VENTILATION DUCTING SYSTEMS AND METHODS

摘要

In one preferred form of the present invention shown in Figure 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 5 provide a ring-type restrictor that is able to expand inwardly to reduce an inner channel area and provide a restriction to air flow C14o Ct)) C, oo i C14 C')/ 00C! IIC, iiY