Twin Type
Belt Drive Centrifugal Fans
Forward Curved Blades double inlet - VFD Series

VFD series are double 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 standard nominal diameters from 200 up to 1400mm

* Impeller, the impeller has forward curved 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 manusfactured 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 bith 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 operational limits
* shaft, the shaft are C40 carbon seel using automatic process for positioning and keyways cutting. All tollerance 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)

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

VFD Series
- Compact design for spave saving installation
- High efficiency operation for economic 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

Twin type (VFD2 models)
VFD series are also available in twin fan version, with two double inlet fans mounted on the same shaft. To select for twin type, use the curves of the single fan with the following factors :
- Volume x 2
- Absorbed power x 2.15
- Speed x 1.05
- Noise +3dB
- For more information of twin type please consult the technical department for detailsDownload PDF