Efficient Airflow: Equipped with a 0.25 HP (180W)/0.33 HP (250W)/0.5 HP (375W)/0.75 HP (560W) pure copper motor, this direct-drive fan provides an airflow of 612 CFM/1136 CFM/1616 CFM/2109 CFM. It effectively removes smoke and heat while maintaining a noise level of ≤75 dB, ensuring strong performance with minimal disturbance.