Abstract
Airflow at the face of underground excavations is affected by damage to flexible ventilation ducts. Airflow losses due to cuts, holes, tears, and leaking through joins may result in a poor working environment and could substantially increase ventilation costs. Trials on old, damaged flexible ventilation ducts proved that installation of a plastic liner (called airliner) effectively sealed all damaged areas and prevented any leakage through joins and stitches. Additionally, the low friction factor of the airliner material improved airflow. The installation of airliners substantially increased ventilation to the development face. Installation of airliners inside leaking ducts improved ventilation without the need for duct replacement.
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