What type of devices include notification appliances?

Notification appliances are devices designed to alert individuals to an emergency situation, typically through audible or visual signals. Horns, sirens, and strobes are all examples of these types of devices, as they function to notify occupants of a building in case of fire, intrusion, or other emergencies.

Horns and sirens produce loud sounds that can attract attention and ensure people are aware of the urgent situation, while strobe lights provide a visual alert that can be particularly helpful in noisy environments or for individuals who are hearing impaired. These appliances are crucial for effective emergency communication, enabling swift evacuation or appropriate response.

Devices such as generators and transformers, or fans and vents, are mostly involved in environmental control or power supply and do not function as notification systems. Cameras and alarms may be used for surveillance and security but are not primarily aimed at alerting individuals in an emergency. Thus, horns, sirens, and strobes are the quintessential elements of notification appliances, making them the correct choice.