A Fire detection and alarm system is what most workplaces and public accessed buildings should have in place.
The Fire Alarm System has two primary functions depending on how it is designed, protect the life within the building & giving the occupants sufficient warning of an outbreak of fire, so they can evacuate safely and protect the building and its contents by summoning the Fire Brigade at the earliest opportunity.
A fire alarm system will only warn the occupants about the fire however it will not stop the fire.
