Experiments on the air infiltration by tracer gas method and obtains the range of air infiltration rate per unit length of the crack.

采用示踪气体法对塑钢窗冷风渗透量进行了实验，得出了塑钢窗单位长度渗风量的范围。

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Emphasizes that the resistance of the pipe system and the air infiltration rate under smoke exhausting are far more than those under ventilation, so as to need a careful calculation.

强调排烟工况下管网总阻力、漏风量均远大于通风空调工况，必须严格认真地计算。

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