Biflow SB (CYL)
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The Biflow SB (CYL) is a quality range of bifurcated axial fans with a cylindrical casing, specially developed for handling more hostile air movement applications. The Biflow SB is designed so that air throughput totally by-passes the motor, keeping the motor out of the airstream in a cooler environment.

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Learn more about individual features and benefits of our products.

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The Biflow SB range of bifurcated fans as manufactured by Elta Fans Ltd.

Technical information


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SPP Features and Benefits

Features & Benefits

Higher performance

Adjustable pitch impellers mean the pitch angle of the impeller can be adjusted on site (within limits) if a commissioning problem were to occur.

Mounting arrangement.

With a single entry motor tunnel into the fan casing, the motor tunnel must be either mounted with its opening vertically upwards, or horizontal to ensure adequate motor cooling. All bifurcated axial fans are suitable for external mounting.


SB units are tested to ISO 5801:1997 (airside performance) and to BS 848 Pt 2:1985 (sound performance) meaning accurate, up to date information on performance and noise data that can be relied upon.

Material strength

SB bifurcated axial fans have a robust, heavy duty construction for added strength and durability. Fan casings are heavy gauge, sheet steel, roll formed and welded and hot dipped galvanised after fabrication to BS 729.

Quality impellers

Adjustable pitch aerofoil section impellers with blades made from high quality pressure die cast aluminium. Hubs are pressure die cast aluminium.

Cost effective

The high efficiency impellers make this a very economical method of moving high volumes of air at low to medium pressures.

Quality assurance

All units are designed and manufactured with procedures as defined in BS EN ISO 9001: 2008.

SPP Specifications


The Biflow SB Cylindrical range of Bifurcated axial fans as manufactured by Elta Fans Ltd. 46 Third Avenue, Pensnett Trading Estate, Kingswinford, West Midlands, DY6 7US, UK. Tel: +44 (0) 1384 275800 - If you need more information - Contact us.


The all metal fan casing provides a long lasting and robust construction. The units have been constructed from sheet steel with both motor and impeller mounted within the length of the unit casing. The motor is located out of the airstream in a single entry tunnel into the casing making the unit suitable for temperatures up to +200°C. All casing parts are heavy gauge mild steel sheet, roll formed and welded, then hot dip galvanised to BS EN ISO 1461:1999 after fabrication.


Adjustable pitch aerofoil impellers are provided with blades made from high quality pressure die cast aluminium (LM6), natural finish. Impellers are factory set at an angle to provide maximum performance. The hubs are manufactured from die cast aluminium alloy (LM24). Assembled impellers are to be dynamically balanced to ISO 14694 Grade G6.3.


Motors are to be foot mounted totally enclosed metric type to IP55, with sealed for life bearings, standard industrial paint finish and Class H insulation to EN 60034-5.

Quality Management

Units are to be designed and manufactured with procedures as defined in BS EN ISO 9001:2008. All SB (CYL) units are to be tested to ISO 5801:2007 (airside performance) and BS 848 Part 2:1985 (sound performance).

Typical Application

  • Kitchen Extract
  • Spray Booths
  • Hot Gas Situations
  • Corrosive Atmospheres
  • Boiler Houses
  • Heavy Industrial
  • Bell Mouth inlets (241B)

    Fits directly to the fan case flange and provides easy connection to flexible connector

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  • Impeller Guards (078C)

    Bright Zinc plated Steel or glavanised. Fix with clips & screws (included)

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  • Mounting Feet (060B)

    For free standing mounting of ducted fans

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  • Non-Return Dampers (019)

    Prevents reverse flow of air when fan not operating

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  • Flexible Connectors (Biflow)

    Fit to matching flanges to provide flexible connection

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Accessories & Wiring Data