FIELD: coal industry. SUBSTANCE: extraction district is provided with reverse ventilation, i. e. , air is supplied over belt heading and discharged over vent drift, with air current guides found in breakage face. One guide is located along belt heading at junction with breakage face and bent in breakage face along caved rocks. Second guide is arranged at vent drift-breakage face junction at acute angle to face plane. EFFECT: higher efficiency. 1 dwg
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