m with spherical propagation at a reference level of 2 x 10-5Pa (20 micro-Pascal). The sound power level spectra figures are dB with a reference level of 10-12 Watts (1 pico-watt).

To ensure minimum noise levels during speed control, either an auto transformer or eDemand inverter speed control is recommended.

Sabre® Sickle Roof fans consist of two elements, a boxed cowl assembly and a plate mounted fan. Fan & cowl are supplied separately to assist with transportation and are quickly assembled on site.

A full range of accessories is available for the Sabre®
Sickle Roof fans:
- Electronic Speed Controllers
- Auto Transformer Speed Controllers
- eDemand Inverter Speed Control
- D.O.L. Starters
- Purlin Boxes
- Backdraught Shutters
- Bird Guards
- Roof Attenuators

Product Downloads

Installation Instructions

Catalogue Pages

Other Documents


eDemand Voltage Controller Single Phase 6 Amp
  • Demand ventilation control for A/C speed controllable fans
  • Quick start-up by pre-programmed modes
  • IP54 rated
  • Total motor protection using thermistor connection
  • LCD multifunction display
  • 2 x analogue input for sensors (0-10V – separate power supply required, 0-20mA)
  • CO2 Control
  • Temperature control
  • Constant pressure control
  • Manual remote speed adjuster (0-20mA)