常闭式防火门是防火门分类方式的一种，比方管道（水井、电井等），绝对应的一种常开式防火门、过道门 。这只是依照开关的状况分类，差其余分类方式罢了，就像按材质 有木质 制的一样.

　　个别防火门都是常闭的，常开防火门很罕用，个别都是在通道处，装备间的门都是常闭的，就是咱们平凡所见的都是。常开的是指常常走人的防火门，要计划常开的，建造消防计划中有。

Normally closed fire door is a classification of fire doors, such as pipelines (wells, electric wells, etc.) , the corresponding to a normally open fire doors, corridor doors. It's just classified by the state of the switch, in different ways, just like it's made of wood. General fire doors are normally closed, often open fire doors rarely used, are generally in the passage, equipment between the doors are always closed, that is, we usually see are. Often open means often walk away from the fire door, to design often open, building fire design.