The role of fire doors

Fire doors are the last protective barrier for life and property. According to the flow of people in the place, it is particularly important to choose normally open and normally closed fire doors. Improper selection will cause economic losses due to fire accidents, and will also cause danger to life, which cannot be ignored. So, what is the difference between normally open and normally closed fire doors? Beima fire door editor Amin SEO shares here:

where is the difference

To understand the difference between the two, we must first understand how normally open fire doors and normally closed fire doors work to prevent fire.

Normally open fire door

1. It is generally installed in places with large crowds, such as schools, large shopping malls, hospitals and other places. Under normal circumstances, it should be in an open state, which is convenient for people to enter and exit;

2. It is definitely inconvenient to install normally closed fire doors. Frequent opening and closing will lead to damage to normally closed fire doors, which will not play a role in fire prevention and cause fire hazards. Therefore, normally open fire doors are generally installed in these places;

3. When a fire occurs, the fire door monitor will send out an alarm signal, and at the same time let the electric door closer automatically close the fire door.

The function of the electric door closer is to automatically close the normally open fire door when it receives a signal, and at the same time feed back the signal to the fire door monitor to tell the fire door monitor that the door has been closed. The fire door monitor will not alarm after receiving the feedback signal. In this way, the normally open fire door is closed under the action of the fire door monitoring system when a fire occurs, which plays the role of preventing smoke and fire.

Normally closed fire door

1. It is generally installed in places with less crowds. It should be closed under normal circumstances and in the event of a fire. It needs to be pushed open when people move around, so as to isolate the smoke and fire and prevent the spread of the fire.

2. Some people say that since they are all closed, do you still need to install a fire door monitoring system? The answer is that it still needs to be installed. Because normally closed fire doors are not guaranteed to stay closed all the time. There are many fire accidents that have occurred at present, and there are many cases because the normally closed fire door is artificially opened, such as using a fire extinguisher or a bicycle and other objects to keep the door open.

Once the normally closed fire door is in the open state for too long, when a fire occurs, the fire will easily spread to the fire escapes such as stairwells, which does not play a role in fire prevention.

3. The magnetic switch of the fire door is actually a signal device that detects the state of the normally closed door. Therefore, when someone opens the normally closed fire door for too long, the magnetic switch will send a signal to the fire door monitor, and the fire door monitor will The police will be alerted to remind people to deal with it.

final summary

In summary, normally open fire doors and normally closed fire doors need to be selected according to different installation sites, and whether it is a normally open protective door or a normally closed fire door, the fire door monitoring system is essential, which can realize the construction of the building. Centralized management and control of fire doors in the interior to eliminate potential safety hazards caused by improper use of fire doors.