This new 6 inch inline duct fan is designed for ventilation setups that need adjustable airflow, with a listed 345CFM output and stepless speed control for more precise tuning. The low-noise design may appeal to buyers outfitting grow rooms, HVAC ducting, workshops, or other spaces where airflow and sound levels both matter. Free shipping is included, which can help when comparing total cost. If you are matching an existing system, confirm compatibility with your duct size and installation needs before purchase. This listing is best suited to shoppers looking for a new inline fan rather than a used replacement part. Check the listing for full details. 6 Inch Inline Duct Fan 345CFM Airflow with Stepless Speed Control Low Noise E.... Color: Black, Condition: New. Listed at 43.40 USD. An inline duct fan is a compact and powerful ventilation solution designed to move air efficiently through ducts and enclosed spaces. These fans are typically installed directly into the ductwork, providing a discreet and space-saving option for improving airflow.