Mainly on
structure of blades
running efficiency and power consumption
noise
performance and application
maintenance
1、About difference on structure of blades
forward curved centrifugal fan: blade outlet angle is bigger than 900, blades arrangement in high density (quantity of blades is relatively big) and dimension of blades is small, which has compact structure.
2、About running efficiency and power consumption
backward curved centrifugal fan has higher efficiency than forward curved centrifugal fan since it has less airflow loss which can reach 80% to 90%.
3、About noise
forward curved centrifugal ventilation fan has high air flow which causes high speed when air impacts shell, thus its operation noise is higher than backward curved centrifugal fan.
4、About performance and application
Forward curved centrifugal fan has a higher total pressure, suitable for high-pressure and low air flow commercial air conditioning applications ;
Backward centrifugal fans are mainly used for medium pressure and high air flow which is suitable to industrial air conditioning.
5、About Maintenance
The forward fan body is smaller, butmay have scaling problem; The backward fan has relatively lower maintenance requirements.
