The water drops can corrode the wind hole as well as the equipments in the draught so as to reduce the lifespan of them.The shortcomings mentioned above can also bring some other bad influences.

• 这种现象本是不应出现的，水滴会使风道锈蚀，也会使风口处的设备锈蚀，减少了风道及设备的寿命，在这些缺点的背后，还带来了其他的影响。