VENTILATION DUCTING SYSTEMS & METHODS
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United States of America Patent
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Issued Date -
Nov 17, 2016
app pub date -
Jan 12, 2015
filing date -
Jan 12, 2014
priority date (Note) -
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Abstract
In one preferred form of the present invention shown in FIG. 2, there is provided an airflow restriction device for mining ventilation. The airflow restriction device comprises a body having an inflatable portion. The inflatable portion is inflatable to provide a ring-type restrictor that is able to expand inwardly to reduce an inner channel area and provide a restriction to air flow
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