There are many different kinds of fire doors and not all of them are tied to the alarm system. Some fire doors will only close when there is enough heat to sever a fusible link. However, as a general rule, automatically closing fire doors that are latched open with electrical controls would release the latch and close the relevant fire doors upon triggering of the fire alarm by any initiating device.
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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.
Increase sealing efficiency.
For an answer to this question you would probably need to research your local fire codes. My best advice would be to simply stop by your local fire department and ask one of the fire dept. supervisors - they would probably know the answer.
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Automatic door systems and the fire alarm systems are linked together. Automatic doors are held open by strong magnetic type devices, that are activated(turned on) during normal activity. When the alarm is activated, the devices are shut off and the doors close. These doors are programmed to close in an effort to keep smoke and flames from spreading too far(these doors are usually strongly fire resistant.) Once the alarm is shut off/reset, the devices will be activated again and will remain open once somebody opens the doors back up. Another type of "automatic door" is a fire door that slams shut (springs, counterbalances, gravity, etc) when the heat-sensitive link melts, or when a fire alarm is activated. These heavy doors are NOT intended to be opened during a fire for means of escape, so there must be other doors accessible for people to escape the area safely.
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.
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.
fire doors are normally found in a public building between certain sections of the building