Centrifugal fan
（重定向自Centrifugal Fans）
![A typical backward-curved centrifugal fan, where the blades curve away from the direction they rotate in](/Images/godic/202501/03/Centrifugal_fan0141.gif")
![Figure 1: Components of a centrifugal fan](/Images/godic/202501/03/CentrifugalFan0141.png")
![Figure 3: Centrifugal fan blades](/Images/godic/202501/03/CentrifugalFanBlades0141.png")
![Velocity triangle for forward facing blade](/Images/godic/202501/03/Velocity_Triangle_for_Forward_Facing_Blade0141.png")
A centrifugal fan is a mechanical device for moving air or other gases. The terms "blower" and "squirrel cage fan" (because it looks like a hamster wheel) are frequently used as synonyms. These fans increase the speed of air stream with the rotating impellers.