HEATING, VENTILATION AND AIR CONDITIONING UNIT

A heating, ventilation and air conditioning unit including: a case defining a first aperture arranged to receive a recirculation airflow, a second aperture arranged to receive a fresh air airflow, a third aperture arranged to evacuate air from the case, and a door configured to move between a first position, in which the first aperture is closed by the door with the second aperture being open, and a second position in which the first aperture is fully open and the second aperture is closed by the door. The first aperture is covered by a grid with a diffuser rib.