Q Standard Energy-Efficient Tilt Circulator Fan - 24in., 7700 CFM, Model# 19282 Brushless DC motor provides cleaner, quieter operation while increasing reliability and lifespan Ultra-quiet sound output makes this fan one of the quietest in the industry DC motor also provides improved reliability and higher RPMs, saving you 20-60% on operation costs compared to AC motors Fan has high efficiency of 80-90% and runs much cooler than other motors 3-speed motor makes it easy to control your airflow