Air Distribution
The A/C Pack exhaust air is ducted into the pressurized fuselage, where it is mixed with filtered air from the recirculation fans, and fed into the "mix manifold". On nearly all modern jetliners, the airflow is approximately 50% "outside air" and 50% "filtered air."
Modern jetliners use "High Efficiency Particulate Arresting" HEPA filters, which trap >99% of all bacteria and clustered viruses.
Air from the "mix manifold" is directed to overhead distribution nozzles in the various "zones" of the aircraft. Temperature in each zone may be adjusted by adding small amounts of "Trim Air", which is low-pressure, high temperature air tapped off the A/C Pack upstream of the TCV. Air is also supplied to individual gaspers (outlet nozzles) over each passenger seat, which may be adjusted individually by passengers. Some aircraft allow gasper supply to be turned on or off from the flight deck.
Read more about this topic: Environmental Control System (aircraft)
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