A fire alarm system（also called apartment building fire alarm system） is intended to enable a fire to be detected at a sufficiently early stage so that people who are at risk can be made safe either by escaping from the fire, or by the fire being extinguished (also to prevent extensive property damage). Neither of these measures can be used until people are made aware of fire.
The effectiveness of the fire detection and apartment building fire alarm system depends on the stage of the fire at which it is operated. In order for all the occupants to escape without too much difficulty, an early alarm should operate before the escape routes becomes smoke-logged to such an extent as will cause occupants to have difficulty finding their way out of the building.
Fire Alarm Systems（apartment building fire alarm system） are used to protect life and property.
the fire alarm system protects by :
detecting a fire at an early stage
alerting and evacuating occupants
notifying the relevant personnel
activating auxiliary functions e.g. smoke controls, lift homing etc
identifying and guiding fire fighters