Longwell Duct Fans | Power & Silence Redefined Engineered for HVAC, industrial ducts, and commercial ventilation, Longwell duct fans feature brushless motor technology with 30%+ energy efficiency. Aerodynamic design delivers up to 5000m³/h airflow for long-distance ventilation, while 25dB ultra-quiet operation and IP55 protection suit labs, cleanrooms, and critical environments. Smart speed control, remote monitoring, ensure 30000-hour durability. CE/FCC/ISO/ETL/UL certified, trusted by energy, chemical, and data center industries worldwide. #Industrialfan #Ductfans #LONGWELL