The Hotpoint Fresh Air Vent Kit is for use with Hotpoint AHES and AHHS PTAC units. It is a vent kit that can be added to your PTAC to add a controlled amount of fresh air intake into the unit. The filtered, fresh outdoor air helps to balance the room air. The filtered fresh air helps to dilute any room odors and stuffiness that may occur. No additional duct work required, just cleaner, fresher air.