• Bifurcated Case Axial Fans (BIFA) Vent-Axia
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Bifurcated Case Axial Fans (BIFA) Vent-Axia

Features & Benefits
• Sizes 250 to 1000 dia
• Motors protected to IP55
• Motor insulation Class ‘F’
• Maximum ambient temperature 200˚C
• Speed controllable via transformer or inverter (when the ambient air temperature is not higher than 60˚C)
• IP55 terminal box
• Suitable for relative humidity levels up to 95% R.H
• Manufactured to BS EN ISO 9001
• Performance tested to BS 848 parts 1, 2 and ISO 5801
• 2 Year Guarantee

Vent-Axia
Profile: Manufacturer
Headquarters: GB
Certificates: ISO 14001:2004, ISO 9001:2008
Establishment date: 1936
Guarantee: 5 years
Employees: 800
Assortment: Ventilation products, Fans, Roof fans, Air Handling Units
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Product descritipion

The Bifurcated Case Axial range of fans has been specifically developed to meet the need for an axial fan which can handle atmospheres normally detrimental to the life of the fan motor.

By isolating the motor from the system airstream, the bifurcated fan can handle a wide variety of saturated and dustladen atmospheres, heated air and hot gases.

The range has a split airway with adirect driven motor operating in ambient air within the motor compartment. They are suitable, as standard, for handling air temperatures up to +200°C.

The Bifurcated Case Axial Fan range has a number of accessories available which include: Axial Ancillary Pack, Attenuator, Wire Inlet Guard, Coupling Flanges, Mounting Feet, AV Mounts and Speed Controllers.

Motor

The motors are specially selected to operate within the motor compartment with the airstream in the duct system, at an elevated temperature.

Motors are of the B3 foot mounting type, totally enclosed and fan cooled. Being foot mounted the motors can, in the event of a failure, be readily interchanged with a comparable frame size from a wide range of manufacturers to cover temperatures of up to 200°C.

Where indicated, the motor is suitable for speed control by either an inverter or a 5-step auto transformer speed controller when the ambient air temperature is not higher than 60˚C.

Electrical

Single phase 220-240V 50 Hz supply are available in 5 sizes:-250, 315,400,450 and 500mm diameter. 250 to 400 diameter in either 2 or 4 pole versions, 500mm diameter in 4 pole. Three phase 380-440V 50Hz supply are available in eleven sizes 250, 315, 400, 450, 500, 560, 630 in either 2 or 4 pole versions (710, 800, 900 and 1000 dia are available as 4 pole).

Impellers and Casing
The aluminium alloy impellers are die cast and have an adjustable pitch which allows a wide range of air outputs to be selected. All the casings are manufactured in steel and hot dipped galvanised to BS EN ISO 1461 after fabrication. Motor mountings and fixings used in the assembly of the fan are zinc plated and passivated.

Form of Running
Bifurcated fans have arrows showing the direction of the impeller rotation and airflow. All models are Form B running.

Terminal Box
To IP55, protected against dust and water jets from any angle, allowing outside applications.

Performance
Tested to BS 848 Part 1 & 2. 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 inlet and outlet sound power level spectra figures are dB with a reference of 10–12 Watts (1 pico-watt).

Cooling
External cooling is provided by a fan mounted at the non-drive end of the motor, protected by a cover with a grid air intake. The airflow, guided by the fan cover, is directed longitudinally on the entire periphery of the motor in the channels formed by the frame ribs.

Adequate space is provided within the motor compartment to ensure a plentiful supply of cooling air. The air within the motor compartment must not exceed 40˚C. For ambients in excess of this, please consult our Technical Services Department for further information.

 

Fan Dimensions (mm) BIFA25 - BIFA50

Bifurcated Case Axial Fans (BIFA) Vent-Axia - 1

                        Approx.
Model No. Pole Phase Pitch Angle b c d e f g Weight kg
BIFA25 2&4 1&3 25-40 250 535 302 328 8 10 240 452 30
BIFA31 2&4 1&3 10-38 315 535 355 385 8 10 240 452 35
BIFA40 2&4 1&3 10-38 400 625 450 480 8 10 335 585 49
BIFA45 2&4 1&3 10-40 450 625 500 535 8 12 360 650 60
BIFA50 4 1&3 10-40 500 660 560 590 12 12 360 695 66
BIFA50 2 3 10-40 500 710 560 590 12 12 360 695 87

 

Fan Dimensions (mm) BIFA63 - BIFA100

Bifurcated Case Axial Fans (BIFA) Vent-Axia - 2

                      Approx.
Model No. Pole Phase Pitch Angle a b c d e f g Weight kg
BIFA56 2&4 3 10-40 560 800 604 644 12 12 350 80
BIFA63 2&4 3 10-40 630 790 690 728 12 12 400 106
BIFA71 4 3 10-40 710 800 754 784 16 12 435 120
BIFA80 4 3 10-40 800 880 860 890 16 12 450 155
BIFA90 4 3 10-40 900 900 970 1038 16 14 535 170
BIFA100 4 3 10-40 1000 1000 1070 1138 16 14 575 275

 

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