A practical guide to mass notification system (MNS) design — what NFPA 72 Chapter 24 requires, how MNS differs from standard fire alarm notification, voice intelligibility testing, and how to integrate MNS with existing fire alarm systems.
A mass notification system (MNS) — formally called an Emergency Communication System (ECS) in NFPA 72 — is a system designed to deliver real-time information and instructions to building occupants or outdoor populations during any emergency, not just fire. An MNS can communicate evacuation orders, shelter-in-place instructions, active threat alerts, severe weather warnings, and all-clear notifications using voice, text, visual signals, or a combination.
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