Biflow SB (CYL)

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Biflow SB (CYL) Bifurcated Cylindrical Axial Flow Fan
Elta Select Product

Quick Facts

  • 3 standard sizes from 400mm to 630mm.
  • Air volume flow rates up to 4.50 m³/s.
  • Static pressures up to 200 Pa.
  • Suitable for operating temperatures up to +200°C.
  • Available in AC.


  • Available for next day delivery with Elta Select

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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.


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.


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.


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.

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).
  • Ancillary PackAncillary Pack
  • AV MountsAV Mounts
  • Bell Mouth InletBell Mouth Inlet
  • DamperDamper
  • Flexible ConnectionsFlexible Connections
  • Impeller Side GuardImpeller Side Guard
  • Matching FlangesMatching Flanges
  • Mounting FeetMounting Feet
  • SilencerSilencer