Also, in some mines, the leakage that leads to spontaneous combustion can be reduced. Substituting auxiliary fans for brattice eliminates this source of resistance, with improvements in system efficiency and more ยป cost. Because it is a great distance from the fan, the resistance of the line brattice can result in more overall leakage than an equivalent resistance closer to the fan. One major source of airflow resistance is the line brattice used to direct air from the last open crosscut to the working face. As a result, changes in airflow resistance will strongly affect the efficiency with which air is delivered to the working place. Coal mine ventilation systems are often subject to high leakage rates.
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