Secrets of the sky: Why you should keep the air vent on during your next flight

This air gets combined with the air outside before going through an air filtration system called HEPA (High Efficiency Particulate Air) which clears away dust and microbes before re-entering the flight.

Depending on the aircraft, each zone typically goes through this process 15 to 30 times within 1 hour. HEPA filters are pretty efficient and can remove more than 99% of the dust and microbes present inside the plane.

By turning on the vent, one can build an invisible air barrier that creates turbulence — simultaneously blocking airborne viruses and forcing them to the ground faster.

Till we meet again, safe travels! :)