A fire alarm system is designed to distinguish the unwanted occurrence of fire by checking environmental changes linked with combustion. In general, a fire alarm system is classified as either manually actuated, automatically actuated, or both. Fire alarm systems are intended to give notice the building occupants to evacuate in the occurrence of fire or other emergencies, report the event to an off-premises location in order to call emergency services, and to prepare the structure and associated systems to control the spread of smoke and fire.