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  • Compact design for space saving installations.
  • High efficiency operation for economics running costs.
  • Low operational noise levels and vibration free running.
  • Wide volume range and high pressure development.
  • Design for flexible applications.
  • Super quality for long life.

Introduction

VBS series are single inlet centrifugal fan with backward curved blades. These are suitable for supply or exhaust application in industrial and commercial buildings

These series are available in eighteen (18) standart nominal diameters from 200 up to 1400mm

Constructions

Impeller, The impeller has backward curved blades manufactured from mild steel finished with polyester paint finish. All impeller are statically and dynamically balanced to ISO 1940 standarts.

Casing, For all size except 1120 and above, the casing is manufactured from high quality galvanized sheet steel with the casing fixed to the side plates in lock form system. For size 1120 and above, the casing is manufactured from mild steel finished With polyester paint coating.

Frame, The frame is manufactured from galvanized angular bars, they are manufactured with sections of steel. For size 900 up to 1400, the frame finished with polyester paint finish.

Bearings, All bearings are either deep groofe ball bearings type sealed at both sides. The bearings are lubricated for life and maintenance-free. If lubrication is necessary , it is recommended to use a lithium base grease suitable for all temperatures within the operational limits.

Shaft, The shaft are C40 carbon steel using automatic process for positioning ang keyways cutting. All tolerance are 100% check to ensure precision fit.

Fan Rotation and Discharge

The direction of rotation is determined from the drive side of the fan.
[refer to the following figure]

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Motor Position

Location of the motor is determined by facing the drive side of fan and designating the position by letter W,X,Y, or Z.

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Motor selection

The following safety margin should be added to the power requirements at the fan shaft as shown by the performance curves.

The safety margin is to compensate for transmission losses of  the V-belt drive and for possible minor inaccuracies in the calculation of the system resistance.

PM = PW + SM


PM = Motor Rating [kW]

PW = Absorbed Power [kW]

SM = Safety Margin [%]

  • Up to 10kW = 15%
  • Over 10 kW = 12%