The 4-68 series low-noise centrifugal fan is designed for general ventilation and exhaust applications where noise reduction is important. Key features: low noise design, high efficiency impeller, multiple housing sizes from No.2.8 to No.20, suitable for dust-laden air. Specifications: airflow 1,130~210,000 m3/h; pressure 167~2,050 Pa; motor power 0.55~90 kW; material carbon steel / stainless steel. Applications: workshops, commercial buildings, environmental protection systems, exhaust systems. Certifications: CCC, CE, ISO 9001, ATEX (optional). MOQ 1 unit, lead time 15-30 working days, warranty 18 months, OEM/ODM available.