Method of reducing dust hazard in underground workings.

摘要

1. The method of reducing dust hazard applies to underground workings, which are fed with air by means of a ventilating duct, equipped with an axial ventilator. Characterized in that: The dust-polluted air goes through at least two multi-layered filters (4) made of unwoven cloth and positioned in the ventilating duct (3) before and after the axial ventilator (3).