Development and application of u - shaped gas passage in fully mechanized face 型瓦斯通道的研究与应用
2.
Exhaust gas passage with variable pressure : it is adopted to prevent foul air from toilet and kitchen ; check valve is added at the joint 变压式排风:为防止卫生间、厨房排风井内的污风反窜到室内,排风道采用了变压式排气道,并在封到接口处增设了止回阀。