Longwell DC Cross-Flow Fans | Efficient, Silent & Future-Driven Years of accumulation of mechanical and electrical technologies, Longwell DC fans deliver 40% energy savings via brushless motor tech and ultra-quiet 25dB operation for medical, industrial, and smart appliances. Featuring PWM/0-10V stepless control, IP55/IP68 protection, and military-grade durability (30,000+ hours), they cover 50-2000 CFM airflow. CE/ROHS-certified, trusted by Fortune 500 for EV thermal management, smart HVAC, and industrial innovation. #Industrial fans #Silent technology #Cross - flow fans #LONGWELL