Small squirrel cage fans, also known as centrifugal or blower fans, have become essential components in modern ventilation, heating, and cooling systems. Their unique design, compact size, and reputation for reliable airflow make them a preferred choice for residential, commercial, and industrial applications. But how energy efficient are these fans, especially when compared to other types of air movers? This comprehensive article explores the energy efficiency of small squirrel cage fans, their working principles, benefits, limitations, and practical considerations for maximizing performance.