How does air enter the aircraft cabin?

Air enters the aircraft cabin primarily through side wall ducts located near the ceiling, in addition to grills and light fixtures, as well as through individually controlled air vents. This design allows for the efficient distribution of fresh air throughout the cabin, ensuring passenger comfort during the flight.

The system is engineered to blend outside air with recirculated cabin air, promoting optimal airflow and air quality. Side wall ducts provide a continuous supply of air across the cabin, while individual air vents allow passengers to adjust the airflow to their personal preference, enhancing the overall cabin environment.

While boarding doors do provide a pathway for air to enter temporarily, the primary ventilation system is not reliant on this method during flight. Similarly, undercarriage and floor vents serve different functions and are not the main source of cabin air supply, confirming the significance of the designated air delivery systems.