What role do visual notification appliances serve in fire alarm systems according to NFPA 72?

In fire alarm systems, visual notification appliances play a crucial role in ensuring that individuals with hearing impairments receive timely alerts in the event of a fire emergency. According to NFPA 72, these visual devices—such as strobe lights or flashing lights—are designed specifically to convey alarm signals through visual means. This helps ensure that all occupants, regardless of their auditory capabilities, can be made aware of the emergency situation and take necessary actions to evacuate safely.

The incorporation of visual notification devices is vital in creating an inclusive environment where all individuals, including those with hearing loss, are adequately warned and can respond appropriately to the danger presented by a fire. This aspect emphasizes the importance of accessibility in fire safety systems, as well as the broader goal of protecting every occupant within a building.