Air leakage
Air leakage
The short-circuiting of air from intake to return airways (through doors, stoppings, wastes, and old workings) without doing useful work in flowing around the faces. The total air leakage is usually within the range of 35% to 53% of that passing through the surface fan.
The air that escapes from compressed-air lines by leakage from joints, valves, hoses, etc