(Gıda) In military tactics, extraction (also exfiltration or exfil), is the process of removing personnel when it is considered imperative that they be immediately relocated out of a hostile environment and taken to a secure area
Exfiltration is uncontrolled outward air leakage from inside a building, including leakage through cracks and interstices, around windows and doors, and through any other exterior partition or duct penetration
The uncontrolled outward air leakage through cracks and interstices in any building element and around windows and doors of a building caused by the pressure effects of wind and/or the effect of differences in the indoor and outdoor air density