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Cabin pressurization - Wikipedia
To pressurize the cabin and meet the regulatory requirement of Kg/min (lb/min) per person, approx. 50% of the air in the cabin is recirculated and mixed with fresh air supplied from the engines (bleed air). In a typical commercial cabin air recirculation system, the air supplied into the cabin consists of approximately. Sep 30,  · The mixed air then travels through air ducts on the plane, from back to front, and to connecting ducts, where the ceiling meets the sideboard. At . Mar 14,  · When these two are at their highest level, a certain amount of this air is “bled” off to provide a supply for a number of aircraft systems. This is called “bleed air.” Depending on the aircraft type, this bleed air is then fed to the various systems — one of them being the pressurization system. Read more: How pilots prepare to land during severe storms. On most aircraft, bleed air from the .

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