FIELD: mining industry. SUBSTANCE: this primarily relates to chamber mining. Method implies taking recirculating part of air from delivery stream, directing it through open underground workings and mixing with fresh air. Prior to delivery of recirculating part of air in open workings, it is subjected to purification from suspended particles directly in passage intended for delivery of initial ventilation stream at point of its conjugation with passage for taking recirculating part of air. For this purpose, inlet hole of passage for taking recirculating part of air is closed by convex partition which contains filtering members, and their frontal surface constitutes portion of guarding surface of convex partition at side of approaching to it of primary ventilation stream. EFFECT: high efficiency. 6 cl, 1 dwg
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