如今,各地高层建筑越来越多。这些高层建筑内部往往通道纵横交错,一旦发生火灾,火势便会顺着通道蔓延,烟雾也会四处弥漫,给人员逃生和消防员的灭火带来很大困难。这时,我们就需要一种装置,防止火势通过建筑物内部的通道蔓延,以保证消防疏散通道的安全,这种装置就是防火门。防火门的分类防火门是设在防火分区间、疏散楼梯间、垂直竖井等具有一定耐 Today, more and more high-rise buildings around the world. These high-rise buildings are often criss-crossing the interior of the channel, in the event of a fire, the fire will spread along the channel, smoke will be filled everywhere, to escape the fire and firefighters brought great difficulty. At this moment, we need a device to prevent the spread of fire through the channels inside the building to ensure the safety of fire evacuation routes. This device is a fire-proof door. Classification of fire doors Fire doors are located in the fire sub-division, evacuation stairs, vertical shafts have a certain resistance