FIELD: mining; applicable in ventilation of workings of uranium ore mines and underground nuclear power plant. SUBSTANCE: mine ventilation plant has air supply and ventilating shafts communicated with mine working, fan, switching doors, and auxiliary duct communicated with air supply shaft. Auxiliary duct has air intake located on ground surface. In this case, air supply and ventilating shafts and also air intake of auxiliary duct are located in the same vertical plane. Ventilating shaft is located between air supply shaft and air intake of auxiliary duct. EFFECT: higher degree of protection from radiation contamination of fresh air supplied to working stations. 6 dwg
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