US Patent 8621884 AC unit with economizer and sliding damper assembly

Embodiments of the invention provide an air conditioning unit that includes an intake vent, an exhaust vent, a return vent, a supply vent, and an economizer assembly including a sliding damper and a partition. The partition includes an opening through which air can flow from the return vent to the supply vent during a mechanical cooling mode. The sliding damper includes a vertical panel capable of moving vertically to close the intake vent and the exhaust vent during the mechanical cooling mode and an angled panel capable of closing the opening in the partition in order to enter an economizer mode.