Squirrel cage fans, also widely recognized as centrifugal blower fans, are essential components in today’s ventilation, heating, cooling, and industrial systems. Their unique design and operational efficiency have made them indispensable across a vast array of applications, from residential HVAC systems to large-scale industrial manufacturing processes. This comprehensive article explores what squirrel cage fans are, how they work, their advantages and limitations, and their diverse uses across various industries.