AC Infinity Window Duct Kit Adjustable Vent Port For Inline FansWindow Duct Kit, Adjustable Vent Port For Inline Fans A window vent kit designed to assist inline fans in effectively ventilating air to the outside environment. Capable of assisting exhaust and intake functions, this kit efficiently supports the removal of stale air and influx of fresh outside air. The sliding track plates effortlessly extend for vertical or horizontal installation to comfortably fit most window sizes as well as sliding doors. Built