The role of the fire door is to meet the refractory stability, insulation in a certain period of time, can prevent fire spread and spread, to ensure the evacuation of personnel, is an essential equipment in the fire work.
Fire doors must be closed for them to work, and if they are opened during a fire, they certainly lose their function. But in daily life, some set fire door position will often have personnel through, fire door will therefore be often opened, a long time is not conducive to the normal use of fire door, therefore, this kind of special place should use the often open fire door.
About always opening fire doors
Often open fire doors are generally installed in places with large flow of people, such as schools, large shopping malls, hospitals and other places. These places due to frequent access to the stairwell, if the installation of often closed fire doors must not be convenient. At the same time, if often open the fire door will lead to often closed fire door damage, so as not to play the role of fire prevention, the formation of fire hazards. Therefore these places are generally installed normally open fire doors. Often open fire doors in normal conditions in the open state, convenient for people to enter and exit. When there is a fire, it automatically shuts off by electrical control, and feedback the action signal. Often open fire door is not a simple fire door in the open state, must meet in the fire can automatically control the function of closing, so often open fire door must be set up fire alarm system with its matching.
About normally closed fire doors
Often closed fire doors are generally installed in less crowded places. Under normal conditions and in case of fire, it should be closed. When someone walks, it needs to be pushed away. In this way, it can prevent smoke and fire from spreading. For example, the evacuation stairwell of the general high-rise residential building, usually the personnel generally use the elevator and less people through the stairwell to reach the floor, so the fire door of the stairwell is often closed, even if there are personnel through the door can also be closed and sequence (double door) after the realization of the self-closing.
Regardless of the normally open or normally closed fire doors, newly built projects are generally designed fire door monitoring system to monitor the state of fire doors, through the fire door monitor set in the fire control room to grasp the real-time opening and closing state of fire doors in the building.