常开式防火门根据消防规范要求，在高层建筑、大型商场、地下建筑及电缆隧道内要设防烟防火分区分隔部位，前室与走廊的分隔等部位必须安装防火门，以阻止火灾时的烟火和有害气体蔓延。目前使用的防火门一般均为常闭防火门，它的常闭，给人们行走及物品的搬运带来很多不便，也 Normally open fire doors according to the requirements of fire codes, in high-rise buildings, shopping malls, underground buildings and cable tunnels to be divided into parts of the smoke and fire partitions, partitions and other anterior chamber and corridor must be installed fire doors to prevent fireworks fireworks And harmful gases spread. Currently used fire doors are normally closed fire doors, it’s normally closed, to people walking and handling of goods brought a lot of inconvenience, but also