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香港惊传疑因居民擅改座厕排气管而导致“楼上传染楼下”的新冠肺炎个案，香港管线专业学会前会长黄敬表示，排气喉的功能在于将臭气排走和平衡空气压力，市民在正常情况下都不用改动。

黄敬接受香港媒体受访时如是指出，并表示，若排气管被改动而无密封，粪渠就无法把臭气排走，有毒的空气会存在洗手间内，再开抽气扇的话，就会形成对流效果，将有毒空气扯起，增住户感染风险。

他又指，香港所有屋苑的渠道都已通过检测，排气喉建筑设计也受屋宇条例规管，而一般管道寿命是30至50年，正常情况下市民在都不用改动。

“若有市民擅自改动或胶喉老化，才会导致泄漏。”

青衣长康邨康美楼居民是于周二被怀疑自行改动座厕排气管而发生怀疑首宗“楼上传染楼下”的确诊个案，周三有当地居民在超级市场抢购消毒用品，但也有居民如常出入作息，不过，居民都戴上口罩。

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