Heating, ventilation, air-conditioning (HVAC) unit for a vehicle

An HVAC unit including: a first aperture, a second aperture and a third aperture, the first aperture and the second aperture being arranged to receive an exterior airflow, and the third aperture being arranged to receive an interior airflow; a first door; a second door, separate from the first door; and a third door; wherein the HVAC unit defines a fresh air mode when the first door is in the open position, the second door is in the open position, and the third door is in the closed position; a partial-recirculation air mode when the first door is in the open position, the second door is in the closed position, and the third door is in the partially-open position; and a recirculation air mode when the first door is in the closed position, the second door is in the closed position, and the third door is in the open position.