What kind of door is a fire door?
You know each other well. When I go home to work, I will take a photo.
You are strangers.
Except for its name.
You may not know anything about it.
Blue Friend introduces you to an "old friend".
It's called a "fire door".
This door is usually closed
So do you understand it?
What exactly is a fire door?
A fire door is a door that can meet the requirements of fire stability, integrity and thermal insulation for a certain period of time.
In addition to the role of ordinary doors, fire doors also haveStop the fire from spreadingwithFlue gas diffusionIn the event of a fire, it can buy time for personnel to evacuate.
Fire doors followedFire resistance, which can be divided into: insulated fireproof doors (Class A), partially insulated fireproof doors (Class B) and non-insulated fireproof doors (Class C).
and belongs to category AInsulated fire doorsThe fire resistance grade is further divided into a (1.).5 hours), B (1 hour), C (0.).5 hours) three levels, the fire door leading to the evacuation staircase is generallyClass B fire door, burned60 minutesIt won't be bad.
The difference between closing the door and not closing the door
The fire door was not closed when the fire broke out.
The smoke will quickly spread to the rest of the stairs, including the stairwells.
Closed fire doors will be.
smoke and flames.
Blocked in the burning hallway.
Thus leaving an escape route.
Make sure people can escape safely
"Misunderstandings" about fire doorsFor convenience, the normally closed fire door is open all year round;
There is a pile of debris near the fire door;
Lock the fire door or change it to an anti-theft door.
For convenience, the normally closed fire door is set to open all year round
There is a pile of debris near the fire door;
Lock the fire door or change it to an anti-theft door. 
Turning a blind eye to fire doors that are not kept intact and effective
These misconceptions are in the event of a fire.
It can contribute to the spread of fire and hinder escape routes
Confession from a fire door