Fire doors should never be propped open (with a fire extinguisher or anything else) because it will defeat the purpose of having fire and smoke separation during a fire.
A self-closing fire door must be allowed to function properly for safety of the occupants who may need the extra time to safely escape through other exit doors.
It would be a fire-code violation to prop open a fire door, which could result in fines or other discipline.
you use fire doors for when there is fire . fire door is for stop a smoke and fire for a few minuts for get people out and firer man to come and stop fire by water for stop fire not become bigger.
how many fire doors between fire and place of safety
Fire doors at school or anywhere else are designed to limit the spread of fire and smoke during an emergency, giving the occupants more time to escape, giving firefighters an easier and safer job of finding and putting out the fire, and reducing the amount of damage caused by a fire. You can be certain that any fire door is there for a very good fire safety reason and you should NEVER block one open for convenience. All fire doors should be self-closing, whether anyone is there or not.
why a fire should never be approached unless it is safe to do so
You should never ignore it.
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the doors also, its "light MY fire"
This is largely dependant on the security and convenience needs of the building. By code, Fire doors are to be equipped with automatic closers, and if mag-locks are installed to hold them open, they are to release upon activation of the fire alarm system to allow the doors to close properly. Some fire doors are equipped with fusible-links which break when subjected to a certain temperature, and therefore allow the fire door to automatically close, with the desired effect being containing the fire. Fire doors may remain open as necessary in non-fire situations, but must be unobstructed and maintained in working order at ALL times.
why sould a fire never be approached unless it is safe to do so
Yes. In case of fire, steel or metal doors expand and get jamned(stucked)in the door frame.If any body remains inside, he is not able to escape and his life is at risk.So, fire rated doors made of wood with Calcium Cillicate boards and vermiculite should be always used for safety of exit.
fire doors will prevent fire from speeding for only a certain amount of time, they are rated for different times. basically the create a wall that will stop the fire.
Never put water on a grease fire as it can cause the fire to spread and become more dangerous.