The system must remove hot process gas at the required rate while maintaining the furnace, kiln or oven pressure within the operating target.
Heat-recovery equipment, cooling sections, cyclones, dust collectors, dampers and long ducts can create substantial resistance before the gas reaches the fan.
Temperature affects gas density, fan materials, clearances, bearing protection and motor load. Dust and chemical composition also determine wear and corrosion requirements.
The fan handles elevated-temperature gas directly after the furnace or process equipment. Material strength, shaft expansion, bearing isolation and drive arrangement require detailed review.
Heat recovery, dilution air, cooling equipment or treatment systems reduce the gas temperature before the fan and may simplify the fan configuration.
The fan must maintain the required exhaust volume after losses from furnace openings, hot-gas ducts, heat exchangers, cyclones, dust collectors, dampers and the final stack are included.
Pressure resistance can change as deposits build up, filters load or dampers move. The operating point should reflect the expected production condition.
For a new project, gas generation, cooling, heat recovery, dust treatment, fan position and stack resistance should be evaluated together.
For replacement, compare the original fan duty with current process load, inlet temperature, deposits, dust wear, duct changes and motor condition.
It is a centrifugal fan used to remove hot process gas, combustion products or furnace atmosphere through ducts, treatment equipment and a stack while maintaining the required furnace pressure.
Only when the confirmed inlet temperature, dust loading, gas composition and fan configuration are suitable. Many systems cool or treat the gas before it reaches the fan.
Gas density, motor load, material strength, shaft expansion, bearing temperature and drive arrangement all change with temperature. The actual inlet temperature must be provided.
Hot ducts and fan casings expand during operation. Flexible connections, suitable supports, clearances and alignment help prevent stress and vibration.
Dust concentration, hardness and particle size must be reviewed. Cyclones, separators or dust collectors should reduce abrasive loading before the fan where possible.
Y5-47, Y5-48, Y8-39/Y9-38, G/Y4-73, GY5-51, GY6-41 and GY6-51 cover different airflow and pressure directions. Final selection depends on temperature, dust and the full resistance route.