Which component in a fire alarm system emits sound or visual warnings to alert occupants?

In a fire alarm system, the component that emits sound or visual warnings to alert occupants is indeed the alarm notification appliance. This appliance is specifically designed to provide audible and/or visual signals to notify individuals in a building of a fire hazard. Examples of this component include bells, horns, and strobes, which are critical for ensuring that everyone in the vicinity is aware of an emergency situation and can respond accordingly.

The alarm initiation device is responsible for detecting the presence of smoke, heat, or other signs of fire and triggers the alarm, but it does not provide warnings to the occupants. The auxiliary system may include devices like fire suppression systems, but it does not directly communicate fire alerts. Meanwhile, the central station is typically a remote monitoring facility that receives signals from the fire alarm system but does not participate in notifying the building's occupants directly.