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4 Inch Axial Mixed Flow Inline Ventilation Circular Duct Fan. Versatile Airflow Management: Supports both exhaust and intake functions for efficient indoor air circulation. Wide Power Range: Available in 35W to 280W models to suit residential and industrial needs. Multiple Certifications: Complies with RoHS, UR, ISO, CE, and CCC standards for global safety. Compact Duct Design: Inline circular design fits standard ducts with lengths from 220mm to 450mm. High Airflow Capacity: Delivers up to 49 M3/Min airflow for effective ventilation in large spaces.