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阐述了平顶山四矿丁５６—１９０９０回采面试验下行通风的理由，方案选择，使用效果及结论。它为全矿区消除井下热害威胁、实现安全生产探索了新途径。
The reason, scheme selection, using effect and conclusion of downward ventilation of Ding 56-19090 mining face in Pingdingshan No.4 Mine are expounded. It is the whole mining area to eliminate the threat of thermal hazards underground, to explore new ways to achieve safety.