Squirrel cage fans, often called centrifugal or blower fans, are integral to modern ventilation, heating, and cooling systems. Their distinctive cylindrical design and operational versatility make them a preferred choice for both residential and industrial applications. But what exactly drives their efficiency, and how do they compare to other fan types? This comprehensive article delves into the mechanics, efficiency factors, and practical uses of squirrel cage fans, offering insights into why they remain a staple in air movement technology.