VIVOSUN 6 Inch Inline Duct Fan

I'm selling a VIVOSUN 6 Inch Inline Duct Fan. It features: - Removable duct ends with locking tabs for quick removal and easy maintenance - Intake Valve is easy to install - Fan Blades for strong airflow and low noise - Strong Motor for long lasting performance - Intelligent Control so you can upgrade the E12 wired fan controller to the E42A multi-device controller to realize intelligent remote automation control via APP - Backup Memory Function to remember the speed set before last shutdown