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目前坑探工程的手掘比重，约占总数60％左右。手掘坑道的通风问题，普遍采用自然通风、火炉通风和人工通风（手摇通风机、脚踏通风机）等。不仅通风时间长，效率低，而且井下工作条件比较恶劣。人工通风比自然通风效果有些提高，但劳动强度大，风压低，风量小，满足不了五十米以上坑道通风的要求。因此通风问题是手掘坑道急待解决的问题
At present, the proportion of hand excavation pit engineering, accounting for about 60% of the total. Hand excavation tunnel ventilation problems, the widespread use of natural ventilation, stove ventilation and artificial ventilation (hand fan, pedal ventilator) and so on. Not only ventilation for a long time, low efficiency, but also poor working conditions downhole. Artificial ventilation than the natural ventilation effect somewhat improved, but the labor-intensive, low wind pressure, small air volume, can not meet the tunnel ventilation requirements of more than 50 meters. Therefore, the ventilation problem is an urgent problem to be solved by hand excavation tunnel