Large squirrel cage fans are vital components in modern HVAC systems, industrial ventilation, and commercial air handling units. Their unique cylindrical design and efficient airflow capabilities make them indispensable for maintaining air quality, temperature control, and energy efficiency in large spaces. To ensure these fans operate at peak performance and enjoy a long service life, a comprehensive maintenance strategy is essential. This article provides an in-depth guide on how to maintain large squirrel cage fans for optimal performance, covering cleaning routines, inspection schedules, troubleshooting, and professional tips.