@Everyone, how much do you know about fire doors?

Fire doorsIn building fire protection

plays a very important role

What about fire doors

What do we need to understand and master?

Let us learn together today

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First

Fire door refers to a fire door within a certain period of time

Canmeet fire resistance stability, completeness Sex

Thermal insulation requirementsdoors

Usually set in

Evacuation stairwells, elevator entrances, etc.

In case of fire

Closed fire door

Canblock the spread of smoke and fire

Buy time for residents to evacuate

Ensure safe escape

Normally closed fire door

Normally closed fire doors are a type of fire doors, and fire doors usually refer to doors located in closed places such as stairways, elevator rooms, cable wells, flue ducts, etc. The function of fire doors is to It can meet fire resistance stability and heat insulation within a certain period of time, prevent the spread and spread of fire, and ensure the evacuation of personnel. It is an indispensable equipment in firefighting work.

In daily life, we usually set up prompt slogans such as \”Keep normally closed fire doors closed\” at obvious locations on normally closed fire doors.

Normally closed fire doors can only effectively block dense fire doors after a fire. In the event of the invasion of smoke and fire, within a certain period of time, fire doors have the functions of preventing fire, isolating smoke, and blocking high temperatures.

Normally open fire door

Normally open fire doors will be installed at the entrances and exits of large shopping malls and other crowded places. Normally open fire doors do not play a fire protection role when they are opened, but they are allowed to remain open. Because it has an electromagnetic release or linkage door closer, when a fire occurs It can be automatically closed to buy time for people to evacuate. Tip: Whether it is a normally open fire door or a normally closed fire door, do not block heavy objects or other objects at the door for convenience, which will affect its normal use.

The following is oneExperimental model of smoke dispersion in residential fires

Pass this experiment

You can seeThe importance of fire doors

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Fire doors are normally closed to prevent stack effect hazards

According to incomplete statistics, nearly 60% of smoke poisoning victims died in evacuation passages, corridors or even homes far away from the fire point. This is because the direction of smoke flow is the way the fire spreads, and smoke spreads very quickly.

Relevant experts pointed out that the flow speed of smoke in the vertical direction is 3~5 meters per second, which is 8~10 times the flow speed in the horizontal direction, exceeding the speed of fire spread. 5 times. Taking a 33-story building as an example, smoke passes through the building without obstruction.Passing the evacuation stairs, it can spread from the bottom to the top in about 30 seconds.

In daily life

There are a lot of people who have absolutely no Be aware of the importance of fire doors

About its cognition and behavior

There are also many misunderstandings

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\”Misunderstandings\” about fire doors

●For convenience, normally closed fire doors are kept open all year round;

●There are piles of debris near the fire door;

●Lock the fire door or convert it into a security door without permission.

These misunderstandings in the event of a fire

will encourage the spread of fire

Obstruct the escape route

If there is no fire door

or normally closed fire doors

It was opened and not closed manually

In case of fire

It is easy for a \”small fire\” to lead to a \”big disaster\”

For the safety of everyone’s lives and property

I hope everyone will improve their awareness of fire prevention

Please keep normally closed fire doors closed