MODEl BHOP  
SINGLE SUCTION INTEGRALLY GEARED CENTRIFUGAL BLOWER
Capacity Control
Control of the capacity, at constant blower speed, is given by varying the angle of the inlet guide vane(IGV) placed close to the inlet of impeller.
IGV consists of the ring-shaped casing, the guide vanes, and the operating mechanism connected to pneumatic, electric, hydraulic or manual actuator.
The graph shows the performance with the inlet vane control.
 
Inlet Guide Vane