FIELD: mining industry; may be used in driving mine workings in underground mineral mining. SUBSTANCE: device is additionally provided with casing which has two openings. Pipe bend is rigidly secured in one of these openings, while the other opening has cover. Flow section of each opening of casing and cross-section of casing are made equal to or larger than cross-section of hole through which fresh air is supplied to casing. EFFECT: reduced material expenditures for ventilation and improved ventilation quality due to use the same holes for ventilation of working. 2 dwg
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