Introduction

VFS series are single inlet centrifugal fan with forward curved blades.These are suitable for supply or exhaust application in industrial and commercial buildings.
These series are available in eighteen(18) standard nomial diameter from 200 up to 1400 mm.
~Constructions
Impeller, The impeller has forward curved blades manufactured from high quality galvanized sheet steel. All impeller are statically and dynamically balanced to ISO 1940 standards.
Casing, For all sizes except 1400, the casing is manufactured from high quality galvanized sheet steel with the casing fixed to the side plates in lock form system. For size 1400, 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 groove 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 and keyways cutting. All tolerance are 100% check to ensure precision fit.

Motor Selection

The folowing 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 resistence.

             Pm=Pw+Sm

           PM : Motor Rating[kW]

          PM  : Absorbed Power [kW]

          SM  : Safety Margin [%]

                 - up to 10 kW=20%

                 - Over 10 kW=15%

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