1.The volume of air which flows through a closed window or door in a given length of time as a result of the difference in air pressure on its opposite faces.
2.In ductwork, air which escapes from a joint, coupling, etc.
3.The undesired leakage or uncontrolled passage of air from a ventilation system.
4.The flow of uncontrolled air through cracks or openings in an enclosure within a building (such as a HVAC plenum) or through the surfaces which enclose the building.
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