About Air Circulation in Airplanes
Cabin air is renewed with fresh air every 2-3 minutes.
Point1.
Fresh external air constantly replaces the cabin air every 2-3 minutes.
Point2.
Modern aircraft are fitted with highly proficient air filters* keeping the cabin air clean at all times.
- High-Efficiency Particulate Air (HEPA) filters are 99.97% effective at removing virus, bacteria, and fungi measuring 0.3μm in diameter, including the Coronavirus.
Point3.
Air in a cabin flows from top to bottom and is fully renewed.
Flow of the air using HEPA filter image
- The aircraft receives external air through the engine
*The Boeing 787 uses electric compressors to feed external air directly into its air-conditioning system, rather than from the engine. - The air-conditioning system adjusts the compressed air to an appropriate temperature and supplies the clean air throughout the cabin.
- The differential pressure will push the air inside the cabin toward the belly of the aircraft and is discharged from the cabin pressure control valve.
- Increased airflow by cleaning a portion of the air flowing under the floor with a HEPA filter.
January 13, 2023
Japan Airlines